Compare commits
11 Commits
mvvm-readm
...
all-contri
| Author | SHA1 | Date | |
|---|---|---|---|
| bea39206ed | |||
| c3228fd6d2 | |||
| af0ccdc6e1 | |||
| 323dd63e66 | |||
| be3250bd0d | |||
| 1222f12b99 | |||
| 965d38f139 | |||
| eb8f9db575 | |||
| 6d7084f18d | |||
| 74f5cfa670 | |||
| b525d871b4 |
@ -1132,7 +1132,8 @@
|
||||
"profile": "http://subho.xyz",
|
||||
"contributions": [
|
||||
"code",
|
||||
"review"
|
||||
"review",
|
||||
"maintenance"
|
||||
]
|
||||
},
|
||||
{
|
||||
@ -1440,6 +1441,25 @@
|
||||
"contributions": [
|
||||
"doc"
|
||||
]
|
||||
},
|
||||
{
|
||||
"login": "jinishavora",
|
||||
"name": "jinishavora",
|
||||
"avatar_url": "https://avatars.githubusercontent.com/u/40777762?v=4",
|
||||
"profile": "https://www.linkedin.com/in/jinisha-vora",
|
||||
"contributions": [
|
||||
"review",
|
||||
"code"
|
||||
]
|
||||
},
|
||||
{
|
||||
"login": "eas5",
|
||||
"name": "Elvys Soares",
|
||||
"avatar_url": "https://avatars.githubusercontent.com/u/50836521?v=4",
|
||||
"profile": "https://github.com/eas5",
|
||||
"contributions": [
|
||||
"code"
|
||||
]
|
||||
}
|
||||
],
|
||||
"contributorsPerLine": 4,
|
||||
|
||||
1
.github/workflows/maven-ci.yml
vendored
1
.github/workflows/maven-ci.yml
vendored
@ -49,6 +49,7 @@ jobs:
|
||||
uses: actions/setup-java@master
|
||||
with:
|
||||
java-version: 11
|
||||
distribution: 'adopt'
|
||||
|
||||
- name: Cache SonarCloud packages
|
||||
uses: actions/cache@master
|
||||
|
||||
3
.github/workflows/maven-pr-builder.yml
vendored
3
.github/workflows/maven-pr-builder.yml
vendored
@ -29,7 +29,7 @@ name: Java PR Builder
|
||||
on:
|
||||
pull_request:
|
||||
branches: [ master ]
|
||||
types: [ opened, reopened, synchronize, labeled, unlabeled ]
|
||||
types: [ opened, reopened, synchronize ]
|
||||
|
||||
jobs:
|
||||
build:
|
||||
@ -44,6 +44,7 @@ jobs:
|
||||
uses: actions/setup-java@master
|
||||
with:
|
||||
java-version: 11
|
||||
distribution: 'adopt'
|
||||
|
||||
- name: Cache Maven Dependecies
|
||||
uses: actions/cache@master
|
||||
|
||||
@ -10,7 +10,7 @@
|
||||
[](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
|
||||
[](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
||||
<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
|
||||
[](#contributors-)
|
||||
[](#contributors-)
|
||||
<!-- ALL-CONTRIBUTORS-BADGE:END -->
|
||||
|
||||
<br/>
|
||||
@ -259,7 +259,7 @@ This project is licensed under the terms of the MIT license.
|
||||
<td align="center"><a href="https://www.linkedin.com/in/ashish-trivedi-218379135/"><img src="https://avatars3.githubusercontent.com/u/23194128?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ashish Trivedi</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ashishtrivedi16" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://rayyounghong.com"><img src="https://avatars1.githubusercontent.com/u/41055099?v=4?s=100" width="100px;" alt=""/><br /><sub><b>洪月阳</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=RayYH" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://xdvrx1.github.io/"><img src="https://avatars0.githubusercontent.com/u/47092464?v=4?s=100" width="100px;" alt=""/><br /><sub><b>xdvrx1</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Axdvrx1" title="Reviewed Pull Requests">👀</a> <a href="#ideas-xdvrx1" title="Ideas, Planning, & Feedback">🤔</a></td>
|
||||
<td align="center"><a href="http://subho.xyz"><img src="https://avatars0.githubusercontent.com/u/13291222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Subhrodip Mohanta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ohbus" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aohbus" title="Reviewed Pull Requests">👀</a></td>
|
||||
<td align="center"><a href="http://subho.xyz"><img src="https://avatars0.githubusercontent.com/u/13291222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Subhrodip Mohanta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ohbus" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aohbus" title="Reviewed Pull Requests">👀</a> <a href="#maintenance-ohbus" title="Maintenance">🚧</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center"><a href="https://github.com/nahteb"><img src="https://avatars3.githubusercontent.com/u/13121570?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Bethan Palmer</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=nahteb" title="Code">💻</a></td>
|
||||
@ -312,6 +312,8 @@ This project is licensed under the terms of the MIT license.
|
||||
<tr>
|
||||
<td align="center"><a href="https://github.com/noamgrinch"><img src="https://avatars.githubusercontent.com/u/31648669?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Noam Greenshtain</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=noamgrinch" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://xuyonghong.cn/"><img src="https://avatars.githubusercontent.com/u/14086462?v=4?s=100" width="100px;" alt=""/><br /><sub><b>yonghong Xu</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qfxl" title="Documentation">📖</a></td>
|
||||
<td align="center"><a href="https://www.linkedin.com/in/jinisha-vora"><img src="https://avatars.githubusercontent.com/u/40777762?v=4?s=100" width="100px;" alt=""/><br /><sub><b>jinishavora</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Ajinishavora" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=jinishavora" title="Code">💻</a></td>
|
||||
<td align="center"><a href="https://github.com/eas5"><img src="https://avatars.githubusercontent.com/u/50836521?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Elvys Soares</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=eas5" title="Code">💻</a></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>abstract-document</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>abstract-factory</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>active-object</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>acyclic-visitor</artifactId>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>adapter</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>aggregator-microservices</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>aggregator-service</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>aggregator-microservices</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>aggregator-microservices</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>inventory-microservice</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>aggregator-microservices</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>ambassador</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>api-gateway</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>api-gateway-service</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>api-gateway</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>image-microservice</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
<artifactId>api-gateway</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>api-gateway</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>async-method-invocation</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>bridge</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>builder</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>business-delegate</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -10,20 +10,326 @@ tags:
|
||||
---
|
||||
|
||||
## Intent
|
||||
To avoid expensive re-acquisition of resources by not releasing
|
||||
the resources immediately after their use. The resources retain their identity, are kept in some
|
||||
fast-access storage, and are re-used to avoid having to acquire them again.
|
||||
|
||||
The caching pattern avoids expensive re-acquisition of resources by not releasing them immediately
|
||||
after use. The resources retain their identity, are kept in some fast-access storage, and are
|
||||
re-used to avoid having to acquire them again.
|
||||
|
||||
## Explanation
|
||||
|
||||
Real world example
|
||||
|
||||
> A team is working on a website that provides new homes for abandoned cats. People can post their
|
||||
> cats on the website after registering, but all the new posts require approval from one of the
|
||||
> site moderators. The user accounts of the site moderators contain a specific flag and the data
|
||||
> is stored in a MongoDB database. Checking for the moderator flag each time a post is viewed
|
||||
> becomes expensive and it's a good idea to utilize caching here.
|
||||
|
||||
In plain words
|
||||
|
||||
> Caching pattern keeps frequently needed data in fast-access storage to improve performance.
|
||||
|
||||
Wikipedia says:
|
||||
|
||||
> In computing, a cache is a hardware or software component that stores data so that future
|
||||
> requests for that data can be served faster; the data stored in a cache might be the result of
|
||||
> an earlier computation or a copy of data stored elsewhere. A cache hit occurs when the requested
|
||||
> data can be found in a cache, while a cache miss occurs when it cannot. Cache hits are served by
|
||||
> reading data from the cache, which is faster than recomputing a result or reading from a slower
|
||||
> data store; thus, the more requests that can be served from the cache, the faster the system
|
||||
> performs.
|
||||
|
||||
**Programmatic Example**
|
||||
|
||||
Let's first look at the data layer of our application. The interesting classes are `UserAccount`
|
||||
which is a simple Java object containing the user account details, and `DbManager` which handles
|
||||
reading and writing of these objects to/from MongoDB database.
|
||||
|
||||
```java
|
||||
@Setter
|
||||
@Getter
|
||||
@AllArgsConstructor
|
||||
@ToString
|
||||
public class UserAccount {
|
||||
private String userId;
|
||||
private String userName;
|
||||
private String additionalInfo;
|
||||
}
|
||||
|
||||
@Slf4j
|
||||
public final class DbManager {
|
||||
|
||||
private static MongoClient mongoClient;
|
||||
private static MongoDatabase db;
|
||||
|
||||
private DbManager() { /*...*/ }
|
||||
|
||||
public static void createVirtualDb() { /*...*/ }
|
||||
|
||||
public static void connect() throws ParseException { /*...*/ }
|
||||
|
||||
public static UserAccount readFromDb(String userId) { /*...*/ }
|
||||
|
||||
public static void writeToDb(UserAccount userAccount) { /*...*/ }
|
||||
|
||||
public static void updateDb(UserAccount userAccount) { /*...*/ }
|
||||
|
||||
public static void upsertDb(UserAccount userAccount) { /*...*/ }
|
||||
}
|
||||
```
|
||||
|
||||
In the example, we are demonstrating various different caching policies
|
||||
|
||||
* Write-through writes data to the cache and DB in a single transaction
|
||||
* Write-around writes data immediately into the DB instead of the cache
|
||||
* Write-behind writes data into the cache initially whilst the data is only written into the DB
|
||||
when the cache is full
|
||||
* Cache-aside pushes the responsibility of keeping the data synchronized in both data sources to
|
||||
the application itself
|
||||
* Read-through strategy is also included in the aforementioned strategies and it returns data from
|
||||
the cache to the caller if it exists, otherwise queries from DB and stores it into the cache for
|
||||
future use.
|
||||
|
||||
The cache implementation in `LruCache` is a hash table accompanied by a doubly
|
||||
linked-list. The linked-list helps in capturing and maintaining the LRU data in the cache. When
|
||||
data is queried (from the cache), added (to the cache), or updated, the data is moved to the front
|
||||
of the list to depict itself as the most-recently-used data. The LRU data is always at the end of
|
||||
the list.
|
||||
|
||||
```java
|
||||
@Slf4j
|
||||
public class LruCache {
|
||||
|
||||
static class Node {
|
||||
String userId;
|
||||
UserAccount userAccount;
|
||||
Node previous;
|
||||
Node next;
|
||||
|
||||
public Node(String userId, UserAccount userAccount) {
|
||||
this.userId = userId;
|
||||
this.userAccount = userAccount;
|
||||
}
|
||||
}
|
||||
|
||||
/* ... omitted details ... */
|
||||
|
||||
public LruCache(int capacity) {
|
||||
this.capacity = capacity;
|
||||
}
|
||||
|
||||
public UserAccount get(String userId) {
|
||||
if (cache.containsKey(userId)) {
|
||||
var node = cache.get(userId);
|
||||
remove(node);
|
||||
setHead(node);
|
||||
return node.userAccount;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
public void set(String userId, UserAccount userAccount) {
|
||||
if (cache.containsKey(userId)) {
|
||||
var old = cache.get(userId);
|
||||
old.userAccount = userAccount;
|
||||
remove(old);
|
||||
setHead(old);
|
||||
} else {
|
||||
var newNode = new Node(userId, userAccount);
|
||||
if (cache.size() >= capacity) {
|
||||
LOGGER.info("# Cache is FULL! Removing {} from cache...", end.userId);
|
||||
cache.remove(end.userId); // remove LRU data from cache.
|
||||
remove(end);
|
||||
setHead(newNode);
|
||||
} else {
|
||||
setHead(newNode);
|
||||
}
|
||||
cache.put(userId, newNode);
|
||||
}
|
||||
}
|
||||
|
||||
public boolean contains(String userId) {
|
||||
return cache.containsKey(userId);
|
||||
}
|
||||
|
||||
public void remove(Node node) { /* ... */ }
|
||||
public void setHead(Node node) { /* ... */ }
|
||||
public void invalidate(String userId) { /* ... */ }
|
||||
public boolean isFull() { /* ... */ }
|
||||
public UserAccount getLruData() { /* ... */ }
|
||||
public void clear() { /* ... */ }
|
||||
public List<UserAccount> getCacheDataInListForm() { /* ... */ }
|
||||
public void setCapacity(int newCapacity) { /* ... */ }
|
||||
}
|
||||
```
|
||||
|
||||
The next layer we are going to look at is `CacheStore` which implements the different caching
|
||||
strategies.
|
||||
|
||||
```java
|
||||
@Slf4j
|
||||
public class CacheStore {
|
||||
|
||||
private static LruCache cache;
|
||||
|
||||
/* ... details omitted ... */
|
||||
|
||||
public static UserAccount readThrough(String userId) {
|
||||
if (cache.contains(userId)) {
|
||||
LOGGER.info("# Cache Hit!");
|
||||
return cache.get(userId);
|
||||
}
|
||||
LOGGER.info("# Cache Miss!");
|
||||
UserAccount userAccount = DbManager.readFromDb(userId);
|
||||
cache.set(userId, userAccount);
|
||||
return userAccount;
|
||||
}
|
||||
|
||||
public static void writeThrough(UserAccount userAccount) {
|
||||
if (cache.contains(userAccount.getUserId())) {
|
||||
DbManager.updateDb(userAccount);
|
||||
} else {
|
||||
DbManager.writeToDb(userAccount);
|
||||
}
|
||||
cache.set(userAccount.getUserId(), userAccount);
|
||||
}
|
||||
|
||||
public static void clearCache() {
|
||||
if (cache != null) {
|
||||
cache.clear();
|
||||
}
|
||||
}
|
||||
|
||||
public static void flushCache() {
|
||||
LOGGER.info("# flushCache...");
|
||||
Optional.ofNullable(cache)
|
||||
.map(LruCache::getCacheDataInListForm)
|
||||
.orElse(List.of())
|
||||
.forEach(DbManager::updateDb);
|
||||
}
|
||||
|
||||
/* ... omitted the implementation of other caching strategies ... */
|
||||
|
||||
}
|
||||
```
|
||||
|
||||
`AppManager` helps to bridge the gap in communication between the main class and the application's
|
||||
back-end. DB connection is initialized through this class. The chosen caching strategy/policy is
|
||||
also initialized here. Before the cache can be used, the size of the cache has to be set. Depending
|
||||
on the chosen caching policy, `AppManager` will call the appropriate function in the `CacheStore`
|
||||
class.
|
||||
|
||||
```java
|
||||
@Slf4j
|
||||
public final class AppManager {
|
||||
|
||||
private static CachingPolicy cachingPolicy;
|
||||
|
||||
private AppManager() {
|
||||
}
|
||||
|
||||
public static void initDb(boolean useMongoDb) { /* ... */ }
|
||||
|
||||
public static void initCachingPolicy(CachingPolicy policy) { /* ... */ }
|
||||
|
||||
public static void initCacheCapacity(int capacity) { /* ... */ }
|
||||
|
||||
public static UserAccount find(String userId) {
|
||||
if (cachingPolicy == CachingPolicy.THROUGH || cachingPolicy == CachingPolicy.AROUND) {
|
||||
return CacheStore.readThrough(userId);
|
||||
} else if (cachingPolicy == CachingPolicy.BEHIND) {
|
||||
return CacheStore.readThroughWithWriteBackPolicy(userId);
|
||||
} else if (cachingPolicy == CachingPolicy.ASIDE) {
|
||||
return findAside(userId);
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
public static void save(UserAccount userAccount) {
|
||||
if (cachingPolicy == CachingPolicy.THROUGH) {
|
||||
CacheStore.writeThrough(userAccount);
|
||||
} else if (cachingPolicy == CachingPolicy.AROUND) {
|
||||
CacheStore.writeAround(userAccount);
|
||||
} else if (cachingPolicy == CachingPolicy.BEHIND) {
|
||||
CacheStore.writeBehind(userAccount);
|
||||
} else if (cachingPolicy == CachingPolicy.ASIDE) {
|
||||
saveAside(userAccount);
|
||||
}
|
||||
}
|
||||
|
||||
public static String printCacheContent() {
|
||||
return CacheStore.print();
|
||||
}
|
||||
|
||||
/* ... details omitted ... */
|
||||
}
|
||||
```
|
||||
|
||||
Here is what we do in the main class of the application.
|
||||
|
||||
```java
|
||||
@Slf4j
|
||||
public class App {
|
||||
|
||||
public static void main(String[] args) {
|
||||
AppManager.initDb(false);
|
||||
AppManager.initCacheCapacity(3);
|
||||
var app = new App();
|
||||
app.useReadAndWriteThroughStrategy();
|
||||
app.useReadThroughAndWriteAroundStrategy();
|
||||
app.useReadThroughAndWriteBehindStrategy();
|
||||
app.useCacheAsideStategy();
|
||||
}
|
||||
|
||||
public void useReadAndWriteThroughStrategy() {
|
||||
LOGGER.info("# CachingPolicy.THROUGH");
|
||||
AppManager.initCachingPolicy(CachingPolicy.THROUGH);
|
||||
var userAccount1 = new UserAccount("001", "John", "He is a boy.");
|
||||
AppManager.save(userAccount1);
|
||||
LOGGER.info(AppManager.printCacheContent());
|
||||
AppManager.find("001");
|
||||
AppManager.find("001");
|
||||
}
|
||||
|
||||
public void useReadThroughAndWriteAroundStrategy() { /* ... */ }
|
||||
|
||||
public void useReadThroughAndWriteBehindStrategy() { /* ... */ }
|
||||
|
||||
public void useCacheAsideStategy() { /* ... */ }
|
||||
}
|
||||
```
|
||||
|
||||
Finally, here is some of the console output from the program.
|
||||
|
||||
```
|
||||
12:32:53.845 [main] INFO com.iluwatar.caching.App - # CachingPolicy.THROUGH
|
||||
12:32:53.900 [main] INFO com.iluwatar.caching.App -
|
||||
--CACHE CONTENT--
|
||||
UserAccount(userId=001, userName=John, additionalInfo=He is a boy.)
|
||||
----
|
||||
```
|
||||
|
||||
## Class diagram
|
||||
|
||||
|
||||
|
||||
## Applicability
|
||||
|
||||
Use the Caching pattern(s) when
|
||||
|
||||
* Repetitious acquisition, initialization, and release of the same resource causes unnecessary performance overhead.
|
||||
* Repetitious acquisition, initialization, and release of the same resource cause unnecessary
|
||||
performance overhead.
|
||||
|
||||
## Related patterns
|
||||
|
||||
* [Proxy](https://java-design-patterns.com/patterns/proxy/)
|
||||
|
||||
## Credits
|
||||
|
||||
* [Write-through, write-around, write-back: Cache explained](http://www.computerweekly.com/feature/Write-through-write-around-write-back-Cache-explained)
|
||||
* [Read-Through, Write-Through, Write-Behind, and Refresh-Ahead Caching](https://docs.oracle.com/cd/E15357_01/coh.360/e15723/cache_rtwtwbra.htm#COHDG5177)
|
||||
* [Cache-Aside pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/cache-aside)
|
||||
* [Java EE 8 High Performance: Master techniques such as memory optimization, caching, concurrency, and multithreading to achieve maximum performance from your enterprise applications](https://www.amazon.com/gp/product/178847306X/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=178847306X&linkId=e948720055599f248cdac47da9125ff4)
|
||||
* [Java Performance: In-Depth Advice for Tuning and Programming Java 8, 11, and Beyond](https://www.amazon.com/gp/product/1492056111/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=1492056111&linkId=7e553581559b9ec04221259e52004b08)
|
||||
* [Effective Java](https://www.amazon.com/gp/product/B078H61SCH/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=B078H61SCH&linkId=f06607a0b48c76541ef19c5b8b9e7882)
|
||||
* [Java Performance: The Definitive Guide: Getting the Most Out of Your Code](https://www.amazon.com/gp/product/1449358454/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=1449358454&linkId=475c18363e350630cc0b39ab681b2687)
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>caching</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -25,6 +25,7 @@ package com.iluwatar.caching;
|
||||
|
||||
import java.text.ParseException;
|
||||
import java.util.Optional;
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
|
||||
/**
|
||||
* AppManager helps to bridge the gap in communication between the main class and the application's
|
||||
@ -33,6 +34,7 @@ import java.util.Optional;
|
||||
* Depending on the chosen caching policy, AppManager will call the appropriate function in the
|
||||
* CacheStore class.
|
||||
*/
|
||||
@Slf4j
|
||||
public final class AppManager {
|
||||
|
||||
private static CachingPolicy cachingPolicy;
|
||||
@ -50,7 +52,7 @@ public final class AppManager {
|
||||
try {
|
||||
DbManager.connect();
|
||||
} catch (ParseException e) {
|
||||
e.printStackTrace();
|
||||
LOGGER.error("Error connecting to MongoDB", e);
|
||||
}
|
||||
} else {
|
||||
DbManager.createVirtualDb();
|
||||
|
||||
@ -30,6 +30,7 @@ import com.mongodb.client.model.UpdateOptions;
|
||||
import java.text.ParseException;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
import org.bson.Document;
|
||||
|
||||
/**
|
||||
@ -41,6 +42,7 @@ import org.bson.Document;
|
||||
* underlying data storage (connect()) or a simple Java data structure to (temporarily) store the
|
||||
* data/objects during runtime (createVirtualDB()).</p>
|
||||
*/
|
||||
@Slf4j
|
||||
public final class DbManager {
|
||||
|
||||
private static MongoClient mongoClient;
|
||||
@ -83,7 +85,7 @@ public final class DbManager {
|
||||
try {
|
||||
connect();
|
||||
} catch (ParseException e) {
|
||||
e.printStackTrace();
|
||||
LOGGER.error("Error connecting to MongoDB", e);
|
||||
}
|
||||
}
|
||||
var iterable = db
|
||||
@ -110,7 +112,7 @@ public final class DbManager {
|
||||
try {
|
||||
connect();
|
||||
} catch (ParseException e) {
|
||||
e.printStackTrace();
|
||||
LOGGER.error("Error connecting to MongoDB", e);
|
||||
}
|
||||
}
|
||||
db.getCollection(CachingConstants.USER_ACCOUNT).insertOne(
|
||||
@ -132,7 +134,7 @@ public final class DbManager {
|
||||
try {
|
||||
connect();
|
||||
} catch (ParseException e) {
|
||||
e.printStackTrace();
|
||||
LOGGER.error("Error connecting to MongoDB", e);
|
||||
}
|
||||
}
|
||||
db.getCollection(CachingConstants.USER_ACCOUNT).updateOne(
|
||||
@ -153,7 +155,7 @@ public final class DbManager {
|
||||
try {
|
||||
connect();
|
||||
} catch (ParseException e) {
|
||||
e.printStackTrace();
|
||||
LOGGER.error("Error connecting to MongoDB", e);
|
||||
}
|
||||
}
|
||||
db.getCollection(CachingConstants.USER_ACCOUNT).updateOne(
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>callback</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>chain</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -27,7 +27,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>circuit-breaker</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -27,7 +27,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>collection-pipeline</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>combinator</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>command</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -27,7 +27,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>commander</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>composite</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>converter</artifactId>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>cqrs</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>dao</artifactId>
|
||||
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>data-bus</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>data-locality</artifactId>
|
||||
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>data-mapper</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>data-transfer-object</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>decorator</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>dependency-injection</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,10 +29,10 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>dirty-flag</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
<name>dirty-flag</name>
|
||||
<url>http://maven.apache.org</url>
|
||||
<properties>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -27,7 +27,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>double-checked-locking</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>double-dispatch</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>eip-message-channel</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>eip-publish-subscribe</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<dependencies>
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>event-aggregator</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>event-asynchronous</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>event-driven-architecture</artifactId>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>event-queue</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>event-sourcing</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>execute-around</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>facade</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>factory-kit</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>factory-method</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>factory</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>flux</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>flyweight</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>front-controller</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<packaging>jar</packaging>
|
||||
<artifactId>guarded-suspension</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>half-sync-half-async</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>hexagonal</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>intercepting-filter</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>interpreter</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>iterator</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<groupId>com.iluwatar.layers</groupId>
|
||||
<artifactId>layers</artifactId>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>lazy-loading</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>leader-election</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>leader-followers</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
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|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<modelVersion>4.0.0</modelVersion>
|
||||
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
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|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>master-worker-pattern</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
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|
||||
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|
||||
</parent>
|
||||
<artifactId>mediator</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
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|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>memento</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
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|
||||
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|
||||
</parent>
|
||||
<artifactId>model-view-controller</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>model-view-presenter</artifactId>
|
||||
<name>model-view-presenter</name>
|
||||
|
||||
@ -6,11 +6,11 @@
|
||||
<parent>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>model-view-viewmodel</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
<properties>
|
||||
<zk.version>9.0.0</zk.version>
|
||||
<guava.version>19.0</guava.version>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>module</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>monad</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>monostate</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -29,7 +29,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>multiton</artifactId>
|
||||
<dependencies>
|
||||
@ -38,6 +38,11 @@
|
||||
<artifactId>junit-jupiter-engine</artifactId>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.junit.jupiter</groupId>
|
||||
<artifactId>junit-jupiter-params</artifactId>
|
||||
<scope>test</scope>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
<build>
|
||||
<plugins>
|
||||
|
||||
@ -25,7 +25,8 @@ package com.iluwatar.multiton;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.assertSame;
|
||||
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.junit.jupiter.params.ParameterizedTest;
|
||||
import org.junit.jupiter.params.provider.EnumSource;
|
||||
|
||||
/**
|
||||
* @author anthony
|
||||
@ -37,15 +38,14 @@ class NazgulEnumTest {
|
||||
* Check that multiple calls to any one of the instances in the multiton returns
|
||||
* only that one particular instance, and do that for all instances in multiton
|
||||
*/
|
||||
@Test
|
||||
void testTheSameObjectIsReturnedWithMultipleCalls() {
|
||||
for (var i = 0; i < NazgulEnum.values().length; i++) {
|
||||
var instance1 = NazgulEnum.values()[i];
|
||||
var instance2 = NazgulEnum.values()[i];
|
||||
var instance3 = NazgulEnum.values()[i];
|
||||
assertSame(instance1, instance2);
|
||||
assertSame(instance1, instance3);
|
||||
assertSame(instance2, instance3);
|
||||
}
|
||||
@ParameterizedTest
|
||||
@EnumSource
|
||||
void testTheSameObjectIsReturnedWithMultipleCalls(NazgulEnum nazgulEnum) {
|
||||
var instance1 = nazgulEnum;
|
||||
var instance2 = nazgulEnum;
|
||||
var instance3 = nazgulEnum;
|
||||
assertSame(instance1, instance2);
|
||||
assertSame(instance1, instance3);
|
||||
assertSame(instance2, instance3);
|
||||
}
|
||||
}
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>java-design-patterns</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
<artifactId>mute-idiom</artifactId>
|
||||
<dependencies>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>naked-objects</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>naked-objects-dom</artifactId>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>naked-objects</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>naked-objects-fixture</artifactId>
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
<parent>
|
||||
<groupId>com.iluwatar</groupId>
|
||||
<artifactId>naked-objects</artifactId>
|
||||
<version>1.24.0-SNAPSHOT</version>
|
||||
<version>1.25.0-SNAPSHOT</version>
|
||||
</parent>
|
||||
|
||||
<artifactId>naked-objects-integtests</artifactId>
|
||||
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user