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Ilkka Seppala 2015-03-29 22:13:08 +03:00
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README.md
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@ -422,6 +422,9 @@ Behavioral patterns are concerned with algorithms and the assignment of responsi
**Applicability:** Use the Callback pattern when **Applicability:** Use the Callback pattern when
* When some arbitrary synchronous or asynchronous action must be performed after execution of some defined activity. * When some arbitrary synchronous or asynchronous action must be performed after execution of some defined activity.
**Real world examples:**
* [CyclicBarrier] (http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html#CyclicBarrier%28int,%20java.lang.Runnable%29) constructor can accept callback that will be triggered every time when barrier is tripped.
## <a name="execute-around">Execute Around</a> [&#8593;](#list-of-design-patterns) ## <a name="execute-around">Execute Around</a> [&#8593;](#list-of-design-patterns)
**Intent:** Execute Around idiom frees the user from certain actions that should always be executed before and after the business method. A good example of this is resource allocation and deallocation leaving the user to specify only what to do with the resource. **Intent:** Execute Around idiom frees the user from certain actions that should always be executed before and after the business method. A good example of this is resource allocation and deallocation leaving the user to specify only what to do with the resource.
@ -430,7 +433,6 @@ Behavioral patterns are concerned with algorithms and the assignment of responsi
**Applicability:** Use the Execute Around idiom when **Applicability:** Use the Execute Around idiom when
* You use an API that requires methods to be called in pairs such as open/close or allocate/deallocate. * You use an API that requires methods to be called in pairs such as open/close or allocate/deallocate.
# Frequently asked questions # Frequently asked questions
**<a id="Q1">Q: What is the difference between State and Strategy patterns?</a>** **<a id="Q1">Q: What is the difference between State and Strategy patterns?</a>**

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callback/src/main/java/com/iluwatar/App.java
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package com.iluwatar; package com.iluwatar;
/** /**
* Callback pattern is more native for dynamic languages where function are first-class citizen. * Callback pattern is more native for functional languages where function is treated as first-class citizen.
* Prior to Java8 can be simulated using simple (alike command) interfaces. * Prior to Java8 can be simulated using simple (alike command) interfaces.
*/ */
public class App { public class App {