gaspersic/java-design-patterns
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

sonar fix - add test cases for CommanderTest

Browse Source
This commit is contained in:
atayal
2021-11-05 15:47:01 +05:30
parent 61dcb53bac
commit 8fd00da97a
1 changed files with 112 additions and 582 deletions
Download Patch File Download Diff File Expand all files Collapse all files

694
commander/src/test/java/com/iluwatar/commander/CommanderTest.java
View File

@ -1,605 +1,135 @@
/*
* The MIT License
* Copyright © 2014-2021 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.commander;
import com.iluwatar.commander.Order.MessageSent;
import com.iluwatar.commander.Order.PaymentStatus;
import com.iluwatar.commander.employeehandle.EmployeeDatabase;
import com.iluwatar.commander.employeehandle.EmployeeHandle;
import com.iluwatar.commander.exceptions.DatabaseUnavailableException;
import com.iluwatar.commander.exceptions.ItemUnavailableException;
import com.iluwatar.commander.exceptions.PaymentDetailsErrorException;
import com.iluwatar.commander.exceptions.ShippingNotPossibleException;
import com.iluwatar.commander.messagingservice.MessagingDatabase;
import com.iluwatar.commander.messagingservice.MessagingService;
import com.iluwatar.commander.paymentservice.PaymentDatabase;
import com.iluwatar.commander.paymentservice.PaymentService;
import com.iluwatar.commander.queue.QueueDatabase;
import com.iluwatar.commander.queue.QueueTask;
import com.iluwatar.commander.queue.QueueTask.TaskType;
import com.iluwatar.commander.shippingservice.ShippingDatabase;
import com.iluwatar.commander.shippingservice.ShippingService;
import org.junit.jupiter.api.Test;
import org.junit.platform.commons.util.StringUtils;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.jupiter.api.Assertions.assertFalse;
/**
* <p>Commander pattern is used to handle all issues that can come up while making a
* distributed transaction. The idea is to have a commander, which coordinates the execution of all
* instructions and ensures proper completion using retries and taking care of idempotence. By
* queueing instructions while they haven't been done, we can ensure a state of 'eventual
* consistency'.</p>
* <p>In our example, we have an e-commerce application. When the user places an order,
* the shipping service is intimated first. If the service does not respond for some reason, the
* order is not placed. If response is received, the commander then calls for the payment service to
* be intimated. If this fails, the shipping still takes place (order converted to COD) and the item
* is queued. If the queue is also found to be unavailable, the payment is noted to be not done and
* this is added to an employee database. Three types of messages are sent to the user - one, if
* payment succeeds; two, if payment fails definitively; and three, if payment fails in the first
* attempt. If the message is not sent, this is also queued and is added to employee db. We also
* have a time limit for each instruction to be completed, after which, the instruction is not
* executed, thereby ensuring that resources are not held for too long. In the rare occasion in
* which everything fails, an individual would have to step in to figure out how to solve the
* issue.</p>
* <p>We have abstract classes {@link Database} and {@link Service} which are extended
* by all the databases and services. Each service has a database to be updated, and receives
* request from an outside user (the {@link Commander} class here). There are 5 microservices -
* {@link ShippingService}, {@link PaymentService}, {@link MessagingService}, {@link EmployeeHandle}
* and a {@link QueueDatabase}. We use retries to execute any instruction using {@link Retry} class,
* and idempotence is ensured by going through some checks before making requests to services and
* making change in {@link Order} class fields if request succeeds or definitively fails. There are
* 5 classes - {@link AppShippingFailCases}, {@link AppPaymentFailCases}, {@link
* AppMessagingFailCases}, {@link AppQueueFailCases} and {@link AppEmployeeDbFailCases}, which look
* at the different scenarios that may be encountered during the placing of an order.</p>
*/
class CommanderTest {
public class Commander {
private final int numOfRetries = 1;
private final long retryDuration = 10_000;
private final long queueTime = 1_000;
private final long queueTaskTime = 10_000;
private final long paymentTime = 60_000;
private final long messageTime = 50_000;
private final long employeeTime = 20_000;
private final QueueDatabase queue;
private final EmployeeHandle employeeDb;
private final PaymentService paymentService;
private final ShippingService shippingService;
private final MessagingService messagingService;
private int queueItems = 0; //keeping track here only so don't need access to queue db to get this
private final int numOfRetries;
private final long retryDuration;
private final long queueTime;
private final long queueTaskTime;
private final long paymentTime;
private final long messageTime;
private final long employeeTime;
private boolean finalSiteMsgShown;
private static final Logger LOG = LoggerFactory.getLogger(Commander.class);
//we could also have another db where it stores all orders
private static final String ORDER_ID = "Order {}";
private static final String REQUEST_ID = " request Id: {}";
private static final String ERROR_CONNECTING_MSG_SVC =
": Error in connecting to messaging service ";
private static final String TRY_CONNECTING_MSG_SVC =
": Trying to connect to messaging service..";
Commander(EmployeeHandle empDb, PaymentService paymentService, ShippingService shippingService,
MessagingService messagingService, QueueDatabase qdb, int numOfRetries,
long retryDuration, long queueTime, long queueTaskTime, long paymentTime,
long messageTime, long employeeTime) {
this.paymentService = paymentService;
this.shippingService = shippingService;
this.messagingService = messagingService;
this.employeeDb = empDb;
this.queue = qdb;
this.numOfRetries = numOfRetries;
this.retryDuration = retryDuration;
this.queueTime = queueTime;
this.queueTaskTime = queueTaskTime;
this.paymentTime = paymentTime;
this.messageTime = messageTime;
this.employeeTime = employeeTime;
this.finalSiteMsgShown = false;
private Commander buildCommanderObject() {
PaymentService paymentService = new PaymentService
(new PaymentDatabase(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException());
var shippingService = new ShippingService(new ShippingDatabase());
var messagingService = new MessagingService(new MessagingDatabase());
var employeeHandle = new EmployeeHandle
(new EmployeeDatabase(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException());
var qdb = new QueueDatabase
(new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException(),
new DatabaseUnavailableException(), new DatabaseUnavailableException());
return new Commander(employeeHandle, paymentService, shippingService,
messagingService, qdb, numOfRetries, retryDuration,
queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
}
void placeOrder(Order order) throws Exception {
sendShippingRequest(order);
private Commander buildCommanderObjectWithoutDB() {
return buildCommanderObjectWithoutDB(false, false, new IllegalStateException());
}
private void sendShippingRequest(Order order) throws Exception {
var list = shippingService.exceptionsList;
Retry.Operation op = (l) -> {
if (!l.isEmpty()) {
if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
LOG.debug(ORDER_ID + ": Error in connecting to shipping service, "
+ "trying again..", order.id);
} else {
LOG.debug(ORDER_ID + ": Error in creating shipping request..", order.id);
}
throw l.remove(0);
}
String transactionId = shippingService.receiveRequest(order.item, order.user.address);
//could save this transaction id in a db too
LOG.info(ORDER_ID + ": Shipping placed successfully, transaction id: {}",
order.id, transactionId);
LOG.info("Order has been placed and will be shipped to you. Please wait while we make your"
+ " payment... ");
sendPaymentRequest(order);
};
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
if (ShippingNotPossibleException.class.isAssignableFrom(err.getClass())) {
LOG.info("Shipping is currently not possible to your address. We are working on the problem"
+ " and will get back to you asap.");
finalSiteMsgShown = true;
LOG.info(ORDER_ID + ": Shipping not possible to address, trying to add problem "
+ "to employee db..", order.id);
employeeHandleIssue(o);
} else if (ItemUnavailableException.class.isAssignableFrom(err.getClass())) {
LOG.info("This item is currently unavailable. We will inform you as soon as the item "
+ "becomes available again.");
finalSiteMsgShown = true;
LOG.info(ORDER_ID + ": Item {}" + " unavailable, trying to add "
+ "problem to employee handle..", order.id, order.item);
employeeHandleIssue(o);
} else {
LOG.info("Sorry, there was a problem in creating your order. Please try later.");
LOG.error(ORDER_ID + ": Shipping service unavailable, order not placed..", order.id);
finalSiteMsgShown = true;
}
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
r.perform(list, order);
}
private void sendPaymentRequest(Order order) {
if (System.currentTimeMillis() - order.createdTime >= this.paymentTime) {
if (order.paid.equals(PaymentStatus.TRYING)) {
order.paid = PaymentStatus.NOT_DONE;
sendPaymentFailureMessage(order);
LOG.error(ORDER_ID + ": Payment time for order over, failed and returning..", order.id);
} //if succeeded or failed, would have been dequeued, no attempt to make payment
return;
}
var list = paymentService.exceptionsList;
var t = new Thread(() -> {
Retry.Operation op = (l) -> {
if (!l.isEmpty()) {
if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
LOG.debug(ORDER_ID + ": Error in connecting to payment service,"
+ " trying again..", order.id);
} else {
LOG.debug(ORDER_ID + ": Error in creating payment request..", order.id);
}
throw l.remove(0);
}
if (order.paid.equals(PaymentStatus.TRYING)) {
var transactionId = paymentService.receiveRequest(order.price);
order.paid = PaymentStatus.DONE;
LOG.info(ORDER_ID + ": Payment successful, transaction Id: {}",
order.id, transactionId);
if (!finalSiteMsgShown) {
LOG.info("Payment made successfully, thank you for shopping with us!!");
finalSiteMsgShown = true;
}
sendSuccessMessage(order);
}
};
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
if (PaymentDetailsErrorException.class.isAssignableFrom(err.getClass())) {
if (!finalSiteMsgShown) {
LOG.info("There was an error in payment. Your account/card details "
+ "may have been incorrect. "
+ "Meanwhile, your order has been converted to COD and will be shipped.");
finalSiteMsgShown = true;
}
LOG.error(ORDER_ID + ": Payment details incorrect, failed..", order.id);
o.paid = PaymentStatus.NOT_DONE;
sendPaymentFailureMessage(o);
} else {
if (o.messageSent.equals(MessageSent.NONE_SENT)) {
if (!finalSiteMsgShown) {
LOG.info("There was an error in payment. We are on it, and will get back to you "
+ "asap. Don't worry, your order has been placed and will be shipped.");
finalSiteMsgShown = true;
}
LOG.warn(ORDER_ID + ": Payment error, going to queue..", order.id);
sendPaymentPossibleErrorMsg(o);
}
if (o.paid.equals(PaymentStatus.TRYING) && System
.currentTimeMillis() - o.createdTime < paymentTime) {
var qt = new QueueTask(o, TaskType.PAYMENT, -1);
updateQueue(qt);
}
}
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, order);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void updateQueue(QueueTask qt) {
if (System.currentTimeMillis() - qt.order.createdTime >= this.queueTime) {
// since payment time is lesser than queuetime it would have already failed..
// additional check not needed
LOG.trace(ORDER_ID + ": Queue time for order over, failed..", qt.order.id);
return;
} else if (qt.taskType.equals(TaskType.PAYMENT) && !qt.order.paid.equals(PaymentStatus.TRYING)
|| qt.taskType.equals(TaskType.MESSAGING) && (qt.messageType == 1
&& !qt.order.messageSent.equals(MessageSent.NONE_SENT)
|| qt.order.messageSent.equals(MessageSent.PAYMENT_FAIL)
|| qt.order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL))
|| qt.taskType.equals(TaskType.EMPLOYEE_DB) && qt.order.addedToEmployeeHandle) {
LOG.trace(ORDER_ID + ": Not queueing task since task already done..", qt.order.id);
return;
}
var list = queue.exceptionsList;
Thread t = new Thread(() -> {
Retry.Operation op = (list1) -> {
if (!list1.isEmpty()) {
LOG.warn(ORDER_ID + ": Error in connecting to queue db, trying again..", qt.order.id);
throw list1.remove(0);
}
queue.add(qt);
queueItems++;
LOG.info(ORDER_ID + ": {}" + " task enqueued..", qt.order.id, qt.getType());
tryDoingTasksInQueue();
};
Retry.HandleErrorIssue<QueueTask> handleError = (qt1, err) -> {
if (qt1.taskType.equals(TaskType.PAYMENT)) {
qt1.order.paid = PaymentStatus.NOT_DONE;
sendPaymentFailureMessage(qt1.order);
LOG.error(ORDER_ID + ": Unable to enqueue payment task,"
+ " payment failed..", qt1.order.id);
}
LOG.error(ORDER_ID + ": Unable to enqueue task of type {}"
+ ", trying to add to employee handle..", qt1.order.id, qt1.getType());
employeeHandleIssue(qt1.order);
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, qt);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void tryDoingTasksInQueue() { //commander controls operations done to queue
var list = queue.exceptionsList;
var t2 = new Thread(() -> {
Retry.Operation op = (list1) -> {
if (!list1.isEmpty()) {
LOG.warn("Error in accessing queue db to do tasks, trying again..");
throw list1.remove(0);
}
doTasksInQueue();
};
Retry.HandleErrorIssue<QueueTask> handleError = (o, err) -> {
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, null);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t2.start();
}
private void tryDequeue() {
var list = queue.exceptionsList;
var t3 = new Thread(() -> {
Retry.Operation op = (list1) -> {
if (!list1.isEmpty()) {
LOG.warn("Error in accessing queue db to dequeue task, trying again..");
throw list1.remove(0);
}
queue.dequeue();
queueItems--;
};
Retry.HandleErrorIssue<QueueTask> handleError = (o, err) -> {
};
var r = new Retry<QueueTask>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, null);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t3.start();
}
private void sendSuccessMessage(Order order) {
if (System.currentTimeMillis() - order.createdTime >= this.messageTime) {
LOG.trace(ORDER_ID + ": Message time for order over, returning..", order.id);
return;
}
var list = messagingService.exceptionsList;
Thread t = new Thread(() -> {
Retry.Operation op = handleSuccessMessageRetryOperation(order);
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
handleSuccessMessageErrorIssue(order, o);
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, order);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void handleSuccessMessageErrorIssue(Order order, Order o) {
if ((o.messageSent.equals(MessageSent.NONE_SENT) || o.messageSent
.equals(MessageSent.PAYMENT_TRYING))
&& System.currentTimeMillis() - o.createdTime < messageTime) {
var qt = new QueueTask(order, TaskType.MESSAGING, 2);
updateQueue(qt);
LOG.info(ORDER_ID + ": Error in sending Payment Success message, trying to"
+ " queue task and add to employee handle..", order.id);
employeeHandleIssue(order);
}
}
private Retry.Operation handleSuccessMessageRetryOperation(Order order) {
return (l) -> {
if (!l.isEmpty()) {
if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+ "(Payment Success msg), trying again..", order.id);
} else {
LOG.debug(ORDER_ID + ": Error in creating Payment Success"
+ " messaging request..", order.id);
}
throw l.remove(0);
}
if (!order.messageSent.equals(MessageSent.PAYMENT_FAIL)
&& !order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
var requestId = messagingService.receiveRequest(2);
order.messageSent = MessageSent.PAYMENT_SUCCESSFUL;
LOG.info(ORDER_ID + ": Payment Success message sent,"
+ REQUEST_ID, order.id, requestId);
}
};
}
private void sendPaymentFailureMessage(Order order) {
if (System.currentTimeMillis() - order.createdTime >= this.messageTime) {
LOG.trace(ORDER_ID + ": Message time for order over, returning..", order.id);
return;
}
var list = messagingService.exceptionsList;
var t = new Thread(() -> {
Retry.Operation op = (l) -> {
handlePaymentFailureRetryOperation(order, l);
};
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
handlePaymentErrorIssue(order, o);
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, order);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void handlePaymentErrorIssue(Order order, Order o) {
if ((o.messageSent.equals(MessageSent.NONE_SENT) || o.messageSent
.equals(MessageSent.PAYMENT_TRYING))
&& System.currentTimeMillis() - o.createdTime < messageTime) {
var qt = new QueueTask(order, TaskType.MESSAGING, 0);
updateQueue(qt);
LOG.warn(ORDER_ID + ": Error in sending Payment Failure message, "
+ "trying to queue task and add to employee handle..", order.id);
employeeHandleIssue(o);
}
}
private void handlePaymentFailureRetryOperation(Order order, List<Exception> l) throws Exception {
if (!l.isEmpty()) {
if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+ "(Payment Failure msg), trying again..", order.id);
} else {
LOG.debug(ORDER_ID + ": Error in creating Payment Failure"
+ " message request..", order.id);
}
throw l.remove(0);
}
if (!order.messageSent.equals(MessageSent.PAYMENT_FAIL)
&& !order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
var requestId = messagingService.receiveRequest(0);
order.messageSent = MessageSent.PAYMENT_FAIL;
LOG.info(ORDER_ID + ": Payment Failure message sent successfully,"
+ REQUEST_ID, order.id, requestId);
}
}
private void sendPaymentPossibleErrorMsg(Order order) {
if (System.currentTimeMillis() - order.createdTime >= this.messageTime) {
LOG.trace("Message time for order over, returning..");
return;
}
var list = messagingService.exceptionsList;
var t = new Thread(() -> {
Retry.Operation op = (l) -> {
handlePaymentPossibleErrorMsgRetryOperation(order, l);
};
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
handlePaymentPossibleErrorMsgErrorIssue(order, o);
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, order);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void handlePaymentPossibleErrorMsgErrorIssue(Order order, Order o) {
if (o.messageSent.equals(MessageSent.NONE_SENT) && order.paid
.equals(PaymentStatus.TRYING)
&& System.currentTimeMillis() - o.createdTime < messageTime) {
var qt = new QueueTask(order, TaskType.MESSAGING, 1);
updateQueue(qt);
LOG.warn(ORDER_ID + ": Error in sending Payment Error message, "
+ "trying to queue task and add to employee handle..", order.id);
employeeHandleIssue(o);
}
}
private void handlePaymentPossibleErrorMsgRetryOperation(Order order, List<Exception> l)
throws Exception {
if (!l.isEmpty()) {
if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+ "(Payment Error msg), trying again..", order.id);
} else {
LOG.debug(ORDER_ID + ": Error in creating Payment Error"
+ " messaging request..", order.id);
}
throw l.remove(0);
}
if (order.paid.equals(PaymentStatus.TRYING) && order.messageSent
.equals(MessageSent.NONE_SENT)) {
var requestId = messagingService.receiveRequest(1);
order.messageSent = MessageSent.PAYMENT_TRYING;
LOG.info(ORDER_ID + ": Payment Error message sent successfully,"
+ REQUEST_ID, order.id, requestId);
}
}
private void employeeHandleIssue(Order order) {
if (System.currentTimeMillis() - order.createdTime >= this.employeeTime) {
LOG.trace(ORDER_ID + ": Employee handle time for order over, returning..", order.id);
return;
}
var list = employeeDb.exceptionsList;
var t = new Thread(() -> {
Retry.Operation op = (l) -> {
if (!l.isEmpty()) {
LOG.warn(ORDER_ID + ": Error in connecting to employee handle,"
+ " trying again..", order.id);
throw l.remove(0);
}
if (!order.addedToEmployeeHandle) {
employeeDb.receiveRequest(order);
order.addedToEmployeeHandle = true;
LOG.info(ORDER_ID + ": Added order to employee database", order.id);
}
};
Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
if (!o.addedToEmployeeHandle && System
.currentTimeMillis() - order.createdTime < employeeTime) {
var qt = new QueueTask(order, TaskType.EMPLOYEE_DB, -1);
updateQueue(qt);
LOG.warn(ORDER_ID + ": Error in adding to employee db,"
+ " trying to queue task..", order.id);
}
};
var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
e -> DatabaseUnavailableException.class.isAssignableFrom(e.getClass()));
try {
r.perform(list, order);
} catch (Exception e1) {
e1.printStackTrace();
}
});
t.start();
}
private void doTasksInQueue() throws Exception {
if (queueItems != 0) {
var qt = queue.peek(); //this should probably be cloned here
//this is why we have retry for doTasksInQueue
LOG.trace(ORDER_ID + ": Started doing task of type {}", qt.order.id, qt.getType());
if (qt.getFirstAttemptTime() == -1) {
qt.setFirstAttemptTime(System.currentTimeMillis());
}
if (System.currentTimeMillis() - qt.getFirstAttemptTime() >= queueTaskTime) {
tryDequeue();
LOG.trace(ORDER_ID + ": This queue task of type {}"
+ " does not need to be done anymore (timeout), dequeue..", qt.order.id, qt.getType());
} else {
if (qt.taskType.equals(TaskType.PAYMENT)) {
if (!qt.order.paid.equals(PaymentStatus.TRYING)) {
tryDequeue();
LOG.trace(ORDER_ID + ": This payment task already done, dequeueing..", qt.order.id);
} else {
sendPaymentRequest(qt.order);
LOG.debug(ORDER_ID + ": Trying to connect to payment service..", qt.order.id);
}
} else if (qt.taskType.equals(TaskType.MESSAGING)) {
if (qt.order.messageSent.equals(MessageSent.PAYMENT_FAIL)
|| qt.order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
tryDequeue();
LOG.trace(ORDER_ID + ": This messaging task already done, dequeue..", qt.order.id);
} else if (qt.messageType == 1 && (!qt.order.messageSent.equals(MessageSent.NONE_SENT)
|| !qt.order.paid.equals(PaymentStatus.TRYING))) {
tryDequeue();
LOG.trace(ORDER_ID + ": This messaging task does not need to be done,"
+ " dequeue..", qt.order.id);
} else if (qt.messageType == 0) {
sendPaymentFailureMessage(qt.order);
LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
} else if (qt.messageType == 1) {
sendPaymentPossibleErrorMsg(qt.order);
LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
} else if (qt.messageType == 2) {
sendSuccessMessage(qt.order);
LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
}
} else if (qt.taskType.equals(TaskType.EMPLOYEE_DB)) {
if (qt.order.addedToEmployeeHandle) {
tryDequeue();
LOG.trace(ORDER_ID + ": This employee handle task already done,"
+ " dequeue..", qt.order.id);
} else {
employeeHandleIssue(qt.order);
LOG.debug(ORDER_ID + ": Trying to connect to employee handle..", qt.order.id);
}
}
}
}
if (queueItems == 0) {
LOG.trace("Queue is empty, returning..");
private Commander buildCommanderObjectWithoutDB(boolean includeException, boolean includeDBException, Exception e) {
var l = includeDBException ? new DatabaseUnavailableException() : e;
PaymentService paymentService;
ShippingService shippingService;
MessagingService messagingService;
EmployeeHandle employeeHandle;
if (includeException) {
paymentService = new PaymentService
(null, l);
shippingService = new ShippingService(null, l);
messagingService = new MessagingService(null, l);
employeeHandle = new EmployeeHandle
(null, l);
} else {
Thread.sleep(queueTaskTime / 3);
tryDoingTasksInQueue();
paymentService = new PaymentService
(null);
shippingService = new ShippingService(null);
messagingService = new MessagingService(null);
employeeHandle = new EmployeeHandle
(null);
}
return new Commander(employeeHandle, paymentService, shippingService,
messagingService, null, numOfRetries, retryDuration,
queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
}
@Test
void testPlaceOrder() throws Exception {
Commander c = buildCommanderObject();
var order = new Order(new User("K", "J"), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
}
@Test
void testPlaceOrderWithServiceException() throws Exception {
Commander c = buildCommanderObjectWithoutDB();
var order = new Order(new User("K", null), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
}
@Test
void testPlaceOrderWithServiceExceptionAndList() throws Exception {
List<Exception> l = new ArrayList<Exception>();
l.add(new ShippingNotPossibleException());
l.add(new ItemUnavailableException());
l.add(new IllegalStateException());
for (Exception e : l) {
Commander c = buildCommanderObjectWithoutDB(true, true, e);
var order = new Order(new User("K", null), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
c = buildCommanderObjectWithoutDB(true, false, e);
order = new Order(new User("K", null), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
c = buildCommanderObjectWithoutDB(false, false, e);
order = new Order(new User("K", null), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
c = buildCommanderObjectWithoutDB(false, true, e);
order = new Order(new User("K", null), "pen", 1f);
c.placeOrder(order);
assertFalse(StringUtils.isBlank(order.id));
}
}