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Moved dispatcher policy into channel - simplified MessageBus, DefaultMessageDispatcher, and DispatcherTask.

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This commit is contained in:
Mark Fisher
2008-01-19 19:26:06 +00:00
parent 6bee7a9997
commit b8aa69e1b5
13 changed files with 225 additions and 223 deletions
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58
spring-integration-core/src/test/java/org/springframework/integration/adapter/stream/ByteStreamTargetAdapterTests.java
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@@ -26,6 +26,7 @@ import org.junit.Test;
import org.springframework.integration.channel.MessageChannel;
import org.springframework.integration.channel.SimpleChannel;
import org.springframework.integration.dispatcher.ChannelPollingMessageRetriever;
import org.springframework.integration.dispatcher.DispatcherPolicy;
import org.springframework.integration.dispatcher.DispatcherTask;
import org.springframework.integration.message.GenericMessage;
import org.springframework.integration.message.StringMessage;
@@ -70,10 +71,11 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testMaxMessagesPerTaskSameAsMessageCount() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(3);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(3);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
@@ -89,10 +91,11 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testMaxMessagesPerTaskLessThanMessageCount() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(2);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(2);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
@@ -107,12 +110,12 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testMaxMessagesPerTaskExceedsMessageCount() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(5);
retriever.setReceiveTimeout(0);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(5);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
channel.send(new GenericMessage<byte[]>(new byte[] {4,5,6}));
@@ -126,12 +129,12 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testMaxMessagesLessThanMessageCountWithMultipleDispatches() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(2);
retriever.setReceiveTimeout(0);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(2);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
channel.send(new GenericMessage<byte[]>(new byte[] {4,5,6}));
@@ -150,12 +153,12 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testMaxMessagesExceedsMessageCountWithMultipleDispatches() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(5);
retriever.setReceiveTimeout(0);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(5);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
channel.send(new GenericMessage<byte[]>(new byte[] {4,5,6}));
@@ -173,11 +176,12 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testStreamResetBetweenDispatches() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(2);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(2);
retriever.setReceiveTimeout(0);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
@@ -196,12 +200,12 @@ public class ByteStreamTargetAdapterTests {
@Test
public void testStreamWriteBetweenDispatches() throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
ByteStreamTargetAdapter adapter = new ByteStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(2);
retriever.setReceiveTimeout(0);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(2);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
channel.send(new GenericMessage<byte[]>(new byte[] {1,2,3}));
channel.send(new GenericMessage<byte[]>(new byte[] {4,5,6}));

40
spring-integration-core/src/test/java/org/springframework/integration/adapter/stream/CharacterStreamTargetAdapterTests.java
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@@ -24,7 +24,7 @@ import org.junit.Test;
import org.springframework.integration.channel.MessageChannel;
import org.springframework.integration.channel.SimpleChannel;
import org.springframework.integration.dispatcher.ChannelPollingMessageRetriever;
import org.springframework.integration.dispatcher.DispatcherPolicy;
import org.springframework.integration.dispatcher.DispatcherTask;
import org.springframework.integration.message.GenericMessage;
import org.springframework.integration.message.StringMessage;
@@ -87,11 +87,11 @@ public class CharacterStreamTargetAdapterTests {
@Test
public void testMaxMessagesPerTaskSameAsMessageCount() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
CharacterStreamTargetAdapter adapter = new CharacterStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setMaxMessagesPerTask(2);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(2);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
channel.send(new StringMessage("foo"));
channel.send(new StringMessage("bar"));
@@ -103,13 +103,13 @@ public class CharacterStreamTargetAdapterTests {
@Test
public void testMaxMessagesPerTaskExceedsMessageCountWithAppendedNewLines() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
CharacterStreamTargetAdapter adapter = new CharacterStreamTargetAdapter(stream);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setMaxMessagesPerTask(10);
dispatcherPolicy.setReceiveTimeout(0);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
adapter.setShouldAppendNewLine(true);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setReceiveTimeout(0);
retriever.setMaxMessagesPerTask(10);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
dispatcherTask.addHandler(adapter);
channel.send(new StringMessage("foo"));
channel.send(new StringMessage("bar"));
@@ -137,12 +137,12 @@ public class CharacterStreamTargetAdapterTests {
@Test
public void testTwoNonStringObjectWithOutNewLines() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
CharacterStreamTargetAdapter adapter = new CharacterStreamTargetAdapter(stream);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setReceiveTimeout(0);
retriever.setMaxMessagesPerTask(2);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setReceiveTimeout(0);
dispatcherPolicy.setMaxMessagesPerTask(2);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
dispatcherTask.addHandler(adapter);
TestObject testObject1 = new TestObject("foo");
TestObject testObject2 = new TestObject("bar");
@@ -156,13 +156,13 @@ public class CharacterStreamTargetAdapterTests {
@Test
public void testTwoNonStringObjectWithNewLines() {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MessageChannel channel = new SimpleChannel();
CharacterStreamTargetAdapter adapter = new CharacterStreamTargetAdapter(stream);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setReceiveTimeout(0);
dispatcherPolicy.setMaxMessagesPerTask(2);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
DispatcherTask dispatcherTask = new DispatcherTask(channel);
adapter.setShouldAppendNewLine(true);
ChannelPollingMessageRetriever retriever = new ChannelPollingMessageRetriever(channel);
retriever.setReceiveTimeout(0);
retriever.setMaxMessagesPerTask(2);
DispatcherTask dispatcherTask = new DispatcherTask(retriever);
dispatcherTask.addHandler(adapter);
TestObject testObject1 = new TestObject("foo");
TestObject testObject2 = new TestObject("bar");

5
spring-integration-core/src/test/java/org/springframework/integration/bus/MessageBusTests.java
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@@ -33,6 +33,7 @@ import org.springframework.integration.adapter.PollingSourceAdapter;
import org.springframework.integration.adapter.SourceAdapter;
import org.springframework.integration.channel.MessageChannel;
import org.springframework.integration.channel.SimpleChannel;
import org.springframework.integration.dispatcher.DispatcherPolicy;
import org.springframework.integration.handler.MessageHandler;
import org.springframework.integration.message.ErrorMessage;
import org.springframework.integration.message.GenericMessage;
@@ -127,8 +128,8 @@ public class MessageBusTests {
@Test
public void testBothHandlersReceivePublishSubscribeMessage() {
SimpleChannel inputChannel = new SimpleChannel();
inputChannel.setPublishSubscribe(true);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy(true);
SimpleChannel inputChannel = new SimpleChannel(dispatcherPolicy);
SimpleChannel outputChannel1 = new SimpleChannel();
SimpleChannel outputChannel2 = new SimpleChannel();
MessageHandler handler1 = new MessageHandler() {

78
spring-integration-core/src/test/java/org/springframework/integration/dispatcher/DefaultMessageDispatcherTests.java
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@@ -76,8 +76,7 @@ public class DefaultMessageDispatcherTests {
final CountDownLatch latch = new CountDownLatch(2);
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(true));
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1));
@@ -123,8 +122,7 @@ public class DefaultMessageDispatcherTests {
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
MessageHandler handler3 = TestHandlers.countingCountDownHandler(counter3, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(true));
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1));
@@ -158,12 +156,11 @@ public class DefaultMessageDispatcherTests {
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
MessageHandler handler3 = TestHandlers.countingCountDownHandler(counter3, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(true));
channel.getDispatcherPolicy().setRejectionLimit(2);
channel.getDispatcherPolicy().setRetryInterval(3);
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(2);
dispatcher.setRetryInterval(3);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1));
dispatcher.addHandler(new ConcurrentHandler(handler2, 1, 1) {
@Override
@@ -192,13 +189,12 @@ public class DefaultMessageDispatcherTests {
final CountDownLatch latch = new CountDownLatch(3);
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(true));
channel.getDispatcherPolicy().setRejectionLimit(2);
channel.getDispatcherPolicy().setRetryInterval(3);
channel.getDispatcherPolicy().setShouldFailOnRejectionLimit(false);
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(2);
dispatcher.setRetryInterval(3);
dispatcher.setShouldFailOnRejectionLimit(false);
dispatcher.addHandler(handler1);
dispatcher.addHandler(new MessageHandler() {
public Message<?> handle(Message<?> message) {
@@ -215,30 +211,16 @@ public class DefaultMessageDispatcherTests {
@Test
public void testNonBroadcastingDispatcherReachesRejectionLimitAndShouldFail() throws InterruptedException {
final AtomicInteger counter1 = new AtomicInteger();
final AtomicInteger counter2 = new AtomicInteger();
final CountDownLatch latch = new CountDownLatch(4);
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
MessageHandler handler1 = TestHandlers.rejectingCountDownHandler(latch);
MessageHandler handler2 = TestHandlers.rejectingCountDownHandler(latch);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(false));
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(2);
dispatcher.setRetryInterval(3);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1) {
@Override
public Message<?> handle(Message<?> message) {
latch.countDown();
throw new MessageHandlerRejectedExecutionException();
}
});
dispatcher.addHandler(new ConcurrentHandler(handler2, 1, 1) {
@Override
public Message<?> handle(Message<?> message) {
latch.countDown();
throw new MessageHandlerRejectedExecutionException();
}
});
channel.getDispatcherPolicy().setRejectionLimit(2);
channel.getDispatcherPolicy().setRetryInterval(3);
dispatcher.addHandler(handler1);
dispatcher.addHandler(handler2);
SimpleChannel errorChannel = new SimpleChannel();
SimpleMessagingTaskScheduler scheduler = new SimpleMessagingTaskScheduler();
scheduler.setErrorHandler(new MessagePublishingErrorHandler(errorChannel));
@@ -262,11 +244,11 @@ public class DefaultMessageDispatcherTests {
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
channel.getDispatcherPolicy().setRejectionLimit(2);
channel.getDispatcherPolicy().setRetryInterval(3);
channel.getDispatcherPolicy().setShouldFailOnRejectionLimit(false);
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(2);
dispatcher.setRetryInterval(3);
dispatcher.setShouldFailOnRejectionLimit(false);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1) {
@Override
public Message<?> handle(Message<?> message) {
@@ -304,12 +286,13 @@ public class DefaultMessageDispatcherTests {
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
MessageHandler handler3 = TestHandlers.countingCountDownHandler(counter3, latch);
SimpleChannel channel = new SimpleChannel();
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy();
dispatcherPolicy.setRejectionLimit(2);
dispatcherPolicy.setRetryInterval(3);
dispatcherPolicy.setShouldFailOnRejectionLimit(false);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(2);
dispatcher.setRetryInterval(3);
dispatcher.setShouldFailOnRejectionLimit(false);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1) {
@Override
public Message<?> handle(Message<?> message) {
@@ -357,13 +340,13 @@ public class DefaultMessageDispatcherTests {
final CountDownLatch latch = new CountDownLatch(8);
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
DispatcherPolicy dispatcherPolicy = new DispatcherPolicy(true);
dispatcherPolicy.setRejectionLimit(5);
dispatcherPolicy.setRetryInterval(3);
dispatcherPolicy.setShouldFailOnRejectionLimit(false);
SimpleChannel channel = new SimpleChannel(dispatcherPolicy);
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
dispatcher.setRejectionLimit(5);
dispatcher.setRetryInterval(3);
dispatcher.setShouldFailOnRejectionLimit(false);
dispatcher.addHandler(new ConcurrentHandler(handler1, 1, 1) {
@Override
public Message<?> handle(Message<?> message) {
@@ -471,8 +454,7 @@ public class DefaultMessageDispatcherTests {
final CountDownLatch latch = new CountDownLatch(1);
MessageHandler handler1 = TestHandlers.countingCountDownHandler(counter1, latch);
MessageHandler handler2 = TestHandlers.countingCountDownHandler(counter2, latch);
SimpleChannel channel = new SimpleChannel();
channel.setPublishSubscribe(true);
SimpleChannel channel = new SimpleChannel(new DispatcherPolicy(true));
channel.send(new StringMessage(1, "test"));
DefaultMessageDispatcher dispatcher = new DefaultMessageDispatcher(channel);
DefaultMessageEndpoint endpoint1 = new DefaultMessageEndpoint();

25
spring-integration-core/src/test/java/org/springframework/integration/handler/TestHandlers.java
View File

@@ -19,6 +19,7 @@ package org.springframework.integration.handler;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.integration.dispatcher.MessageHandlerRejectedExecutionException;
import org.springframework.integration.message.Message;
/**
@@ -40,6 +41,30 @@ public abstract class TestHandlers {
};
}
/**
* Create a {@link MessageHandler} that throws a {@link MessageHandlerRejectedExecutionException}.
*/
public final static MessageHandler rejectingHandler() {
return new MessageHandler() {
public Message<?> handle(Message<?> message) {
throw new MessageHandlerRejectedExecutionException();
}
};
}
/**
* Create a {@link MessageHandler} that counts down on the provided latch and
* then throws a {@link MessageHandlerRejectedExecutionException}.
*/
public final static MessageHandler rejectingCountDownHandler(final CountDownLatch latch) {
return new MessageHandler() {
public Message<?> handle(Message<?> message) {
latch.countDown();
throw new MessageHandlerRejectedExecutionException();
}
};
}
/**
* Create a {@link MessageHandler} that increments the provided counter.
*/