Binding error channel

- bind Spring Integration `errorChannel` as a message producer when the property `spring.cloud.stream.bindings.error.destination` is set
    - The error channel will use this property value as the destination name
  - Add test

This resolves #329

Rename NoopBindable -> BindableAdapter

Return error channel name for getOutputs

Fix review comments

  - Modified integration test to use `Sink` interface
  - Add unit test

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/ErrorChannelTests.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.cloud.stream.config;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.cloud.stream.annotation.Bindings;
+import org.springframework.cloud.stream.annotation.EnableBinding;
+import org.springframework.cloud.stream.binder.redis.config.RedisMessageChannelBinderConfiguration;
+import org.springframework.cloud.stream.messaging.Sink;
+import org.springframework.cloud.stream.messaging.Source;
+import org.springframework.cloud.stream.test.junit.redis.RedisTestSupport;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.integration.annotation.InboundChannelAdapter;
+import org.springframework.integration.annotation.Poller;
+import org.springframework.integration.core.MessageSource;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.MessageHandler;
+import org.springframework.messaging.MessagingException;
+import org.springframework.messaging.support.ErrorMessage;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.util.Assert;
+
+/**
+ * @author Ilayaperumal Gopinathan
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration({ErrorChannelTests.TestSource.class, ErrorChannelTests.TestErrorSink.class})
+public class ErrorChannelTests {
+
+	@Rule
+	public RedisTestSupport redisTestSupport = new RedisTestSupport();
+
+	@Autowired
+	@Bindings(TestErrorSink.class)
+	private Sink testErrorSink;
+
+	@Test
+	public void testErrorChannelBinding() throws Exception {
+		final CountDownLatch latch = new CountDownLatch(1);
+		MessageHandler errorMessageHandler = new MessageHandler() {
+			@Override
+			public void handleMessage(Message<?> message) throws MessagingException {
+				Assert.isTrue(message instanceof ErrorMessage, "Message should be an instance of ErrorMessage");
+				Assert.isTrue(message.getPayload() instanceof MessagingException, "Message payload should be an instance" +
+						"of MessagingException");
+				Assert.isTrue(message.getPayload().toString()
+						.equals("org.springframework.messaging.MessagingException: test"));
+				latch.countDown();
+			}
+		};
+		testErrorSink.input().subscribe(errorMessageHandler);
+		assertTrue(latch.await(10, TimeUnit.SECONDS));
+	}
+
+	@EnableBinding(Source.class)
+	@EnableAutoConfiguration
+	@Import(RedisMessageChannelBinderConfiguration.class)
+	@PropertySource("classpath:/org/springframework/cloud/stream/config/errorchannel/source-channel.properties")
+	public static class TestSource {
+
+		@Bean
+		@InboundChannelAdapter(value = Source.OUTPUT, poller = @Poller(fixedDelay = "5000", maxMessagesPerPoll = "1"))
+		public MessageSource<String> timerMessageSource() {
+			return new MessageSource<String>() {
+				@Override
+				public Message<String> receive() {
+					throw new MessagingException("test");
+				}
+			};
+		}
+	}
+
+	@EnableBinding(Sink.class)
+	@EnableAutoConfiguration
+	@Import(RedisMessageChannelBinderConfiguration.class)
+	@PropertySource("classpath:/org/springframework/cloud/stream/config/errorchannel/errorsink-channel.properties")
+	public static class TestErrorSink {
+
+	}
+}
+

spring-cloud-stream-integration-tests/src/test/java/org/springframework/cloud/stream/config/MessageChannelConfigurerTests.java

@@ -117,7 +117,7 @@ public class MessageChannelConfigurerTests {
 	@EnableBinding(Source.class)
 	@EnableAutoConfiguration
 	@Import(RedisMessageChannelBinderConfiguration.class)
-	@PropertySource("classpath:/org/springframework/cloud/stream/config/source-channel-configurers.properties")
+	@PropertySource("classpath:/org/springframework/cloud/stream/config/channel/source-channel-configurers.properties")
 	public static class TestSource {
 
 	}
@@ -125,7 +125,7 @@ public class MessageChannelConfigurerTests {
 	@EnableBinding(Sink.class)
 	@EnableAutoConfiguration
 	@Import(RedisMessageChannelBinderConfiguration.class)
-	@PropertySource("classpath:/org/springframework/cloud/stream/config/sink-channel-configurers.properties")
+	@PropertySource("classpath:/org/springframework/cloud/stream/config/channel/sink-channel-configurers.properties")
 	public static class TestSink {
 
 	}

spring-cloud-stream-integration-tests/src/test/resources/org/springframework/cloud/stream/config/errorchannel/errorsink-channel.properties

@@ -0,0 +1 @@
+spring.cloud.stream.bindings.input.destination=errorchannel-test

spring-cloud-stream-integration-tests/src/test/resources/org/springframework/cloud/stream/config/errorchannel/source-channel.properties

@@ -0,0 +1,2 @@
+spring.cloud.stream.bindings.output.destination=source-output
+spring.cloud.stream.bindings.error.destination=errorchannel-test