Migrating event adapters to spring-integration-adapters

spring-integration-adapters/src/main/java/org/springframework/integration/adapter/event/ApplicationEventSourceAdapter.java

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+/*
+ * Copyright 2002-2007 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.integration.adapter.event;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.context.ApplicationEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.integration.adapter.AbstractSourceAdapter;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+
+/**
+ * A source adapter for passing Spring
+ * {@link ApplicationEvent ApplicationEvents} within messages.
+ * 
+ * @author Mark Fisher
+ */
+public class ApplicationEventSourceAdapter extends AbstractSourceAdapter<ApplicationEvent> implements
+		ApplicationListener {
+
+	private List<Class<? extends ApplicationEvent>> eventTypes = new ArrayList<Class<? extends ApplicationEvent>>();
+
+
+	/**
+	 * Set the list of event types (classes that extend ApplicationEvent) that
+	 * this adapter should send to the message channel. By default, all event
+	 * types will be sent.
+	 */
+	public void setEventTypes(List<Class<? extends ApplicationEvent>> eventTypes) {
+		Assert.notEmpty(eventTypes, "at least one event type is required");
+		this.eventTypes = eventTypes;
+	}
+
+	public void onApplicationEvent(ApplicationEvent event) {
+		if (CollectionUtils.isEmpty(this.eventTypes)) {
+			this.sendToChannel(event);
+			return;
+		}
+		for (Class<? extends ApplicationEvent> eventType : this.eventTypes) {
+			if (eventType.isAssignableFrom(event.getClass())) {
+				this.sendToChannel(event);
+				return;
+			}
+		}
+	}
+
+}

spring-integration-adapters/src/main/java/org/springframework/integration/adapter/event/ApplicationEventTargetAdapter.java

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+/*
+ * Copyright 2002-2007 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.integration.adapter.event;
+
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.ApplicationEventPublisherAware;
+import org.springframework.integration.adapter.AbstractTargetAdapter;
+
+/**
+ * A target adapter for publishing {@link MessagingEvent MessagingEvents}. The
+ * {@link MessagingEvent} is a subclass of Spring's {@link ApplicationEvent}
+ * used by this adapter to wrap any {@link Message} received on its channel.
+ * 
+ * @author Mark Fisher
+ */
+public class ApplicationEventTargetAdapter extends AbstractTargetAdapter<MessagingEvent> implements
+		ApplicationEventPublisherAware {
+
+	private ApplicationEventPublisher applicationEventPublisher;
+
+
+	public ApplicationEventTargetAdapter() {
+		this.setMessageMapper(new MessagingEventMapper());
+	}
+
+
+	public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
+		this.applicationEventPublisher = applicationEventPublisher;
+	}
+
+	@Override
+	protected boolean sendToTarget(MessagingEvent event) {
+		this.applicationEventPublisher.publishEvent(event);
+		return true;
+	}
+
+}

spring-integration-adapters/src/main/java/org/springframework/integration/adapter/event/MessagingEvent.java

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+/*
+ * Copyright 2002-2007 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.integration.adapter.event;
+
+import org.springframework.context.ApplicationEvent;
+import org.springframework.integration.message.Message;
+
+/**
+ * A subclass of {@link ApplicationEvent} that wraps a {@link Message}.
+ * 
+ * @author Mark Fisher
+ */
+public class MessagingEvent<T> extends ApplicationEvent {
+
+	public MessagingEvent(Message<T> message) {
+		super(message);
+	}
+
+	public Message<T> getMessage() {
+		return (Message<T>) this.getSource();
+	}
+
+}

spring-integration-adapters/src/main/java/org/springframework/integration/adapter/event/MessagingEventMapper.java

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+/*
+ * Copyright 2002-2007 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.integration.adapter.event;
+
+import org.springframework.integration.message.Message;
+import org.springframework.integration.message.MessageMapper;
+
+/**
+ * A {@link MessageMapper} implementation for mapping to and from
+ * {@link MessagingEvent MessagingEvents}.
+ * 
+ * @author Mark Fisher
+ */
+public class MessagingEventMapper<T> implements MessageMapper<T, MessagingEvent<T>> {
+
+	public MessagingEvent<T> fromMessage(Message<T> message) {
+		return new MessagingEvent<T>(message);
+	}
+
+	public Message<T> toMessage(MessagingEvent<T> event) {
+		return event.getMessage();
+	}
+
+}