Add messaging.channel package
This commit is contained in:
Rossen Stoyanchev
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/*
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* Copyright 2002-2013 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.messaging.channel;
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import java.util.Set;
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import java.util.concurrent.CopyOnWriteArraySet;
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import java.util.concurrent.Executor;
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import org.springframework.messaging.Message;
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import org.springframework.messaging.MessageHandler;
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import org.springframework.messaging.SubscribableChannel;
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import org.springframework.util.Assert;
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/**
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* A {@link SubscribableChannel} that sends messages to each of its subscribers. For a
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* more feature complete implementation consider
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* {@code org.springframework.integration.channel.PublishSubscribeChannel} from the
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* Spring Integration project.
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*
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* @author Phillip Webb
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* @since 4.0
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*/
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public class PublishSubscribeChannel implements SubscribableChannel {
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private Executor executor;
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private Set<MessageHandler> handlers = new CopyOnWriteArraySet<MessageHandler>();
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/**
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* Create a new {@link PublishSubscribeChannel} instance where messages will be sent
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* in the callers thread.
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*/
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public PublishSubscribeChannel() {
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this(null);
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}
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/**
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* Create a new {@link PublishSubscribeChannel} instance where messages will be sent
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* via the specified executor.
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* @param executor the executor used to send the message or {@code null} to execute in
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* the callers thread.
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*/
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public PublishSubscribeChannel(Executor executor) {
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this.executor = executor;
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}
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@Override
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public boolean send(Message<?> message) {
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return send(message, INDEFINITE_TIMEOUT);
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}
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@Override
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public boolean send(Message<?> message, long timeout) {
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Assert.notNull(message, "Message must not be null");
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Assert.notNull(message.getPayload(), "Message payload must not be null");
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for (final MessageHandler handler : this.handlers) {
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dispatchToHandler(message, handler);
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}
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return true;
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}
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private void dispatchToHandler(final Message<?> message, final MessageHandler handler) {
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if (this.executor == null) {
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handler.handleMessage(message);
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}
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else {
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this.executor.execute(new Runnable() {
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@Override
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public void run() {
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handler.handleMessage(message);
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}
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});
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}
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}
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@Override
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public boolean subscribe(MessageHandler handler) {
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return this.handlers.add(handler);
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}
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@Override
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public boolean unsubscribe(MessageHandler handler) {
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return this.handlers.remove(handler);
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}
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}
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@@ -0,0 +1,141 @@
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/*
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* Copyright 2002-2013 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.messaging.channel;
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import java.util.HashMap;
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import java.util.Map;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.messaging.Message;
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import org.springframework.messaging.MessageHandler;
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import org.springframework.messaging.SubscribableChannel;
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import reactor.core.Reactor;
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import reactor.fn.Consumer;
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import reactor.fn.Event;
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import reactor.fn.registry.Registration;
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import reactor.fn.selector.ObjectSelector;
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/**
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* @author Rossen Stoyanchev
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* @since 4.0
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*/
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public class ReactorMessageChannel implements SubscribableChannel {
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private static Log logger = LogFactory.getLog(ReactorMessageChannel.class);
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private final Reactor reactor;
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private final Object key = new Object();
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private String name = toString(); // TODO
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private final Map<MessageHandler, Registration<?>> registrations =
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new HashMap<MessageHandler, Registration<?>>();
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public ReactorMessageChannel(Reactor reactor) {
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this.reactor = reactor;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getName() {
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return this.name;
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}
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@Override
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public boolean send(Message<?> message) {
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return send(message, -1);
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}
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@Override
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public boolean send(Message<?> message, long timeout) {
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if (logger.isTraceEnabled()) {
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logger.trace("Channel " + getName() + ", sending message id=" + message.getHeaders().getId());
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}
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this.reactor.notify(this.key, Event.wrap(message));
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return true;
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}
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@Override
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public boolean subscribe(final MessageHandler handler) {
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if (this.registrations.containsKey(handler)) {
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logger.warn("Channel " + getName() + ", handler already subscribed " + handler);
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return false;
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}
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if (logger.isTraceEnabled()) {
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logger.trace("Channel " + getName() + ", subscribing handler " + handler);
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}
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Registration<Consumer<Event<Message<?>>>> registration = this.reactor.on(
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ObjectSelector.objectSelector(key), new MessageHandlerConsumer(handler));
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this.registrations.put(handler, registration);
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return true;
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}
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@Override
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public boolean unsubscribe(MessageHandler handler) {
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if (logger.isTraceEnabled()) {
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logger.trace("Channel " + getName() + ", removing subscription for handler " + handler);
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}
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Registration<?> registration = this.registrations.remove(handler);
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if (registration == null) {
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if (logger.isTraceEnabled()) {
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logger.trace("Channel " + getName() + ", no subscription for handler " + handler);
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}
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return false;
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}
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registration.cancel();
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return true;
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}
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private static final class MessageHandlerConsumer implements Consumer<Event<Message<?>>> {
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private final MessageHandler handler;
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private MessageHandlerConsumer(MessageHandler handler) {
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this.handler = handler;
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}
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@Override
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public void accept(Event<Message<?>> event) {
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Message<?> message = event.getData();
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try {
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this.handler.handleMessage(message);
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}
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catch (Throwable t) {
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// TODO
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logger.error("Failed to process message " + message, t);
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}
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}
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}
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}
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