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...ssaging/src/main/java/org/springframework/messaging/simp/broker/OrderedMessageSender.java
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| /* | ||
| * Copyright 2002-2018 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.messaging.simp.broker; | ||
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| import java.util.Queue; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
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| import org.apache.commons.logging.Log; | ||
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| import org.springframework.messaging.Message; | ||
| import org.springframework.messaging.MessageChannel; | ||
| import org.springframework.messaging.MessageHandler; | ||
| import org.springframework.messaging.simp.SimpMessageHeaderAccessor; | ||
| import org.springframework.messaging.support.ExecutorChannelInterceptor; | ||
| import org.springframework.messaging.support.ExecutorSubscribableChannel; | ||
| import org.springframework.messaging.support.MessageHeaderAccessor; | ||
| import org.springframework.util.Assert; | ||
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| /** | ||
| * Submit messages to an ExecutorSubscribableChannel, one at a time. The channel | ||
| * must have been configured with {@link #configureOutboundChannel}. | ||
| * | ||
| * @author Rossen Stoyanchev | ||
| * @since 5.1 | ||
| */ | ||
| class OrderedMessageSender implements MessageChannel { | ||
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| static final String COMPLETION_TASK_HEADER = "simpSendCompletionTask"; | ||
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| private final MessageChannel channel; | ||
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| private final Log logger; | ||
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| private final Queue<Message<?>> messages = new ConcurrentLinkedQueue<>(); | ||
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| private final AtomicBoolean sendInProgress = new AtomicBoolean(false); | ||
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| public OrderedMessageSender(MessageChannel channel, Log logger) { | ||
| this.channel = channel; | ||
| this.logger = logger; | ||
| } | ||
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| public boolean send(Message<?> message) { | ||
| return send(message, -1); | ||
| } | ||
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| @Override | ||
| public boolean send(Message<?> message, long timeout) { | ||
| this.messages.add(message); | ||
| trySend(); | ||
| return true; | ||
| } | ||
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| private void trySend() { | ||
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| // Take sendInProgress flag only if queue is not empty | ||
| if (this.messages.isEmpty()) { | ||
| return; | ||
| } | ||
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| if (this.sendInProgress.compareAndSet(false, true)) { | ||
| sendNextMessage(); | ||
| } | ||
| } | ||
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| private void sendNextMessage() { | ||
| for (;;) { | ||
| Message<?> message = this.messages.poll(); | ||
| if (message != null) { | ||
| try { | ||
| addCompletionCallback(message); | ||
| if (this.channel.send(message)) { | ||
| return; | ||
| } | ||
| } | ||
| catch (Throwable ex) { | ||
| if (logger.isErrorEnabled()) { | ||
| logger.error("Failed to send " + message, ex); | ||
| } | ||
| } | ||
| } | ||
| else { | ||
| // We ran out of messages.. | ||
| this.sendInProgress.set(false); | ||
| trySend(); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| private void addCompletionCallback(Message<?> msg) { | ||
| SimpMessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(msg, SimpMessageHeaderAccessor.class); | ||
| Assert.isTrue(accessor != null && accessor.isMutable(), "Expected mutable SimpMessageHeaderAccessor"); | ||
| accessor.setHeader(COMPLETION_TASK_HEADER, (Runnable) this::sendNextMessage); | ||
| } | ||
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| /** | ||
| * Install or remove an {@link ExecutorChannelInterceptor} that invokes a | ||
| * completion task once the message is handled. | ||
| * @param channel the channel to configure | ||
| * @param preservePublishOrder whether preserve order is on or off based on | ||
| * which an interceptor is either added or removed. | ||
| */ | ||
| static void configureOutboundChannel(MessageChannel channel, boolean preservePublishOrder) { | ||
| if (preservePublishOrder) { | ||
| Assert.isInstanceOf(ExecutorSubscribableChannel.class, channel, | ||
| "An ExecutorSubscribableChannel is required for `preservePublishOrder`"); | ||
| ExecutorSubscribableChannel execChannel = (ExecutorSubscribableChannel) channel; | ||
| if (execChannel.getInterceptors().stream().noneMatch(i -> i instanceof CallbackInterceptor)) { | ||
| execChannel.addInterceptor(0, new CallbackInterceptor()); | ||
| } | ||
| } | ||
| else if (channel instanceof ExecutorSubscribableChannel) { | ||
| ExecutorSubscribableChannel execChannel = (ExecutorSubscribableChannel) channel; | ||
| execChannel.getInterceptors().stream().filter(i -> i instanceof CallbackInterceptor) | ||
| .findFirst() | ||
| .map(execChannel::removeInterceptor); | ||
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| } | ||
| } | ||
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| private static class CallbackInterceptor implements ExecutorChannelInterceptor { | ||
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| @Override | ||
| public void afterMessageHandled(Message<?> msg, MessageChannel ch, MessageHandler handler, Exception ex) { | ||
| Runnable task = (Runnable) msg.getHeaders().get(OrderedMessageSender.COMPLETION_TASK_HEADER); | ||
| if (task != null) { | ||
| task.run(); | ||
| } | ||
| } | ||
| } | ||
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| } |
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