Java tutorial
/* Licensed to Diennea S.r.l. under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. Diennea S.r.l. licenses this file to you 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 blazingcache.network.jvm; import blazingcache.network.Channel; import blazingcache.network.Message; import blazingcache.network.ReplyCallback; import blazingcache.network.SendResultCallback; import blazingcache.network.netty.DodoMessageUtils; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import java.util.Map; import java.util.UUID; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.RejectedExecutionException; import java.util.logging.Level; import java.util.logging.Logger; /** * In-JVM comunications * * @author enrico.olivelli */ public class JVMChannel extends Channel { private static final Logger LOGGER = Logger.getLogger(JVMChannel.class.getName()); private volatile boolean active = false; private final Map<String, ReplyCallback> pendingReplyMessages = new ConcurrentHashMap<>(); private final Map<String, Message> pendingReplyMessagesSource = new ConcurrentHashMap<>(); private JVMChannel otherSide; private final ExecutorService callbackexecutor = Executors.newCachedThreadPool(); private final ExecutorService executionserializer = Executors.newFixedThreadPool(1); private String id = UUID.randomUUID().toString(); @Override public String toString() { return "JVMChannel{" + "active=" + active + ", id=" + id + '}'; } public JVMChannel() { } private Message cloneMessage(Message message) { ByteBuf buf = Unpooled.buffer(); DodoMessageUtils.encodeMessage(buf, message); return DodoMessageUtils.decodeMessage(buf); } private void receiveMessageFromPeer(Message message) { final Message _message = cloneMessage(message); if (_message.getReplyMessageId() != null) { handleReply(_message); } else { submitCallback(() -> { try { messagesReceiver.messageReceived(_message); } catch (Throwable t) { LOGGER.log(Level.SEVERE, this + ": error " + t, t); close(); } }); } } public void setOtherSide(JVMChannel brokerSide) { this.otherSide = brokerSide; this.active = true; } @Override public void sendOneWayMessage(Message message, SendResultCallback callback) { message.setMessageId(UUID.randomUUID().toString()); Message _message = cloneMessage(message); // System.out.println("[JVM] sendOneWayMessage " + message); if (!active || executionserializer.isShutdown()) { return; } executionserializer.submit(() -> { otherSide.receiveMessageFromPeer(_message); submitCallback(() -> { callback.messageSent(_message, null); }); }); } private void handleReply(Message anwermessage) { final ReplyCallback callback = pendingReplyMessages.get(anwermessage.getReplyMessageId()); // System.out.println("[JVM] handleReply " + anwermessage + " callback=" + callback + ", pendingReplyMessages=" + pendingReplyMessages); if (callback != null) { pendingReplyMessages.remove(anwermessage.getReplyMessageId()); Message original = pendingReplyMessagesSource.remove(anwermessage.getReplyMessageId()); if (original != null) { submitCallback(() -> { callback.replyReceived(original, anwermessage, null); }); } } } @Override public void sendReplyMessage(Message inAnswerTo, Message message) { message.setMessageId(UUID.randomUUID().toString()); Message _message = cloneMessage(message); if (executionserializer.isShutdown()) { LOGGER.log(Level.SEVERE, "channel shutdown, discarding reply message " + _message); return; } executionserializer.submit(() -> { // System.out.println("[JVM] sendReplyMessage inAnswerTo=" + inAnswerTo.getMessageId() + " newmessage=" + message); if (!active) { LOGGER.log(Level.SEVERE, "channel not active, discarding reply message " + _message); return; } _message.setReplyMessageId(inAnswerTo.messageId); otherSide.receiveMessageFromPeer(_message); }); } private void submitCallback(Runnable r) { try { callbackexecutor.submit(r); } catch (RejectedExecutionException discard) { } } @Override public void sendMessageWithAsyncReply(Message message, long timeout, ReplyCallback callback) { message.setMessageId(UUID.randomUUID().toString()); Message _message = cloneMessage(message); if (executionserializer.isShutdown()) { LOGGER.log(Level.SEVERE, "[JVM] channel shutdown, discarding sendMessageWithAsyncReply"); return; } executionserializer.submit(() -> { // System.out.println("[JVM] sendMessageWithAsyncReply " + message); if (!active) { callbackexecutor.submit(() -> { callback.replyReceived(_message, null, new Exception("connection is not active")); }); return; } pendingReplyMessages.put(_message.getMessageId(), callback); pendingReplyMessagesSource.put(_message.getMessageId(), _message); otherSide.receiveMessageFromPeer(_message); }); } @Override public boolean isValid() { return active; } private volatile boolean closed = false; @Override public void close() { if (closed) { return; } closed = true; LOGGER.log(Level.SEVERE, this + ": closing"); active = false; pendingReplyMessages.forEach((key, callback) -> { submitCallback(() -> { Message original = pendingReplyMessagesSource.remove(key); if (original != null) { callback.replyReceived(original, null, new Exception("comunication channel closed")); } }); }); pendingReplyMessages.clear(); if (otherSide.active) { otherSide.close(); } executionserializer.shutdown(); callbackexecutor.shutdown(); messagesReceiver.channelClosed(); } @Override public void channelIdle() { } }