| // Copyright (C) 2013 The Android Open Source Project |
| // |
| // 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 com.googlesource.gerrit.plugins.rabbitmq; |
| |
| import com.google.inject.Inject; |
| import com.rabbitmq.client.AMQP.BasicProperties; |
| import com.rabbitmq.client.Channel; |
| import com.rabbitmq.client.Connection; |
| import com.rabbitmq.client.ConnectionFactory; |
| import com.rabbitmq.client.DefaultConsumer; |
| import com.rabbitmq.client.Envelope; |
| import com.rabbitmq.client.ShutdownListener; |
| import com.rabbitmq.client.ShutdownSignalException; |
| |
| import org.apache.commons.codec.CharEncoding; |
| import org.apache.commons.lang.StringUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.net.URISyntaxException; |
| |
| public class AMQPSession implements ShutdownListener { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(AMQPSession.class); |
| private final Properties properties; |
| private Connection connection; |
| private Channel publishChannel; |
| private Channel consumeChannel; |
| private volatile int failureCount = 0; |
| |
| @Inject |
| public AMQPSession(Properties properties) { |
| this.properties = properties; |
| } |
| |
| public boolean isOpen() { |
| if (connection != null) { |
| return true; |
| } |
| return false; |
| } |
| |
| private Channel getChannel() { |
| Channel ch = null; |
| if (connection == null) { |
| connect(); |
| } |
| if (connection != null) { |
| try { |
| ch = connection.createChannel(); |
| ch.addShutdownListener(this); |
| failureCount = 0; |
| } catch (Exception ex) { |
| LOGGER.warn("Failed to open publish channel."); |
| failureCount++; |
| } |
| if (failureCount > properties.getInt(Keys.MONITOR_FAILURECOUNT)) { |
| LOGGER.warn("Connection has something wrong. So will be disconnected."); |
| disconnect(); |
| } |
| } |
| return ch; |
| } |
| |
| public void connect() { |
| LOGGER.info("Connect to {}...", properties.getString(Keys.AMQP_URI)); |
| ConnectionFactory factory = new ConnectionFactory(); |
| try { |
| if (StringUtils.isNotEmpty(properties.getString(Keys.AMQP_URI))) { |
| factory.setUri(properties.getString(Keys.AMQP_URI)); |
| if (StringUtils.isNotEmpty(properties.getString(Keys.AMQP_USERNAME))) { |
| factory.setUsername(properties.getString(Keys.AMQP_USERNAME)); |
| } |
| if (StringUtils.isNotEmpty(properties.getString(Keys.AMQP_PASSWORD))) { |
| factory.setPassword(properties.getString(Keys.AMQP_PASSWORD)); |
| } |
| connection = factory.newConnection(); |
| connection.addShutdownListener(this); |
| LOGGER.info("Connection established."); |
| } |
| setUp(); |
| } catch (URISyntaxException ex) { |
| LOGGER.error("URI syntax error: {}", properties.getString(Keys.AMQP_URI)); |
| } catch (IOException ex) { |
| LOGGER.error("Connection cannot be opened."); |
| } catch (Exception ex) { |
| LOGGER.warn("Connection has something error. it will be disposed.", ex); |
| } |
| } |
| |
| private void setUp() { |
| if (connection != null) { |
| if (properties.getBoolean(Keys.QUEUE_CONSUME)) { |
| if (StringUtils.isNotEmpty(properties.getString(Keys.QUEUE_NAME))) { |
| consumeMessage(); |
| } |
| } |
| LOGGER.info("Complete to setup channel."); |
| } |
| } |
| |
| public void disconnect() { |
| LOGGER.info("Disconnecting..."); |
| try { |
| if (connection != null) { |
| connection.close(); |
| } |
| } catch (Exception ex) { |
| LOGGER.warn("Error when close connection." , ex); |
| } finally { |
| connection = null; |
| publishChannel = null; |
| } |
| } |
| |
| public void publishMessage(String message) { |
| if (publishChannel == null || !publishChannel.isOpen()) { |
| publishChannel = getChannel(); |
| } |
| if (publishChannel != null && publishChannel.isOpen()) { |
| try { |
| LOGGER.debug("Send message."); |
| publishChannel.basicPublish(properties.getString(Keys.EXCHANGE_NAME), |
| properties.getString(Keys.MESSAGE_ROUTINGKEY), |
| properties.getBasicProperties(), |
| message.getBytes(CharEncoding.UTF_8)); |
| } catch (Exception ex) { |
| LOGGER.warn("Error when sending meessage.", ex); |
| } |
| } |
| } |
| |
| public void consumeMessage() { |
| if (consumeChannel == null || !consumeChannel.isOpen()) { |
| consumeChannel = getChannel(); |
| } |
| if (consumeChannel != null && consumeChannel.isOpen()) { |
| try { |
| consumeChannel.basicConsume( |
| properties.getString(Keys.QUEUE_NAME), |
| false, |
| new MessageConsumer(consumeChannel)); |
| LOGGER.debug("Start consuming message."); |
| } catch (Exception ex) { |
| LOGGER.warn("Error when consuming message.", ex); |
| } |
| } |
| } |
| |
| @Override |
| public void shutdownCompleted(ShutdownSignalException exception) { |
| Object obj = exception.getReference(); |
| |
| if (obj instanceof Channel) { |
| Channel ch = (Channel) obj; |
| if (ch.equals(publishChannel)) { |
| LOGGER.info("Publish channel closed."); |
| publishChannel = null; |
| } else if (ch.equals(consumeChannel)) { |
| LOGGER.info("Consume channel closed."); |
| consumeChannel = null; |
| } |
| } else if (obj instanceof Connection) { |
| LOGGER.info("Connection disconnected."); |
| connection = null; |
| } |
| } |
| |
| public class MessageConsumer extends DefaultConsumer { |
| |
| public MessageConsumer(Channel channel) { |
| super(channel); |
| } |
| |
| @Override |
| public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties props, byte[] body) |
| throws IOException { |
| try { |
| long deliveryTag = envelope.getDeliveryTag(); |
| |
| if (Properties.APPROVE_APPID.equals(props.getAppId()) && |
| Properties.CONTENT_TYPE_JSON.equals(props.getContentType())) { |
| // TODO: Get message then input as review. required 2.9 or later. |
| } |
| |
| getChannel().basicAck(deliveryTag, false); |
| |
| } catch (IOException ex) { |
| throw ex; |
| } catch (RuntimeException ex) { |
| LOGGER.warn("caught exception in delivery handler", ex); |
| } |
| } |
| } |
| } |