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From huafengw <...@git.apache.org>
Subject [GitHub] incubator-gearpump pull request #178: [GEARPUMP-303] add a RabbitMQ sink to ...
Date Fri, 05 May 2017 09:46:36 GMT
Github user huafengw commented on a diff in the pull request:

    https://github.com/apache/incubator-gearpump/pull/178#discussion_r114957864
  
    --- Diff: external/rabbitmq/src/main/scala/org/apache/gearpump/external/rabbitmq/RMQSink.scala
---
    @@ -0,0 +1,177 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF 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 org.apache.gearpump.external.rabbitmq
    +
    +import org.apache.gearpump.Message
    +import org.apache.gearpump.cluster.UserConfig
    +import org.apache.gearpump.streaming.sink.DataSink
    +import org.apache.gearpump.streaming.task.TaskContext
    +import com.rabbitmq.client.Channel
    +import com.rabbitmq.client.{Connection, ConnectionFactory}
    +
    +class RMQSink(userConfig: UserConfig) extends DataSink{
    +
    +  var connection: Connection = null
    +  var channel: Channel = null
    +  var queueName: String = null
    +
    +  override def open(context: TaskContext): Unit = {
    +    val factory : ConnectionFactory = RMQSink.getConnectionFactory(userConfig)
    +    connection = factory.newConnection
    +    channel = connection.createChannel
    +    if (channel == null) {
    +      throw new RuntimeException("None of RabbitMQ channels are available.")
    +    }
    +    setupQueue()
    +  }
    +
    +  override def write(message: Message): Unit = {
    +    publish(message.msg)
    +  }
    +
    +  override def close(): Unit = {
    +    channel.close()
    +    connection.close()
    +  }
    +
    +  protected def setupQueue(): Unit = {
    +    val queue = RMQSink.getQueueName(userConfig)
    +    if (!queue.nonEmpty) {
    +      throw new RuntimeException("can not get a RabbitMQ queue name")
    +    }
    +
    +    queueName = queue.get
    +    channel.queueDeclare(queue.get, false, false, false, null)
    +  }
    +
    +  def publish(msg: Any): Unit = {
    +    msg match {
    +      case seq: Seq[Any] =>
    +        seq.foreach(publish)
    +      case str: String => {
    +        channel.basicPublish("", queueName, null, msg.asInstanceOf[String].getBytes)
    +      }
    +      case byteArray: Array[Byte@unchecked] => {
    --- End diff --
    
    is `unchecked` annotation needed here?


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