KafkaTestBroker.java

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.storm.kafka;

import java.io.File;
import java.io.IOException;
import java.util.Properties;

import org.apache.commons.io.FileUtils;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.imps.CuratorFrameworkState;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.test.InstanceSpec;
import org.apache.curator.test.TestingServer;

import kafka.server.KafkaConfig;
import kafka.server.KafkaServerStartable;

/**
 * Date: 11/01/2014
 * Time: 13:15
 */
public class KafkaTestBroker {

  private int port;
  private KafkaServerStartable kafka;
  private TestingServer server;
  private CuratorFramework zookeeper;
  private File logDir;

  public KafkaTestBroker() {
    try {
      server = new TestingServer();
      String zookeeperConnectionString = server.getConnectString();
      ExponentialBackoffRetry retryPolicy = new ExponentialBackoffRetry(1000, 3);
      zookeeper = CuratorFrameworkFactory.newClient(zookeeperConnectionString, retryPolicy);
      zookeeper.start();
      port = InstanceSpec.getRandomPort();
      logDir = new File(System.getProperty("java.io.tmpdir"), "kafka/logs/kafka-test-" + port);
      KafkaConfig config = buildKafkaConfig(zookeeperConnectionString);
      kafka = new KafkaServerStartable(config);
      kafka.startup();
      // SUPPRESS CHECKSTYLE IllegalCatch
    } catch (Exception ex) {
      throw new RuntimeException("Could not start test broker", ex);
    }
  }

  private kafka.server.KafkaConfig buildKafkaConfig(String zookeeperConnectionString) {
    Properties p = new Properties();
    p.setProperty("zookeeper.connect", zookeeperConnectionString);
    p.setProperty("broker.id", "0");
    p.setProperty("port", "" + port);
    p.setProperty("log.dirs", logDir.getAbsolutePath());
    return new KafkaConfig(p);
  }

  public String getBrokerConnectionString() {
    return "localhost:" + port;
  }

  public int getPort() {
    return port;
  }

  public void shutdown() {
    if (kafka != null) {
      kafka.shutdown();
      kafka.awaitShutdown();
    }
    //Ensure kafka server is eligible for garbage collection immediately
    kafka = null;
    if (zookeeper.getState().equals(CuratorFrameworkState.STARTED)) {
      zookeeper.close();
    }
    try {
      server.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
    FileUtils.deleteQuietly(logDir);
  }
}