ConsumerPauseRequestProcessor.java

package com.linkedin.databus.client.generic;
/*
 *
 * Copyright 2013 LinkedIn Corp. All rights reserved
 *
 * 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.
 *
*/


import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.concurrent.ExecutorService;

import org.apache.log4j.Logger;

import com.linkedin.databus2.core.container.request.DatabusRequest;
import com.linkedin.databus2.core.container.request.InvalidRequestParamValueException;
import com.linkedin.databus2.core.container.request.RequestProcessingException;
import com.linkedin.databus2.core.container.request.RequestProcessor;

/**
 * Interfact to pause the consumer for testing purpose
 * @author dzhang
 *
 */
public class ConsumerPauseRequestProcessor implements RequestProcessor
{

  public static final String MODULE = ConsumerPauseRequestProcessor.class.getName();
  public static final Logger LOG = Logger.getLogger(MODULE);

  public static final String COMMAND_NAME = "pauseConsumer";

  private final ExecutorService _executorService;
  private final DatabusConsumerPauseInterface _pauseConsumer;

  public ConsumerPauseRequestProcessor(ExecutorService executorService,
                                            DatabusConsumerPauseInterface pauseConsumer)
  {
    super();
    _executorService = executorService;
    _pauseConsumer = pauseConsumer;
  }

  @Override
  public ExecutorService getExecutorService()
  {
    return _executorService;
  }

  @Override
  public DatabusRequest process(DatabusRequest request) throws IOException,
      RequestProcessingException
  {
    String action = request.getParams().getProperty(DatabusRequest.PATH_PARAM_NAME, "");
    if (action.equals("pause"))
    {
      _pauseConsumer.pause();
      request.getResponseContent().write(ByteBuffer.wrap("{\"pauseConsumer\":\"set-pause\"}".getBytes(Charset.defaultCharset())));
    }
    else if (action.equals("resume"))
    {
      _pauseConsumer.resume();
      request.getResponseContent().write(ByteBuffer.wrap("{\"pauseConsumer\":\"set-resume\"}".getBytes(Charset.defaultCharset())));
    }
    else
    {
      throw new InvalidRequestParamValueException(COMMAND_NAME, "request path", action);
    }
    return request;
  }

}