KaaLoadChannelSelector.java

/*
 * Copyright 2014 CyberVision, Inc.
 *
 * 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 org.kaaproject.kaa.server.flume.channel;

import org.apache.flume.Channel;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.channel.AbstractChannelSelector;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class KaaLoadChannelSelector extends AbstractChannelSelector {

  private List<Channel> allChannels = null;
  private List<Channel> optionalChannels = new ArrayList<Channel>();

  private int currentChannel = 0;

  @Override
  public List<Channel> getRequiredChannels(Event event) {
    Channel channel = allChannels.get(currentChannel);
    currentChannel++;
    if (currentChannel == allChannels.size()) {
      currentChannel = 0;
    }
    return Collections.singletonList(channel);
  }

  @Override
  public List<Channel> getOptionalChannels(Event event) {
    return optionalChannels;
  }

  @Override
  public void configure(Context context) {
    allChannels = getAllChannels();
  }

}