com.srotya.tau.nucleus.disruptor.GroupByHandler Maven / Gradle / Ivy
/**
* Copyright 2016 Ambud Sharma
*
* 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.srotya.tau.nucleus.disruptor;
import com.lmax.disruptor.EventHandler;
import com.srotya.tau.wraith.Constants;
import com.srotya.tau.wraith.Event;
import com.srotya.tau.wraith.MurmurHash;
import com.srotya.tau.wraith.MutableInt;
/**
*
*
* @author ambudsharma
*/
public abstract class GroupByHandler implements EventHandler {
private int taskId;
private MutableInt taskCount;
/**
* @param taskId
*/
public GroupByHandler(int taskId, MutableInt taskCount) {
this.taskId = taskId;
this.taskCount = taskCount;
}
@Override
public void onEvent(Event event, long sequence, boolean endOfBatch) throws Exception {
Object key = event.getHeaders().get(Constants.FIELD_AGGREGATION_KEY);
if (key != null) {
if (MurmurHash.hash32(key.toString()) % taskCount.getVal() == taskId) {
consumeEvent(event, sequence, endOfBatch);
}
}else {
//broadcast events
consumeEvent(event, sequence, endOfBatch);
}
}
/**
* Consume event
*
* @param event
* @param sequence
* @param endOfBatch
* @throws Exception
*/
public abstract void consumeEvent(Event event, long sequence, boolean endOfBatch) throws Exception;
/**
* @return taskId
*/
public int getTaskId() {
return taskId;
}
}