/**
* 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 com.alibaba.jstorm.callback;
import java.util.Map;
import java.util.Set;
import org.jboss.netty.channel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import backtype.storm.utils.DisruptorQueue;
import com.alibaba.jstorm.message.netty.NettyServerFlowCtrlHandler;
public class BackpressureCallback implements Callback {
private static final Logger LOG = LoggerFactory.getLogger(BackpressureCallback.class);
private NettyServerFlowCtrlHandler handler;
private int taskId;
public BackpressureCallback(NettyServerFlowCtrlHandler handler, int taskId) {
this.taskId = taskId;
this.handler = handler;
}
public <T> Object execute(T... args) {
DisruptorQueue queue = (DisruptorQueue) args[0];
if (handler.checkIfUnderFlowCtrl(queue)) {
try {
handler.releaseFlowCtrl(taskId);
} catch (InterruptedException e) {
LOG.warn("Failed to release flow control for task-{}", taskId);
return false;
}
return true;
} else {
return false;
}
}
}