ml.shifu.guagua.io.HaltBytable Maven / Gradle / Ivy
/*
* Copyright [2013-2014] eBay Software Foundation
*
* 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 ml.shifu.guagua.io;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* Abstract {@link Bytable} implementation to read and store halt status.
*
*
* Halt status is used for master or worker result to determine whether the application should be terminated.
*
*
* By default master is the only one who has the right to stop the application if halt status in master result, no
* matter halt status in each worker is true.
*
*
* One switch in GuaguaConstants#GUAGUA_WORKER_HALT_ENABLE, if enabled, application will be terminated if all workers
* are halted no matter what is the master halt status.
*/
public abstract class HaltBytable implements Bytable {
/**
* Whether the master or worker is halt.
*/
private boolean isHalt;
/**
* Set status to halt if {@code isHalt} is true.
*/
public void setHalt(boolean isHalt) {
this.isHalt = isHalt;
}
/**
* Return halt status.
*/
public boolean isHalt() {
return this.isHalt;
}
@Override
public void write(DataOutput out) throws IOException {
out.writeBoolean(this.isHalt);
doWrite(out);
}
/**
* Write fields to out stream.
*/
public abstract void doWrite(DataOutput out) throws IOException;
@Override
public void readFields(DataInput in) throws IOException {
this.isHalt = in.readBoolean();
doReadFields(in);
}
/**
* Read fields from in stream.
*/
public abstract void doReadFields(DataInput in) throws IOException;
}