org.apache.hadoop.yarn.event.AbstractEvent.java Source code

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Here is the source code for org.apache.hadoop.yarn.event.AbstractEvent.java

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/**
* 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 org.apache.hadoop.yarn.event;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Evolving;

/**
 * Parent class of all the events. All events extend this class.
 */
@Public
@Evolving
public abstract class AbstractEvent<TYPE extends Enum<TYPE>> implements Event<TYPE> {

    private final TYPE type;
    private final long timestamp;

    // use this if you DON'T care about the timestamp
    public AbstractEvent(TYPE type) {
        this.type = type;
        // We're not generating a real timestamp here.  It's too expensive.
        timestamp = -1L;
    }

    // use this if you care about the timestamp
    public AbstractEvent(TYPE type, long timestamp) {
        this.type = type;
        this.timestamp = timestamp;
    }

    @Override
    public long getTimestamp() {
        return timestamp;
    }

    @Override
    public TYPE getType() {
        return type;
    }

    @Override
    public String toString() {
        return "EventType: " + getType();
    }
}