org.apache.tajo.master.session.SessionLivelinessMonitor.java Source code

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Here is the source code for org.apache.tajo.master.session.SessionLivelinessMonitor.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.tajo.master.session;

import com.google.common.base.Preconditions;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.event.Dispatcher;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.util.AbstractLivelinessMonitor;
import org.apache.hadoop.yarn.util.SystemClock;
import org.apache.tajo.conf.TajoConf;

public class SessionLivelinessMonitor extends AbstractLivelinessMonitor<String> {

    private EventHandler dispatcher;

    public SessionLivelinessMonitor(Dispatcher d) {
        super(SessionLivelinessMonitor.class.getSimpleName(), new SystemClock());
        this.dispatcher = d.getEventHandler();
    }

    public void serviceInit(Configuration conf) throws Exception {
        Preconditions.checkArgument(conf instanceof TajoConf);
        TajoConf systemConf = (TajoConf) conf;

        // seconds
        int expireIntvl = systemConf.getIntVar(TajoConf.ConfVars.$CLIENT_SESSION_EXPIRY_TIME);
        setExpireInterval(expireIntvl);
        setMonitorInterval(expireIntvl / 3);
        super.serviceInit(conf);
    }

    @Override
    protected void expire(String id) {
        dispatcher.handle(new SessionEvent(id, SessionEventType.EXPIRE));
    }
}