Package com.sun.enterprise.ee.web.initialization

Source Code of com.sun.enterprise.ee.web.initialization.ReplicationLifecycleImpl

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* and Distribution License("CDDL") (collectively, the "License").  You
* may not use this file except in compliance with the License. You can obtain
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* or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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/*
* ReplicationLifecycleImpl.java
*
* Created on April 16, 2007, 3:11 PM
*
*/

package com.sun.enterprise.ee.web.initialization;

import com.sun.corba.ee.org.objectweb.asm.tree.analysis.Value;
import org.apache.catalina.LifecycleException;
import com.sun.appserv.server.ServerLifecycleException;
import com.sun.appserv.server.ServerLifecycleImpl;

import com.sun.enterprise.web.ServerConfigLookup;

import com.sun.enterprise.ee.web.sessmgmt.JxtaReplicationReceiver;
import com.sun.enterprise.ee.web.sessmgmt.ReplicationHealthChecker;
import com.sun.enterprise.ee.web.sessmgmt.ReplicationMessageRouter;
import com.sun.enterprise.ee.web.sessmgmt.ReplicationUtil;
import com.sun.enterprise.ee.web.sessmgmt.RollingUpgradeException;
import com.sun.enterprise.ee.web.sessmgmt.RollingUpgradeHandler;
import com.sun.enterprise.server.ServerContext;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
*
* @author Larry White
*/
public class ReplicationLifecycleImpl extends ServerLifecycleImpl {

    private static final long TEST_DURATION_SECONDS = 10 * 60L//10 minutes todo remove after testing
    private static final long TEST_DRAINTIME_SECONDS = 10L//10 seconds todo remove after testing
   
    public void onTermination() throws ServerLifecycleException {
        if(!isNativeReplicationEnabled()) {
            return;
        }
        JxtaReplicationReceiver jxtaReplicationReceiver
            = JxtaReplicationReceiver.createInstance();
        //System.out.println("ReplicationLifecycleImpl:about to call JxtaReplicationReceiver.stop()");
        try {
            jxtaReplicationReceiver.stop();
        } catch (LifecycleException ex) {}
    }
   
    /**
     * Server is shutting down applications
     *
     * @exception ServerLifecycleException if this subsystem detects a fatal
     *  error that prevents this subsystem from being used
     */
    public void onShutdown()
                        throws ServerLifecycleException {
        if(!isNativeReplicationEnabled()) {
            return;
        }
       
        //do not block this thread if the cluster as a whole is stopping
        //System.out.println("isClusterStopping: " + ReplicationHealthChecker.isClusterStopping());       
        if(ReplicationHealthChecker.isClusterStopping()) {
            return;
        }
        //do not block this thread if jxta pipes have never
        //been initialized this means no replication enabled app was
        //ever deployed since this server instance started
        ReplicationHealthChecker healthChecker = ReplicationHealthChecker.getInstance();
        if(!healthChecker.isPipeInitializationCalled()) {
            return;
        }
        //FIXME: this will be triggered from separate asadmin command
        //this is just for testing
        if(ReplicationUtil.isRollingUpgradeEnabled()) {
            try {
                RollingUpgradeHandler.backupSessionState(TEST_DURATION_SECONDS, TEST_DRAINTIME_SECONDS);
            } catch (RollingUpgradeException e) {
                e.printStackTrace()//To change body of catch statement use File | Settings | File Templates.
            }
        }
        int unloadWaitTime = getMaxSessionUnloadTimeInSeconds()//7 minutes by default
        //zero value means do not wait at all
        if(unloadWaitTime ==
                || !isRepairDuringFailure()
                || ReplicationUtil.isRollingUpgradeEnabled()) {
            return;
        }
        JxtaReplicationReceiver jxtaReplicationReceiver
            = JxtaReplicationReceiver.createInstance();
        //System.out.println("ReplicationLifecycleImpl:about to call JxtaReplicationReceiver.stop()");
        jxtaReplicationReceiver.repairOnCurrentThread();

        //FIXME for 9.1ur1 only do this if we have a background dispatcher
        //that we guarantee will call doneSignal.countdown()
        CountDownLatch doneSignal = ReplicationHealthChecker.getDoneSignal();
        ReplicationHealthChecker.setFlushThreadWaiting(true);
        try {
            doneSignal.await(unloadWaitTime, TimeUnit.SECONDS);
        } catch(InterruptedException ex) {
        } finally {
            ReplicationHealthChecker.setFlushThreadWaiting(false);
        }
    }

    /**
     * Server has complted loading the applications and is ready to serve requests.
     *
     * @param sc ServerContext the server runtime context.
     *
     * @exception ServerLifecycleException if this subsystem detects a fatal
     *  error that prevents this subsystem from being used
     */
    public void onReady(ServerContext sc) throws ServerLifecycleException {
        //FIXME: this will be triggered from separate asadmin command
        //this is just for testing       
        if(ReplicationUtil.isRollingUpgradeEnabled()) {
            try {
                RollingUpgradeHandler.restoreSessionState(TEST_DURATION_SECONDS);
            } catch (RollingUpgradeException e) {
                e.printStackTrace();
            }
            // put in when ready to test reconciliation
            try {
                RollingUpgradeHandler.reconcileSessionState(TEST_DURATION_SECONDS);
            } catch (RollingUpgradeException e) {
                e.printStackTrace();
            }
            //
        }
    }
   
     private boolean isNativeReplicationEnabled() {
         ServerConfigLookup lookup = new ServerConfigLookup();
         return lookup.isGMSEnabled() && lookup.isNativeReplicationEnabledFromConfig();
     }
    
     private int getMaxSessionUnloadTimeInSeconds() {
         ServerConfigLookup lookup = new ServerConfigLookup();
         return lookup.getMaxSessionUnloadTimeInSecondsPropertyFromConfig();
     }

     private boolean isRepairDuringFailure() {
         ServerConfigLookup lookup = new ServerConfigLookup();
         return lookup.isRepairDuringFailure();
     }   
   
}
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