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/*
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 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 */

package org.glassfish.ha.store.adapter.cache;

import java.io.Serializable;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.inject.Inject;

import org.glassfish.api.StartupRunLevel;
import org.glassfish.api.event.EventListener;
import org.glassfish.api.event.EventTypes;
import org.glassfish.api.event.Events;
import org.glassfish.ha.store.api.BackingStore;
import org.glassfish.ha.store.api.BackingStoreConfiguration;
import org.glassfish.ha.store.api.BackingStoreException;
import org.glassfish.ha.store.api.BackingStoreFactory;
import org.glassfish.ha.store.api.BackingStoreTransaction;
import org.glassfish.ha.store.spi.BackingStoreFactoryRegistry;
import org.glassfish.hk2.api.PostConstruct;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.runlevel.RunLevel;
import org.jvnet.hk2.annotations.Service;

/**
 * @author Mahesh Kannan
 */
@Service(name = "replicated")
@RunLevel(StartupRunLevel.VAL)
public class ShoalBackingStoreProxy
        implements PostConstruct, BackingStoreFactory {

    @Inject
    ServiceLocator habitat;

    @Inject
    Events events;

    @Override
    public  BackingStore createBackingStore(BackingStoreConfiguration conf) throws BackingStoreException {
        try {
            BackingStoreFactory storeFactory = habitat.getService(BackingStoreFactory.class, "shoal-backing-store-factory");
            return storeFactory.createBackingStore(conf);
        } catch (IllegalStateException ex) {
            String msg = "ReplicatedBackingStore requires GMS to be running in the target cluster before the application is deployed. ";
            throw new BackingStoreException("Exception while creating replicated BackingStore. " + msg, ex);
        } catch (Exception ex) {
            throw new BackingStoreException("Exception while creating shoal cache", ex);
        }
    }

    @Override
    public void postConstruct() {
        BackingStoreFactoryRegistry.register("replicated", this);
        Logger.getLogger(ShoalBackingStoreProxy.class.getName()).log(Level.FINE, "Registered SHOAL BackingStore Proxy with persistence-type = replicated");
        EventListener glassfishEventListener = new EventListener() {
            @Override
            public void event(Event event) {
                if (event.is(EventTypes.SERVER_SHUTDOWN)) {
                    BackingStoreFactoryRegistry.unregister("replicated");
                    Logger.getLogger(ShoalBackingStoreProxy.class.getName()).log(Level.FINE, "Unregistered SHOAL BackingStore Proxy with persistence-type = replicated");
                } // else if (event.is(EventTypes.SERVER_READY)) {  }
            }
        };
        events.register(glassfishEventListener);
    }

    @Override
    public BackingStoreTransaction createBackingStoreTransaction() {
        try {
            BackingStoreFactory storeFactory = habitat.getService(BackingStoreFactory.class, "shoal-backing-store-factory");
            return storeFactory.createBackingStoreTransaction();
        } catch (Exception ex) {
            //FIXME avoid runtime exception
            throw new RuntimeException("Exception while creating shoal cache", ex);
        }
    }
}