org.kchine.rpf.db.ServantsProviderFactoryDBProxy.java Source code

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Here is the source code for org.kchine.rpf.db.ServantsProviderFactoryDBProxy.java

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/*
 * Biocep: R-based Platform for Computational e-Science.
 *
 * Copyright (C) 2007-2009 Karim Chine - karim.chine@m4x.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kchine.rpf.db;

import java.rmi.registry.Registry;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import org.apache.commons.logging.Log;
import org.kchine.rpf.ManagedServant;
import org.kchine.rpf.ServantProvider;
import org.kchine.rpf.ServantProviderFactory;
import org.kchine.rpf.TimeoutException;
import org.kchine.rpf.db.DBLayerInterface;
import org.kchine.rpf.db.PoolDataDB;

/**
 * @author Karim Chine karim.chine@m4x.org
 */
public class ServantsProviderFactoryDBProxy extends ServantProviderFactory {

    private final Log log = org.apache.commons.logging.LogFactory.getLog(ServantsProviderFactoryDBProxy.class);
    private ServantProvider _servantProvider = null;
    private HashMap<String, PoolDataDB> _poolHashMap = new HashMap<String, PoolDataDB>();
    private String _defaultPoolName;
    private DBLayerInterface _dbLayer = null;

    public ServantsProviderFactoryDBProxy() throws Exception {
        super();

        _dbLayer = ((DBLayerProvider) Class.forName(System.getProperty("pools.dbproxymode.class")).newInstance())
                .getDBLayer();
        _defaultPoolName = System.getProperty("pools.dbproxymode.defaultpoolname");

        _poolHashMap = _dbLayer.getPoolDataHashMap();
        _servantProvider = new ServantProvider() {

            public ManagedServant borrowServantProxy(String poolName) throws TimeoutException {

                ManagedServant proxy = null;
                long tstart = System.currentTimeMillis();
                do {
                    try {
                        proxy = (ManagedServant) ServantProxyPoolSingletonDB.getInstance(poolName, _dbLayer)
                                .borrowObject();
                    } catch (NoSuchElementException e) {
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }

                    if (proxy != null) {
                        try {
                            // log .info("<" + Thread.currentThread().getName()+
                            // "> obtained resource : "+
                            // proxy.getServantName());
                        } catch (Exception e) {
                        }
                        break;
                    } else {

                    }

                    if (System.currentTimeMillis() - tstart > _poolHashMap.get(poolName).getBorrowTimeout())
                        throw new TimeoutException();
                    try {
                        Thread.sleep(20);
                    } catch (Exception e) {
                    }

                    // log.info("<" + Thread.currentThread().getName() + ">
                    // thread waiting for resource for : "+
                    // ((System.currentTimeMillis() - tstart) / 1000)+ "
                    // seconds");

                } while (true);

                return proxy;
            }

            public ManagedServant borrowServantProxyNoWait(String poolName) {
                ManagedServant proxy = null;
                try {
                    proxy = (ManagedServant) ServantProxyPoolSingletonDB.getInstance(poolName, _dbLayer)
                            .borrowObject();
                } catch (NoSuchElementException e) {
                } catch (Exception ex) {
                    ex.printStackTrace();
                }

                return proxy;
            }

            public void returnServantProxy(ManagedServant proxy) {
                if (proxy == null)
                    return;
                try {

                    ServantProxyPoolSingletonDB.getInstance(_defaultPoolName, _dbLayer).returnObject(proxy);
                } catch (Exception e) {
                    e.printStackTrace();
                    System.exit(0);
                }
            }

            public void returnServantProxy(String poolName, ManagedServant proxy) {
                if (proxy == null)
                    return;
                try {

                    ServantProxyPoolSingletonDB.getInstance(poolName, _dbLayer).returnObject(proxy);
                } catch (Exception e) {
                    e.printStackTrace();
                    System.exit(0);
                }
            }

            public ManagedServant borrowServantProxy() throws TimeoutException {
                return borrowServantProxy(_defaultPoolName);
            }

            public ManagedServant borrowServantProxyNoWait() {
                return borrowServantProxyNoWait(_defaultPoolName);
            }

            public String getDefaultPoolName() {
                return _defaultPoolName;
            }

            public Registry getRegistry() {
                return _dbLayer;
            }

        };

    }

    @Override
    public ServantProvider getServantProvider() {
        return _servantProvider;
    }

}