package org.csc.phynixx.connection;
   
   /*
    * #%L
    * phynixx-connection
    * %%
    * Copyright (C) 2014 csc
    * %%
    * Licensed 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.
   * #L%
   */
  
  
  import org.apache.commons.pool2.BasePooledObjectFactory;
  import org.apache.commons.pool2.PooledObject;
  import org.apache.commons.pool2.PooledObjectFactory;
  import org.apache.commons.pool2.impl.DefaultPooledObject;
  import org.apache.commons.pool2.impl.GenericObjectPool;
  import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
  import org.csc.phynixx.common.exceptions.DelegatedRuntimeException;
  import org.csc.phynixx.common.logger.IPhynixxLogger;
  import org.csc.phynixx.common.logger.PhynixxLogManager;
  
  /**
   * Factory pools the pure connection. before delivering the connection it ist decorate by the according to {@link PhynixxManagedConnectionFactory}.
   *
   * @param <C> Typ of the pure connection
   */
  public class PooledPhynixxManagedConnectionFactory<C extends IPhynixxConnection> extends PhynixxManagedConnectionFactory<C> {
  
  
      private static final IPhynixxLogger LOG = PhynixxLogManager.getLogger(PooledPhynixxManagedConnectionFactory.class);
  
      private GenericObjectPool<IPhynixxManagedConnection<C>> genericObjectPool = null;
  
      /**
       * implementation of the contract of generic pools to manage pooled elements
       *
       * @author christoph
       */
      private static class MyPoolableObjectFactory<X extends IPhynixxConnection> extends BasePooledObjectFactory<IPhynixxManagedConnection<X>> implements PooledObjectFactory<IPhynixxManagedConnection<X>> {
  
          PooledPhynixxManagedConnectionFactory<X> managedConnectionFactory;
  
          private MyPoolableObjectFactory(PooledPhynixxManagedConnectionFactory<X> managedConnectionFactory) {
              this.managedConnectionFactory = managedConnectionFactory;
          }
  
          public void activateObject(PooledObject<IPhynixxManagedConnection<X>> obj) throws Exception {
              // opens the connection
              //bobj.getObject().reset();
              if (LOG.isDebugEnabled()) {
                  LOG.debug("Activated " + obj);
              }
              obj.getObject().reopen();
          }
  
          public void destroyObject(PooledObject<IPhynixxManagedConnection<X>> obj) throws Exception {
              IPhynixxManagedConnection<X> ch = obj.getObject();
              ch.free();
          }
  
          @Override
          public IPhynixxManagedConnection<X> create() throws Exception {
              return this.managedConnectionFactory.instantiateConnection();
          }
  
          @Override
          public PooledObject<IPhynixxManagedConnection<X>> wrap(IPhynixxManagedConnection<X> obj) {
              return new DefaultPooledObject<IPhynixxManagedConnection<X>>(obj);
          }
  
          public void passivateObject(PooledObject<IPhynixxManagedConnection<X>> obj) throws Exception {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("Passivated " + obj.getObject());
              }
              obj.getObject().reset();
          }
  
          public boolean validateObject(PooledObject<IPhynixxManagedConnection<X>> obj) {
              return obj.getObject() != null && !(obj.getObject().isClosed());
          }
  
      }
  
      public PooledPhynixxManagedConnectionFactory() {
          super();
      }
  
 
     public PooledPhynixxManagedConnectionFactory(IPhynixxConnectionFactory connectionFactory) {
         this(connectionFactory, null);
     }
 
     public PooledPhynixxManagedConnectionFactory(IPhynixxConnectionFactory<C> connectionFactory,
                                                  GenericObjectPoolConfig genericPoolConfig) {
         super(connectionFactory);
         GenericObjectPoolConfig cfg = genericPoolConfig;
         if (cfg == null) {
             cfg = new GenericObjectPoolConfig();
         }
         this.genericObjectPool = new GenericObjectPool(new MyPoolableObjectFactory<C>(this), cfg);
 
         this.setCloseStrategy(new PooledConnectionCloseStrategy<C>());
     }
 
     /**
      * closes the current pool -if existing- and instanciates a new pool
      *
      * @param cfg
      * @throws Exception
      */
     public void setGenericPoolConfig(GenericObjectPoolConfig cfg) throws Exception {
         if (this.genericObjectPool != null) {
             this.genericObjectPool.close();
         }
         if (cfg == null) {
             cfg = new GenericObjectPoolConfig();
         }
         this.genericObjectPool = new GenericObjectPool(new MyPoolableObjectFactory<C>(this), cfg);
     }
 
     @Override
     public IPhynixxManagedConnection<C> getManagedConnection() {
         try {
             // System.out.println(Thread.currentThread()+"borrowObject "+this.genericObjectPool.getNumIdle()+"/"+this.genericObjectPool.getNumActive()+ "(Waiters "+this.genericObjectPool.getNumWaiters()+")");
             return this.genericObjectPool.borrowObject();
         } catch (Throwable e) {
             throw new DelegatedRuntimeException("Instantiating new pooled Proxy", e);
         }
     }
 
     /**
      * closes the connection an releases it to the pool
      *
      * @param connection
      */
     public void releaseConnection(IPhynixxManagedConnection<C> connection) {
         if (connection == null || !connection.hasCoreConnection()) {
             return;
         }
         try {
             //StringBuilder builder= new StringBuilder(Thread.currentThread().getId()+".releaseConnection starting from "+this.genericObjectPool.getNumIdle()+"/"+this.genericObjectPool.getNumActive());
             this.genericObjectPool.returnObject(connection);
             // LOG.debug(builder.append(" ... to "+Thread.currentThread().getId()+"   "+this.genericObjectPool.getNumIdle()+"/"+this.genericObjectPool.getNumActive()).toString());
 
         } catch (Exception e) {
             throw new DelegatedRuntimeException(e);
         }
 
         if (LOG.isDebugEnabled()) {
             LOG.debug("Proxy " + connection + " returned to Pool");
         }
     }
 
     public void freeConnection(IPhynixxManagedConnection<C> connection) {
         if (connection == null) {
             return;
         }
         try {
             this.genericObjectPool.invalidateObject(connection);
         } catch (Exception e) {
             throw new DelegatedRuntimeException(e);
         }
     }
 
     public void close() {
         try {
             this.genericObjectPool.close();
             super.close();
         } catch (Exception e) {
             throw new DelegatedRuntimeException(e);
         }
 
     }
 
     public Class<C> getConnectionInterface() {
         return this.getConnectionFactory().getConnectionInterface();
     }
 
 
 
     /**
      * the connection is sent back to the pool
      */
     public void connectionReleased(IManagedConnectionEvent<C> event) {
         IPhynixxManagedConnection<C> proxy = event.getManagedConnection();
         if (!proxy.hasCoreConnection()) {
             return;
         } else {
             this.releaseConnection(proxy);
         }
         if (LOG.isDebugEnabled()) {
             LOG.debug("Proxy " + proxy + " released");
         }
 
     }
 
     /**
      * the connection is set free an released from the pool
      */
     public void connectionFreed(IManagedConnectionEvent<C> event) {
         IPhynixxManagedConnection<C> proxy = event.getManagedConnection();
         if (!proxy.hasCoreConnection()) {
             return;
         } else {
             this.freeConnection(proxy);
         }
         if (LOG.isDebugEnabled()) {
             LOG.debug("Proxy " + proxy + " released");
         }
 
     }
 
 
 
 }