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From mcconn...@apache.org
Subject cvs commit: avalon-sandbox/assembly/src/java/org/apache/avalon/assembly/lifecycle/composition StandardServiceManager.java DefaultServiceManager.java
Date Tue, 17 Dec 2002 05:00:08 GMT
mcconnell    2002/12/16 21:00:08

  Added:       assembly/src/java/org/apache/avalon/assembly/lifecycle/composition
                        StandardServiceManager.java
  Removed:     assembly/src/java/org/apache/avalon/assembly/lifecycle/composition
                        DefaultServiceManager.java
  Log:
  DefaultServiceManager renamed to StandardServiceManager.
  
  Revision  Changes    Path
  1.1                  avalon-sandbox/assembly/src/java/org/apache/avalon/assembly/lifecycle/composition/StandardServiceManager.java
  
  Index: StandardServiceManager.java
  ===================================================================
  /* ==================================================================== 
   * The Apache Software License, Version 1.1 
   * 
   * Copyright (c) 2002 The Apache Software Foundation. All rights 
   * reserved. 
   * 
   * Redistribution and use in source and binary forms, with or without 
   * modification, are permitted provided that the following conditions 
   * are met: 
   * 
   * 1. Redistributions of source code must retain the above copyright 
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *    "This product includes software developed by the
   *    Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software 
   *    itself, if and wherever such third-party acknowledgments  
   *    normally appear.
   *
   * 4. The names "Jakarta", "Avalon", and "Apache Software Foundation" 
   *    must not be used to endorse or promote products derived from this
   *    software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation. For more
   * information on the Apache Software Foundation, please see 
   * <http://www.apache.org/>.
   */ 
  package org.apache.avalon.assembly.lifecycle.composition;
  
  import java.util.Hashtable;
  
  import org.apache.avalon.framework.logger.AbstractLogEnabled;
  import org.apache.avalon.framework.service.ServiceException;
  import org.apache.avalon.framework.service.ServiceManager;
  import org.apache.avalon.assembly.appliance.Appliance;
  import org.apache.avalon.meta.info.DependencyDescriptor;
  
  /**
   * Helper class the implements the <code>ServiceManager</code> interface and
   * is supplied to componets during lifecyle processing.
   * @author Stephen McConnell <mcconnell@osm.net>
   */
  public class StandardServiceManager extends AbstractLogEnabled implements ServiceManager
  {
  
      //========================================================================
      // state
      //========================================================================
  
      /**
       * A map of resources keyed by lookup role.
       */
      private Appliance m_appliance;
  
      /**
       * A table of appliance instances keyed by the object that was provided
       * by the appliance so that we can locate the correct appliance when 
       * releasing the object.
       */
      private Hashtable m_table = new Hashtable();
  
      //========================================================================
      // constructor
      //========================================================================
  
      /**
       * Construct a new ServiceManager.
       * @param profile the component profile
       */
      public StandardServiceManager( Appliance appliance )
      {
          m_appliance = appliance;
      }
  
      //========================================================================
      // ServiceManager
      //========================================================================
  
      /**
       * Returns true if a provider exists for the supplied role.
       * @param role the service identifier
       * @return boolean TRUE if the service is available else FALSE
       */
      public boolean hasService( String role )
      {
          return ( m_appliance.getServiceProvider( role ) != null );
      }
  
      /**
       * Retrieve Object by role from ComponentLocator.
       * @param role the role
       * @return the Object
       * @throws ServiceException if an error occurs
       */
      public Object lookup( String role ) throws ServiceException
      {
          if( role == null )
          {
              throw new NullPointerException( "role" );
          }
  
          DependencyDescriptor dependency = 
            m_appliance.getProfile().getType().getDependency( role );
          Appliance provider = m_appliance.getServiceProvider( role );
          if( provider == null )
          {
              final String error =
                "Internal error - incorrect assembly in appliance: " + m_appliance
                + ". A null provider was retured for the dependency: " + dependency;
              throw new ServiceException( role, error );
          }
  
          try
          {
              Object object = provider.access( dependency );
              m_table.put( object, provider );
              return object;
          }
          catch( Throwable e )
          {
              final String error = 
                "Unexpected internal error while accessing a service provider in appliance:
"
                + m_appliance
                + " for the role: " + role;
              throw new ServiceException( role, error, e );
          }
      }
  
      /**
       * Release a pooled object.
       * @param object a pooled object
       */
      public void release( Object object )
      {
          Appliance provider = (Appliance) m_table.get( object );
          if( provider == null )
          {
              if( getLogger().isWarnEnabled() )
              {
                  final String warning =
                    "Inconsistent release request - the object: "
                    + object.getClass().getName() 
                    + "/" + System.identityHashCode( object )
                    + " was not provided by this manager.";
                  getLogger().warn( warning );
              }
          }
          else
          {
              provider.release( object );
              m_table.remove( object );
          }
      }
  }
  
  

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