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From mcconn...@apache.org
Subject cvs commit: avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial HelloComponent.java HelloComponent.xinfo RandomGenerator.java RandomGeneratorProvider.java RandomGeneratorProvider.xinfo RandomGeneratorProvider.xprofile RandomProfileSelector.java
Date Sat, 05 Apr 2003 11:53:42 GMT
mcconnell    2003/04/05 03:53:42

  Added:       merlin/merlin-smp/src/tutorial/008/src/config block.xml
               merlin/merlin-smp/src/tutorial/008/src/java/tutorial
                        HelloComponent.java HelloComponent.xinfo
                        RandomGenerator.java RandomGeneratorProvider.java
                        RandomGeneratorProvider.xinfo
                        RandomGeneratorProvider.xprofile
                        RandomProfileSelector.java
  Log:
  Pluggable Profile selection policy tutorial.
  
  Revision  Changes    Path
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/config/block.xml
  
  Index: block.xml
  ===================================================================
  
  <block name="tutorial">
     <container>
       <component name="hello" class="tutorial.HelloComponent" activation="startup"/>
    </container>
  </block>
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/HelloComponent.java
  
  Index: HelloComponent.java
  ===================================================================
  package tutorial;
  
  import org.apache.avalon.framework.logger.AbstractLogEnabled;
  import org.apache.avalon.framework.service.Serviceable;
  import org.apache.avalon.framework.service.ServiceManager;
  import org.apache.avalon.framework.service.ServiceException;
  
  public class HelloComponent extends AbstractLogEnabled 
    implements Serviceable
  {
  
     /**
      * Servicing of the component by the container during 
      * which service dependencies declared under the component
      * can be resolved using the supplied service manager.
      */
      public void service( ServiceManager manager )
        throws ServiceException
      {
          RandomGenerator random = (RandomGenerator) manager.lookup( "random" );
          getLogger().info( "random: " + random.getRandom() );
      }
  }
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/HelloComponent.xinfo
  
  Index: HelloComponent.xinfo
  ===================================================================
  <?xml version="1.0"?>
  <!DOCTYPE type
        PUBLIC "-//AVALON/Type DTD Version 1.0//EN"
               "http://avalon.apache.org/dtds/meta/type_1_1.dtd" >
  <type>
    <info>
      <name>hello</name>
      <version>1.0</version>
    </info>
    <dependencies>
      <dependency key="random" type="tutorial.RandomGenerator">
        <attributes>
          <attribute key="urn:avalon:profile.selector" value="tutorial.RandomProfileSelector"/>
        </attributes>
      </dependency>
    </dependencies>
  </type>
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/RandomGenerator.java
  
  Index: RandomGenerator.java
  ===================================================================
  
  package tutorial;
  
  /**
   * A service that provides access to a random number.
   */
  public interface RandomGenerator
  {
  
     /**
      * Return a random integer
      * @return the random number
      */
      int getRandom();
  
  }
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/RandomGeneratorProvider.java
  
  Index: RandomGeneratorProvider.java
  ===================================================================
  
  package tutorial;
  
  import java.util.Random;
  
  import org.apache.avalon.framework.configuration.Configuration;
  import org.apache.avalon.framework.configuration.ConfigurationException;
  import org.apache.avalon.framework.configuration.Configurable;
  import org.apache.avalon.framework.logger.AbstractLogEnabled;
  
  /**
   * An implementation of a random number generator.
   */
  public class RandomGeneratorProvider extends AbstractLogEnabled 
    implements Configurable, RandomGenerator
  {
  
      private Random m_random = null;
  
     /**
      * Configuration of the component by the container.  The 
      * implementation get a child element named 'source' and 
      * assigns the value of the element to a local variable.
      *
      * @param config the component configuration
      * @exception ConfigurationException if a configuration error occurs
      */
      public void configure( Configuration config ) throws ConfigurationException
      {
          getLogger().info( "configuration stage" );
          long seed = config.getChild( "seed" ).getValueAsLong( 0 );
          getLogger().info( "seed: " + seed );
          m_random = new Random( System.currentTimeMillis() * seed );
      }
  
     /**
      * Return a random integer
      * @return the random number
      */
      public int getRandom()
      {
          return m_random.nextInt();
      }
  }
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/RandomGeneratorProvider.xinfo
  
  Index: RandomGeneratorProvider.xinfo
  ===================================================================
  <?xml version="1.0"?>
  <!DOCTYPE type
        PUBLIC "-//AVALON/Type DTD Version 1.0//EN"
               "http://avalon.apache.org/dtds/meta/type_1_1.dtd" >
  <type>
    <info>
      <name>random-provider</name>
      <version>1.0</version>
    </info>
    <services>
      <service type="tutorial.RandomGenerator"/>
    </services>
  </type>
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/RandomGeneratorProvider.xprofile
  
  Index: RandomGeneratorProvider.xprofile
  ===================================================================
  <?xml version="1.0"?>
  
  <profiles>
  
    <profile name="primary">
      <configuration>
        <seed>1024</seed>
      </configuration>
    </profile>
  
    <profile name="secondary">
      <configuration>
        <seed>2048</seed>
      </configuration>
    </profile>
  
  </profiles>
  
  
  
  1.1                  avalon-sandbox/merlin/merlin-smp/src/tutorial/008/src/java/tutorial/RandomProfileSelector.java
  
  Index: RandomProfileSelector.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 tutorial;
  
  import org.apache.avalon.assembly.engine.profile.ProfileSelector;
  import org.apache.avalon.framework.logger.AbstractLogEnabled;
  import org.apache.avalon.meta.info.StageDescriptor;
  import org.apache.avalon.meta.info.DependencyDescriptor;
  import org.apache.avalon.meta.model.Profile;
  import org.apache.avalon.meta.model.Mode;
  
  /**
   * Select one profile from the multiple profile provided.
   *
   * @author <a href="mailto:mcconnell@apache.org">Stephen McConnell</a>
   * @version $Revision: 1.1 $ $Date: 2003/04/05 11:53:42 $
   */
  public class RandomProfileSelector extends AbstractLogEnabled
      implements ProfileSelector
  {
  
      /**
       * Returns the preferred profile form an available selection of 
       * candidate profiles.
       * @param profiles the set of candidate profiles
       * @param dependency the service dependency
       * @return the preferred profile or null if no satisfactory provider can be established
       */
      public Profile select( Profile[] profiles, DependencyDescriptor dependency )
      {
          if( profiles.length == 0 )
          {
              return null;
          }
  
          for( int i=0; i<profiles.length; i++ )
          {
              Profile profile = profiles[i];
              getLogger().info( "available profile: " + profile.getName() );
          }
  
          //
          // select the profile witgh the highest seed value
          //
  
          long seed = 0;
          Profile selection = profiles[0];
          for( int i=0; i<profiles.length; i++ )
          {
              Profile profile = profiles[i];
              long value = profile.getConfiguration().getChild( "seed" ).getValueAsLong( 0
);
              if( value > seed )
              {
                  seed = value;
                  selection = profile;
              }
          }
          return selection;
      }
  
      /**
       * Returns the preferred profile form an available selection of 
       * candidate profiles.
       * @param profiles the set of candidate profiles
       * @param stage the service stage depedency
       * @return the prefered profile or null if no satisfactory provider can be established
       */
      public Profile select( Profile[] profiles, StageDescriptor stage )
      {
          return null;
      }
  }
  
  
  

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