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From cos...@apache.org
Subject cvs commit: jakarta-tomcat-connectors/jk/java/org/apache/jk/common Shm.java
Date Wed, 17 Apr 2002 22:36:04 GMT
costin      02/04/17 15:36:04

  Added:       jk/java/org/apache/jk/common Shm.java
  Log:
  A simple component that will automatically register the tomcat workers in
  the jk 'scoreboard'.
  
  Getting this to work is the last step in supporting multi-process JNI and
  dynamic addition/removal/status of workers for jk.
  
  So far attach() seems to work ( and I'm not sure if tomcat should create the
  shmem ).
  
  The data structures in the shm will be very similar with what jserv used to have,
  but more flexible.
  
  We may also need to add some mutexes - or at least atomic operations from
  APR.
  
  Revision  Changes    Path
  1.1                  jakarta-tomcat-connectors/jk/java/org/apache/jk/common/Shm.java
  
  Index: Shm.java
  ===================================================================
  /*
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999 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 acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Tomcat", 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 names without prior written
   *    permission of the Apache Group.
   *
   * 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/>.
   *
   * [Additional notices, if required by prior licensing conditions]
   *
   */
  
  package org.apache.jk.common;
  
  import java.io.*;
  
  import java.net.*;
  import java.util.*;
  
  import org.apache.tomcat.util.buf.*;
  import org.apache.tomcat.util.http.*;
  
  import org.apache.tomcat.util.threads.*;
  
  import org.apache.jk.core.*;
  import org.apache.jk.apr.*;
  
  
  /** Handle the shared memory objects.
   *
   * @author Costin Manolache
   */
  public class Shm extends JkHandler {
  
      String jkHome;
      String file;
  
      // Apr data. 
      private long memP;
      private long aprShmPoolP;
      private long aprShmP;
      private AprImpl apr;
      
      public Shm() {
      }
      
      public void setFile( String f ) {
          file=f;
      }
  
      /** 
       */
      public void setJkHome( String s ) {
          jkHome=s;
      }
  
      public void init() throws IOException {
          if( file==null ) {
              log.error("No shm file, disabling shared memory");
              return;
          }
          try {
              apr=(AprImpl)wEnv.getHandler("apr");
              if( apr==null ) {
                  log.error( "Apr unavailable, disabling shared memory " );
                  return;
              }
  
              aprShmPoolP=apr.poolCreate( 0 );
  
              aprShmP= apr.shmAttach( aprShmPoolP, file );
  
              if( aprShmP== 0 ) {
                  // no shared mem. This is normal result, but create should throw
                  log.info("Can't attach, try to create ");
              }
              
              //XXX not implemented.
          } catch( Throwable ex ) {
              log.error( "Can't initialize shared memory " + ex.toString() );
              apr=null;
          }
      }
  
      public void destroy() throws IOException {
          if( apr==null ) return;
          
          apr.shmDetach( aprShmPoolP, aprShmP );
      }
  
      public int invoke( Msg msg, MsgContext msgCtx ) {
          return OK;
      }
      
      private static org.apache.commons.logging.Log log=
          org.apache.commons.logging.LogFactory.getLog( Shm.class );
  
  }
  
  
  

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