serverimpl.java

一个类似于openJMS分布在ObjectWeb之下的JMS消息中间件。

      Trace.logger.log(BasicLevel.DEBUG, "ServerImpl.unbind(" + 
                       path + ')');

    // The root context cannot be deleted.
    if (path.size() == 0) throw new NamingException("Cannot unbind the root context");

    path = (CompositeName)path.clone();    
    String lastName = (String)path.remove(path.size() - 1);
    NamingContext nc = contextManager.getNamingContext(path);    

    if (unbind(nc, lastName, serverId)) {
      if (updateListener != null) {
        updateListener.onUpdate(
          new UnbindEvent(nc.getId(), lastName));
      }
    }
  }

  public boolean unbind(NamingContext nc,
                        String lastName,
                        Object ownerId) throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, 
                       "ServerImpl.unbind(" + 
                       nc + ',' +
                       lastName + ',' + 
                       ownerId + ')');
    if (! nc.getOwnerId().equals(ownerId)) {
      throw new NotOwnerException(
        nc.getOwnerId());
    }
    Record r = nc.getRecord(lastName);
    if (r != null) { 
      if (r instanceof ContextRecord) {
        throw new NamingException("Cannot unbind a context");
      } else {
        nc.removeRecord(lastName);
        contextManager.storeNamingContext(nc);        
        return true;
      }
    } else {
      // else do nothing (idempotency)
      return false;
    }
  }

  public NameClassPair[] list(CompositeName path) throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, "ServerImpl.list(" + path + ')');
    NamingContext nc = contextManager.getNamingContext(path);
    return nc.getNameClassPairs();
  }

  public Binding[] listBindings(CompositeName path) throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, "ServerImpl.listBindings(" + path + ')');
    NamingContext nc = contextManager.getNamingContext(path);
    return nc.getBindings();
  }

  public void createSubcontext(CompositeName path) 
    throws NamingException {
    createSubcontext(path, serverId);
  }

  /**
   * Create a subcontext.
   *
   * @param path the path of the subcontext
   *
   * @param subcontextOwner identifier of the owner of
   * the subcontext (<code>null</code> if the 
   * owner is the local naming server).
   *
   * @exception NameAlreadyBoundException if the name of
   * the subcontext is already bound.
   * 
   * @exception NameNotFoundException if some of the
   * intermediate names in the path don't exist.
   * 
   * @exception NotOwnerException if the owner of the 
   * parent context is checked and is not the local
   * naming server.
   */
  public void createSubcontext(CompositeName path,
                               Object subcontextOwnerId) 
    throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(
        BasicLevel.DEBUG, 
        "ServerImpl.createSubcontext(" + 
        path + ',' + subcontextOwnerId + ')');

    // The root already exists.
    if (path.size() == 0) throw new NameAlreadyBoundException();

    CompositeName parentPath = (CompositeName)path.clone();    
    String lastName = 
      (String)parentPath.remove(parentPath.size() - 1);
    NamingContext parentNc = 
      contextManager.getNamingContext(parentPath);

    NamingContextId ncid = createSubcontext(
      parentNc, lastName, path, null,
      subcontextOwnerId, serverId);

    if (updateListener != null) {
      updateListener.onUpdate(
        new CreateSubcontextEvent(
          parentNc.getId(), lastName, path, ncid, 
          subcontextOwnerId));
    }
  }
    
  public NamingContextId createSubcontext(
    NamingContext parentNc, 
    String lastName,
    CompositeName path,
    NamingContextId ncid,
    Object subcontextOwnerId,
    Object ownerId) 
    throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, 
                       "ServerImpl.createSubcontext(" + 
                       parentNc + ',' +
                       lastName + ',' + 
                       path + ',' + 
                       ncid + ',' + 
                       subcontextOwnerId + ',' +
                       ownerId + ')');
    if (! parentNc.getOwnerId().equals(ownerId)) {
      throw new NotOwnerException(
        parentNc.getOwnerId());
    }

    if (parentNc.getRecord(lastName) != null) 
      throw new NameAlreadyBoundException();
    
    NamingContext nc = 
      contextManager.newNamingContext(
        subcontextOwnerId, ncid, path);
    parentNc.addRecord(new ContextRecord(
      lastName, nc.getId()));
    contextManager.storeNamingContext(parentNc);
    return nc.getId();
  }

  /**
   * Destroy a subcontext. This operation is
   * idempotent: does nothing if the final name of
   * the path is not found.
   *
   * @param path the path of the subcontext
   *
   * @exception NameAlreadyBoundException if the name of
   * the subcontext is already bound.
   * 
   * @exception NameNotFoundException if some of the
   * intermediate names in the path don't exist.
   * 
   * @exception NotOwnerException if the owner of the 
   * parent context is checked and is not the local
   * naming server.
   * 
   * @exception NotContextException if the specified path
   * isn't bound to a context.
   */
  public void destroySubcontext(CompositeName path) throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, 
                       "ServerImpl.destroySubcontext(" + 
                       path + ')');

    if (path.size() == 0) 
      throw new NamingException("Cannot delete root context.");

    CompositeName parentPath = (CompositeName)path.clone();
    String lastName = (String)parentPath.remove(parentPath.size() - 1);
    NamingContext parentNc = contextManager.getNamingContext(parentPath);
    
    try {
      NamingContext nc = contextManager.getNamingContext(path);
      if (nc.size() > 0) {
        if (Trace.logger.isLoggable(BasicLevel.DEBUG))
          Trace.logger.log(BasicLevel.DEBUG, 
                           " -> not empty: nc = " + nc);
        throw new ContextNotEmptyException();
      }
    } catch (MissingRecordException exc) {
      // else do nothing (idempotency)
      return;
    }

    if (destroySubcontext(parentNc, lastName, path, serverId)) {
      if (updateListener != null) {
        updateListener.onUpdate(
          new DestroySubcontextEvent(
            parentNc.getId(), lastName, path));
      }
    }
  }

  public boolean destroySubcontext(NamingContext parentNc,                                    
                                   String lastName,
                                   CompositeName path,
                                   Object ownerId) 
    throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, 
                       "ServerImpl.destroySubcontext(" + 
                       parentNc + ',' +
                       lastName + ',' + 
                       path + ',' +
                       ownerId + ')');
    if (! parentNc.getOwnerId().equals(ownerId)) {
      throw new NotOwnerException(
        parentNc.getOwnerId());
    }

    Record r = parentNc.getRecord(lastName);
    if (r != null) {
      if (r instanceof ContextRecord) {        
        ContextRecord cr = (ContextRecord)r;
        NamingContextId ctxId = cr.getId();
        contextManager.delete(ctxId, path);
        
        // Remove from the parent context
        parentNc.removeRecord(lastName);
        contextManager.storeNamingContext(parentNc);        
        return true;
      } else {
        throw new NotContextException();
      }
    } else {
      // else do nothing (idempotency)
      return false;
    }
  }

  /**
   * Returns copies of the naming contexts owned by the server
   * which identifier is specified.
   *
   * @param serverId the identifier of the server that owns
   * the naming contexts to get.
   */
  public NamingContextInfo[] copyNamingContexts(Object serverId) 
    throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
    Trace.logger.log(BasicLevel.DEBUG, 
                     "ServerImpl.copyNamingContexts(" + serverId + ')');
    return contextManager.copyNamingContexts(serverId);
  }

  public NamingContext getNamingContext(NamingContextId ncid)
    throws NamingException {
    return contextManager.getNamingContext(ncid);
  }

  public void addNamingContext(NamingContextInfo ncInfo)
    throws NamingException {
    if (Trace.logger.isLoggable(BasicLevel.DEBUG))
      Trace.logger.log(BasicLevel.DEBUG, 
                       "ServerImpl.addNamingContext(" + 
                       ncInfo + ')');
    contextManager.addNamingContext(ncInfo);
  }

  public void changeOwner(Object formerOwnerId)
    throws NamingException {
    NamingContextInfo[] contexts = 
      contextManager.changeOwner(
        formerOwnerId, serverId);    
    if (updateListener != null) {
      updateListener.onUpdate(
        new ChangeOwnerEvent(
          formerOwnerId,
          contexts));
    }
  }

  public void resetNamingContext(NamingContext context)
    throws NamingException {
    contextManager.resetNamingContext(context);
  }

  public void writeBag(ObjectOutputStream out)
    throws IOException {
    contextManager.writeBag(out);
  }

  public void readBag(ObjectInputStream in) 
    throws IOException, ClassNotFoundException {
    contextManager.readBag(in);
  }
}