httpjmsconnectionstub.java

实现了Jms的服务器源码,支持多种适配器,DB,FTP,支持多种数据库

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 *    copy of this document.
 *
 * 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.
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 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Exoffice Technologies.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Exoffice Technologies. Exolab is a registered
 *    trademark of Exoffice Technologies.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``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
 * EXOFFICE TECHNOLOGIES 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.
 *
 * Copyright 2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: HttpJmsConnectionStub.java,v 1.5 2003/08/25 03:33:19 tanderson Exp $
 *
 * Date             Author      Changes
 * 12 Oct 2001  	mourikis    Created
 */
package org.exolab.jms.client.http;

import java.util.Enumeration;
import java.util.Vector;

import javax.jms.JMSException;

import org.exolab.core.ipc.IpcIfc;
import org.exolab.jms.client.JmsConnectionStubIfc;
import org.exolab.jms.client.JmsSessionStubIfc;


/**
 * Used to create OpenJmsSessions to the server. It gets the new Session Id
 * assigned by the server and returns a HttpJmsSessionStub.
 *
 * @version     $Revision: 1.5 $ $Date: 2003/08/25 03:33:19 $
 * @author      <a href="mailto:[e-mail]">Jim Mourikis</a>
 * @see 	org.exolab.core.http.HttpClient
 */
public class HttpJmsConnectionStub implements JmsConnectionStubIfc {

    /**
     * This is a reference to the Client connection.
     */
    private IpcIfc _connection = null;

    // The client connection id.
    private String _clientId;

    // The destination connection id
    private String _connectionId;

    // The list of sessions for this connection.
    Vector _sessions = new Vector();


    /**
     * Construct an instance of this class with the specified id's.
     * These id's are used when creating sessions.
     *
     * @param      	connection  The http connection to the server.
     * @param		clientId This clients unique id.
     * @param		connectionId This objects connection identifier.
     * @throws   JMSException If the connection has failed.
     *
     */
    public HttpJmsConnectionStub(IpcIfc connection, String clientId,
                                 String connectionId)
        throws JMSException {
        if (connection != null) {
            _connection = connection;
            _clientId = clientId;
            _connectionId = connectionId;
        } else {
            throw new JMSException("Cannot instantiate with a null " +
                "connection");
        }
    }

    /**
     * Send a session connection message. Create a new HttpJmsSessionStub
     * if this createSession request was successfull.
     *
     * @param ackMode - the ack mode for the session
     * @param transacted - true if the session is transacted
     * @return JmsSessionStubIfc The Session interface.
     * @throws JMSException On failure to create a session.
     */
    public JmsSessionStubIfc createSession(int ackMode, boolean transacted)
        throws JMSException {
        JmsSessionStubIfc stub = null;

        try {
            Vector v = pack("createSession", 2);
            synchronized (_connection) {
                v.add(new Integer(ackMode));
                v.add(new Boolean(transacted));
                _connection.send(v);
                v = checkReply("createSession");
            }

            Vector state = (Vector) v.get(1);
            String sessionId = (String) state.get(0);
            stub = new HttpJmsSessionStub(_connection, _clientId,
                                          _connectionId, sessionId);
            _sessions.add(stub);
        } catch (JMSException exception) {
            throw exception;
        } catch (Exception exception) {
            // rethrow as a JMSException
            throw new JMSException("Failed to create session: " + exception);
        }

        return stub;
    }

    /**
     * Send a close request to the server.
     *
     * @throws JMSException On failure to close connection.
     */
    public void close() throws JMSException {
        try {
            Vector v = pack("close", 0);
            synchronized (_connection) {
                _connection.send(v);
                v = checkReply("close");
            }
        } catch (JMSException exception) {
            throw exception;
        } catch (Exception exception) {
            // rethrow as a JMSException
            throw new JMSException("Failed to close: " + exception);
        } finally {
            _connection = null;
            for (Enumeration e = _sessions.elements();
                 e.hasMoreElements();) {
                ((HttpJmsSessionStub) e.nextElement()).stopReceiver();
            }
        }
    }

    /**
     * Return the client connection id.
     *
     * @return the client connection id.
     */
    public String getConnectionId() {
        return _connectionId;
    }

    // implementation of JmsConnectionStubIfc.destroy
    public void destroy() {
        _connection = null;
    }

    /**
     * Pack all the data that is required by the server in a vector.
     * Set the size of the vector to be exactly the right size for efficiency.
     *
     * @param method The function to activate on the server.
     * @param numParams The number of paramaters this method will require.
     * @return Vector The vector containing all the data.
     */
    private Vector pack(String method, int numParams) {
        Vector v = new Vector(4 + numParams);
        v.add("org.exolab.jms.server.mipc.IpcJmsServerConnection");
        v.add(method);
        v.add(_clientId);
        v.add(_connectionId);
        return v;
    }

    /**
     * A convenience method to check the success of operations
     *
     * @param method the requested server function.
     * @throws JMSException On any failure.
     * @return the result of the request
     */
    private Vector checkReply(String method) throws JMSException {
        Vector v = null;
        try {
            v = (Vector) _connection.receive();
        } catch (Exception exception) {
            // rethrow as a JMSException
            throw new JMSException("Operation " + method + " failed: "
                                   + exception);
        }

        if (v != null) {
            Boolean b = (Boolean) v.get(0);
            if (!b.booleanValue()) {
                if (v.get(1) instanceof JMSException) {
                    throw (JMSException) v.get(1);
                } else {
                    throw new JMSException("Operation " + method +
                        " failed: " + v.get(1));
                }
            }
        } else {
            throw new JMSException("Unknown connection error for " + method);
        }

        return v;
    }

} //-- HttpConnectionStub