openjmscontext.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

/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    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.
 *
 * 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 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: OpenJMSContext.java,v 1.6 2003/08/17 01:32:23 tanderson Exp $
 *
 * Date         Author  Changes
 * $Date	    jimm    Created
 */
package org.exolab.jms.jndiadministration;

import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;

import javax.naming.Context;
import javax.naming.NameClassPair;
import javax.naming.NamingException;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;


/**
 * This class controls all dispay characteristics and menus related to a
 * queue/topic object. Currently only add/delete, edit and purge is supported.
 * Add is added from the OpenJMSServer node. Only one menu is created for
 * all queue/topics since it is modal, it can be shared by all the nodes.
 *
 * @version     $Revision: 1.6 $ $Date: 2003/08/17 01:32:23 $
 * @author      <a href="mailto:[e-mail]">Jim Mourikis</a>
 * @see         AdminMgr
 */
public class OpenJMSContext extends DefaultMutableTreeNode
    implements OpenJMSNode {

    // The Context Name
    private String contextName_;

    // The display name
    private String displayName_;

    // Does this context have any nodes
    private boolean isLeaf_;

    // Whether this node has been opened and explored already.
    private boolean isExplored_ = false;

    //  A reference to the tree this node belongs to.
    static private JTree tree_ = null;

    // A flag indicating if the menu has been created yet.
    static private boolean commandsCreated_ = false;

    // The popup menu for all contexts
    static private JPopupMenu commands_ = null;


    /**
     * The constructor gets its unique name for this context and a
     * reference to its parent tree.
     *
     * <P>If this is the first context call, the menu for all contexts
     * is created.
     *
     * @param contextName This context name.
     * @param tree The parent tree this context belongs to.
     *
     */
    public OpenJMSContext(String contextName, String parentName, JTree tree) {
        if (parentName != null) {
            contextName_ = parentName + "." + contextName;
        } else {
            contextName_ = contextName;
        }
        displayName_ = contextName;

        isLeaf_ = false;
        if (!commandsCreated_) {
            tree_ = tree;
            createCommands();
            commandsCreated_ = true;
        }
    }

    /**
     * Create the menu for all contexts and set up the Action events for
     * each menu item. Since menus are shared, the callbacks called are
     * static. Once a menu is slected, the slected node can be determined
     * from the parent object.
     *
     */
    protected void createCommands() {
        commands_ = new JPopupMenu();
        JMenuItem m = new JMenuItem("Add Context");
        m.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                createContext();
            }
        });
        commands_.add(m);

        m = new JMenuItem("Bind Object");
        m.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                bindObject();
            }
        });
        commands_.add(m);

        m = new JMenuItem("Rename Context");
        m.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                renameContext();
            }
        });
        commands_.add(m);

        m = new JMenuItem("Delete Context");
        m.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                deleteContext();
            }
        });
        commands_.add(m);
    }

    /**
     * Children are allowed for all contexts
     *
     * @return boolean Always returns true.
     *
     */
    public boolean getAllowsChildren() {
        return true;
    }

    /**
     * Contexts are leaves iff they have no objects registered against
     * them.
     *
     * @return boolean true if no objects are registered.
     */
    public boolean isLeaf() {
        return isLeaf_;
    }

    /**
     * As a performance enhancement, no child is added to the context until
     * after it is expanded.
     */
    public void update() {
        if (!isExplored_) {
            Object ob = AdminConnection.instance().lookup(contextName_);
            if (ob != null) {
                if (ob instanceof Context) {
                    Enumeration e = AdminConnection.instance().getAllContexts
                        (contextName_);
                    if (e != null) {
                        while (e.hasMoreElements()) {
                            NameClassPair pair =
                                (NameClassPair) e.nextElement();
                            add(new OpenJMSContext
                                (pair.getName(), contextName_, tree_));
                        }
                    }
                } else {
                    add(new OpenJMSObject(ob.getClass().getName(), tree_));
                }
                refresh();
            }
            isExplored_ = true;
        }
    }

    /**
     * This node has been right clicked. The locations of this node is given
     * by the loc object. Use this location to popup the context
     * menu.
     *
     * @param The location of this node.
     *
     */
    public void displayCommands(Rectangle loc) {
        double x;
        double y;

        x = loc.getX();
        y = loc.getY();
        y += loc.getHeight();

        commands_.show(tree_, (int) x, (int) y);
    }

    /**
     * The unique name of this Context
     *
     * @return String the context name
     */
    public String toString() {
        return displayName_;
    }

    /**
     * This node has changed. Inform the parent tree that it needs to be
     * re-drawn.
     */
    private void refresh() {
        DefaultTreeModel model = (DefaultTreeModel) tree_.getModel();
        model.nodeStructureChanged((DefaultMutableTreeNode) this);
    }

    /**
     * Get the particular instance of the context that has been selected.
     *
     * @return OpenJMSContext the instance selected.
     */
    static private OpenJMSContext getInstanceSelected() {
        Object loc = tree_.getLastSelectedPathComponent();
        return (OpenJMSContext) loc;
    }

    /**
     * Create a new context. Popup the dialog, and prompt the user for the
     * context name. Attempt to create the context. If creation is successfull
     * add the node to the tree.
     */
    static private void createContext() {
        OpenJMSContext This = getInstanceSelected();
        ObjectDialog.instance().display("Enter a unique context name",
            "Context Creation");
        if (ObjectDialog.instance().isConfirmed()) {
            try {
                AdminConnection.instance().createContext
                    (This.contextName_ + "." +
                    ObjectDialog.instance().getName());
                This.add(new OpenJMSContext
                    (ObjectDialog.instance().getName(), This.contextName_,
                        tree_));
                This.refresh();
            } catch (NamingException exception) {
                JOptionPane.showMessageDialog(
                    tree_, exception.getMessage(), "Context Create Error",
                    JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    /**
     * Rename the selected context.
     */
    static private void renameContext() {
        OpenJMSContext This = getInstanceSelected();
        ObjectDialog.instance().display(
            "Enter a new context name\n" +
            "for context: " + This.displayName_, "Rename Context");
        if (ObjectDialog.instance().isConfirmed()) {
            try {
                String newName = This.contextName_.substring
                    (0, This.contextName_.indexOf(This.displayName_));
                newName += ObjectDialog.instance().getName();
                AdminConnection.instance().renameContext(
                    This.contextName_, newName);
                This.contextName_ = newName;
                This.displayName_ = ObjectDialog.instance().getName();
                This.refresh();
            } catch (NamingException exception) {
                JOptionPane.showMessageDialog(
                    tree_, exception.getMessage(),
                    "Context Rename Error", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    /**
     * Create a new Object. The object must be given its fully qualified name
     * and have a default constructor.
     * For this release no paramaters are passed in.
     */
    static private void bindObject() {
        String errorString = null;

        OpenJMSContext This = getInstanceSelected();
        ObjectDialog.instance().display(
            "Enter the objects fully qualified name", "Bind Object");
        if (ObjectDialog.instance().isConfirmed()) {
            try {
                Object ob = null;

                if (ObjectDialog.instance().getName().equals(
                    "org.exolab.jms.client.JmsTopic")) {
                    ob = new org.exolab.jms.client.JmsTopic(This.contextName_);
                } else if (ObjectDialog.instance().getName().equals(
                    "org.exolab.jms.client.JmsQueue")) {
                    ob = new org.exolab.jms.client.JmsQueue(This.contextName_);
                    ((org.exolab.jms.client.JmsDestination)
                        ob).setPersistent(true);
                } else {
                    ob = Class.forName(
                        ObjectDialog.instance().getName()).newInstance();
                }

                AdminConnection.instance().rebind(This.contextName_, ob);
                This.removeAllChildren();
                This.add(new OpenJMSObject(
                    ObjectDialog.instance().getName(), tree_));
                This.refresh();
            } catch (NamingException exception) {
                errorString = exception.getMessage();
            } catch (IllegalAccessException exception) {
                errorString = "Illegal Access error for\n" + "Object: " +
                    ObjectDialog.instance().getName();
            } catch (InstantiationException exception) {
                errorString = "Object: " + ObjectDialog.instance().getName() +
                    "\nCannot be instantaiated";
            } catch (ClassNotFoundException exception) {
                errorString = "Object: " + ObjectDialog.instance().getName() +
                    "\nCannot be found";
            }

            if (errorString != null) {
                JOptionPane.showMessageDialog(
                    tree_, errorString, "Object bind error",
                    JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    /**
     * Delete the selected context object. Display a confirmation dialog
     * and wait for its return. If the user has confirmed the action, first
     * delete it from the database and if that is successful remove the node
     * from the tree.
     *
     * <P>Note: deleting a context also deletes all subcontexts and bound
     * objects.
     */
    static private void deleteContext() {
        OpenJMSContext This = getInstanceSelected();
        QueryDialog.instance().display(
            "Are you sure you want to delete \nselected Context: "
            + This.displayName_);
        if (QueryDialog.instance().isConfirmed()) {
            try {
                AdminConnection.instance().destroyContext(This.contextName_);
                This.removeFromParent();
                This.refresh();
            } catch (NamingException exception) {
                JOptionPane.showMessageDialog(
                    tree_, exception.getMessage(), "Context Destroy Error",
                    JOptionPane.ERROR_MESSAGE);
            }
        }
    }

} //-- OpenJMSContext