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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package freemarker.debug;

import java.rmi.Remote;
import java.rmi.RemoteException;
import java.util.Collection;
import java.util.List;

/**
 * The main debugger interface. Allows management of breakpoints as well as
 * installation of listeners for debug events.
 */
public interface Debugger extends Remote {
    public static final int DEFAULT_PORT = 7011;

    /**
     * Adds a breakpoint
     * @param breakpoint the breakpoint to add
     */
    public void addBreakpoint(Breakpoint breakpoint)
    throws RemoteException;
    
    /**
     * Removes a single breakpoint
     * @param breakpoint the breakpoint to remove
     */
    public void removeBreakpoint(Breakpoint breakpoint)
    throws RemoteException;

    /**
     * Removes all breakpoints for a specific template
     */
    public void removeBreakpoints(String templateName)
    throws RemoteException;

    /**
     * Removes all breakpoints
     */
    public void removeBreakpoints()
    throws RemoteException;

    /**
     * Retrieves a list of all {@link Breakpoint} objects.
     */
    public List getBreakpoints()
    throws RemoteException;
        
    /**
     * Retrieves a list of all {@link Breakpoint} objects for the specified
     * template.
     */
    public List getBreakpoints(String templateName)
    throws RemoteException;

    /**
     * Retrieves a collection of all {@link DebuggedEnvironment} objects that 
     * are currently suspended.
     */
    public Collection getSuspendedEnvironments()
    throws RemoteException;
        
    /**
     * Adds a listener for debugger events.
     * @return an identification token that should be passed to 
     * {@link #removeDebuggerListener(Object)} to remove this listener.
     */
    public Object addDebuggerListener(DebuggerListener listener)
    throws RemoteException;
        
    /**
     * Removes a previously added debugger listener.
     * @param id the identification token for the listener that was returned
     * from a prior call to {@link #addDebuggerListener(DebuggerListener)}.
     */
    public void removeDebuggerListener(Object id)
    throws RemoteException;
}