Source Code Cross Referenced for StateModelAdapter.java in  » Science » Cougaar12_4 » org » cougaar » planning » plugin » legacy » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.planning.plugin.legacy 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * <copyright>
003:         *  
004:         *  Copyright 1997-2004 BBNT Solutions, LLC
005:         *  under sponsorship of the Defense Advanced Research Projects
006:         *  Agency (DARPA).
007:         * 
008:         *  You can redistribute this software and/or modify it under the
009:         *  terms of the Cougaar Open Source License as published on the
010:         *  Cougaar Open Source Website (www.cougaar.org).
011:         * 
012:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
013:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
014:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
015:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
016:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
018:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
019:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
020:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
021:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
022:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
023:         *  
024:         * </copyright>
025:         */
026:
027:        package org.cougaar.planning.plugin.legacy;
028:
029:        import org.cougaar.core.component.Component;
030:        import org.cougaar.util.StateModelException;
031:
032:        /**
033:         * implement the standard state model
034:         *
035:         **/
036:        public abstract class StateModelAdapter implements  PluginStateModel,
037:                Component {
038:
039:            /** current reflection of Plugin run state **/
040:            private int runState = UNINITIALIZED;
041:
042:            /** Plugin State model accessor.
043:             **/
044:            public final int getModelState() {
045:                return runState;
046:            }
047:
048:            /** simple initialize method. 
049:             * Transits the state to UNLOADED.
050:             *  @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
051:             **/
052:            public synchronized void initialize() throws StateModelException {
053:                transitState("initialize()", UNINITIALIZED, UNLOADED);
054:            }
055:
056:            /** Notice which Agent we are.
057:             * also transit to LOADED.
058:             *  @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
059:             **/
060:            public synchronized void load(Object obj)
061:                    throws StateModelException {
062:                transitState("load()", UNLOADED, LOADED);
063:            }
064:
065:            /** This version of start just transits to ACTIVE.
066:             * Daemon subclasses may want to start threads here.
067:             *  @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
068:             **/
069:            public synchronized void start() throws StateModelException {
070:                transitState("start()", LOADED, ACTIVE);
071:            }
072:
073:            /** 
074:             *Just change the state to IDLE.
075:             **  @exception org.cougaar.util.StateModelException Cannot transition to new state.  
076:             **/
077:            public synchronized void suspend() throws StateModelException {
078:                transitState("suspend()", ACTIVE, IDLE);
079:            }
080:
081:            /**
082:             *		Transit from IDLE to ACTIVE .
083:             *  @exception org.cougaar.util.StateModelException If Cannot transition to new state.   
084:             **/
085:            public synchronized void resume() throws StateModelException {
086:                transitState("resume()", IDLE, ACTIVE);
087:            }
088:
089:            /** 
090:             *	  Transit from IDLE to LOADED. 
091:             *	  @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
092:             **/
093:            public synchronized void stop() throws StateModelException {
094:                transitState("stop()", IDLE, LOADED);
095:            }
096:
097:            /** Transit from ACTIVE to LOADED. 
098:             *   @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
099:             **/
100:            public synchronized void halt() throws StateModelException {
101:                transitState("halt()", ACTIVE, LOADED);
102:            }
103:
104:            /** Transit from LOADED to UNLOADED.
105:             *   @exception org.cougaar.util.StateModelException If Cannot transition to new state.  
106:             **/
107:            public synchronized void unload() throws StateModelException {
108:                transitState("unload()", LOADED, UNLOADED);
109:            }
110:
111:            /** Accomplish the state transition.
112:             *   Be careful and complain if we are in an inappropriate starting state.
113:             *   @exception org.cougaar.util.StateModelException If Cannot transition to new state.   
114:             **/
115:            private synchronized void transitState(String op,
116:                    int expectedState, int endState) throws StateModelException {
117:                if (runState != expectedState) {
118:                    throw new StateModelException("" + this  + "." + op
119:                            + " called in inappropriate state (" + runState
120:                            + ")");
121:                } else {
122:                    runState = endState;
123:                }
124:            }
125:
126:        }
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