Source Code Cross Referenced for Accumulator.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » spi » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.spi 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005 JBoss Inc
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         * 
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.drools.spi;
018:
019:        import org.drools.WorkingMemory;
020:        import org.drools.common.InternalFactHandle;
021:        import org.drools.rule.Declaration;
022:
023:        /**
024:         * Accumulator
025:         *
026:         * Created: 04/06/2006
027:         * @author <a href="mailto:tirelli@post.com">Edson Tirelli</a> 
028:         *
029:         * @version $Id: Accumulator.java 13464 2007-07-13 22:15:50Z tirelli $
030:         */
031:        public interface Accumulator extends Invoker {
032:
033:            /**
034:             * Creates and return a context object for each working memory instance
035:             * 
036:             * @return
037:             */
038:            public Object createWorkingMemoryContext();
039:
040:            /**
041:             * Creates the context object for an accumulator session.
042:             * The context is passed as a parameter to every subsequent accumulator
043:             * method call in the same session.
044:             * 
045:             * @return
046:             */
047:            public Object createContext();
048:
049:            /**
050:             * Executes the initialization block of code
051:             * 
052:             * @param leftTuple tuple causing the rule fire
053:             * @param declarations previous declarations
054:             * @param workingMemory
055:             * @throws Exception
056:             */
057:            public void init(Object workingMemoryContext, Object context,
058:                    Tuple leftTuple, Declaration[] declarations,
059:                    WorkingMemory workingMemory) throws Exception;
060:
061:            /**
062:             * Executes the accumulate (action) code for the given fact handle
063:             * 
064:             * @param leftTuple
065:             * @param handle
066:             * @param declarations
067:             * @param innerDeclarations
068:             * @param workingMemory
069:             * @throws Exception
070:             */
071:            public void accumulate(Object workingMemoryContext, Object context,
072:                    Tuple leftTuple, InternalFactHandle handle,
073:                    Declaration[] declarations,
074:                    Declaration[] innerDeclarations, WorkingMemory workingMemory)
075:                    throws Exception;
076:
077:            /**
078:             * Returns true if this accumulator supports operation reversal
079:             * 
080:             * @return
081:             */
082:            public boolean supportsReverse();
083:
084:            /**
085:             * Reverses the accumulate action for the given fact handle
086:             * 
087:             * @param context
088:             * @param leftTuple
089:             * @param handle
090:             * @param declarations
091:             * @param innerDeclarations
092:             * @param workingMemory
093:             * @throws Exception
094:             */
095:            public void reverse(Object workingMemoryContext, Object context,
096:                    Tuple leftTuple, InternalFactHandle handle,
097:                    Declaration[] declarations,
098:                    Declaration[] innerDeclarations, WorkingMemory workingMemory)
099:                    throws Exception;
100:
101:            /**
102:             * Gets the result of the accummulation
103:             * 
104:             * @param leftTuple
105:             * @param declarations
106:             * @param workingMemory
107:             * @return
108:             * @throws Exception
109:             */
110:            public Object getResult(Object workingMemoryContext,
111:                    Object context, Tuple leftTuple,
112:                    Declaration[] declarations, WorkingMemory workingMemory)
113:                    throws Exception;
114:
115:        }
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