Source Code Cross Referenced for DummyPersistence.java in  » Science » Cougaar12_4 » org » cougaar » core » persist » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.core.persist 
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.core.persist;
028:
029:        import java.io.IOException;
030:        import java.io.InputStream;
031:        import java.io.OutputStream;
032:
033:        import org.cougaar.core.service.DataProtectionKey;
034:
035:        /**
036:         * A {@link PersistencePlugin} that does nothing.
037:         * <p>
038:         * Persistence clients can check the {@link
039:         * Persistence#isDummyPersistence} method to avoid the (minimal)
040:         * overhead imposed by this implementation.
041:         * <p>
042:         * Running with this persistence implementation incurs most
043:         * of the work of doing persistence, but discards the results.
044:         * This is often used for performance testing.
045:         */
046:        public class DummyPersistence extends PersistencePluginAdapter
047:                implements  PersistencePlugin {
048:
049:            public void init(PersistencePluginSupport pps, String name,
050:                    String[] params, boolean deleteOldPersistence)
051:                    throws PersistenceException {
052:                init(pps, name, params);
053:            }
054:
055:            protected void handleParameter(String param) {
056:                // Ignore params
057:            }
058:
059:            public boolean isWritable() {
060:                return true; // Cannot be disabled.
061:            }
062:
063:            public SequenceNumbers[] readSequenceNumbers(String suffix) {
064:                return new SequenceNumbers[0];
065:            }
066:
067:            public void writeSequenceNumbers(SequenceNumbers sequenceNumbers) {
068:            }
069:
070:            public void cleanupOldDeltas(SequenceNumbers cleanupNumbers) {
071:            }
072:
073:            public void cleanupArchive() {
074:            }
075:
076:            public OutputStream openOutputStream(int deltaNumber, boolean full)
077:                    throws IOException {
078:                return null; // Null means don't write output
079:            }
080:
081:            public void finishOutputStream(SequenceNumbers retain, boolean full) {
082:            }
083:
084:            public void abortOutputStream(SequenceNumbers retain) {
085:            }
086:
087:            public InputStream openInputStream(int deltaNumber)
088:                    throws IOException {
089:                throw new IOException("No dummy input");
090:            }
091:
092:            public void finishInputStream(int deltaNumber) {
093:            }
094:
095:            public void deleteOldPersistence() {
096:            }
097:
098:            public void storeDataProtectionKey(int deltaNumber,
099:                    DataProtectionKey key) throws IOException {
100:            }
101:
102:            public DataProtectionKey retrieveDataProtectionKey(int deltaNumber)
103:                    throws IOException {
104:                return null;
105:            }
106:        }
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