Source Code Cross Referenced for ObjectContainer.java in  » Database-DBMS » Ozone-1.1 » org » ozoneDB » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Ozone 1.1 » org.ozoneDB.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // You can redistribute this software and/or modify it under the terms of
002:        // the Ozone Core License version 1 published by ozone-db.org.
003:        //
004:        // The original code and portions created by SMB are
005:        // Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.
006:        //
007:        // $Id: ObjectContainer.java,v 1.2 2002/06/08 00:49:38 mediumnet Exp $
008:
009:        package org.ozoneDB.core;
010:
011:        import java.io.*;
012:        import java.util.*;
013:        import org.ozoneDB.DxLib.*;
014:        import org.ozoneDB.*;
015:        import org.ozoneDB.core.dr.*;
016:
017:        /**
018:         * Together with the {@link StoreManager} interface this is part of the
019:         * StoreManager back-end API.<p>
020:         * 
021:         * An ObjectContainer wraps a target (database) object and decorates it with
022:         * functionality needed by the database system, such as the corresponding object
023:         * ID. Also, the ObjectContainer is the delegate for the methods defined by
024:         * {@link OzoneCompatible}.
025:         * 
026:         * 
027:         * @author <a href="http://www.softwarebuero.de/">SMB</a>
028:         * @author <A HREF="http://www.medium.net/">Medium.net</A>
029:         * @version $Revision: 1.2 $Date: 2002/06/08 00:49:38 $
030:         */
031:        public interface ObjectContainer extends Lockable {
032:
033:            public final static String PROXYNAME_POSTFIX = "_Proxy";
034:            public final static String IMPLNAME_POSTFIX = "_Impl";
035:
036:            // possible return values of the state() method
037:            public final static int STATE_CLEAN = 0;
038:            public final static int STATE_READ = 1;
039:            public final static int STATE_MODIFIED = 2;
040:            public final static int STATE_CREATED = 4;
041:            public final static int STATE_DELETED = 8;
042:
043:            /**
044:             * Return the current state of the container. Possible return values are the
045:             * STATE constants defined in this class. A container can only be in one of
046:             * these states at one time. The state of a container can only be raised
047:             * during one transaction. So, if a container is created (STATE_CREATED)
048:             * during a transaction, the state can become STATE_DELETED only.
049:             * 
050:             * 
051:             * @return The state of the container.
052:             */
053:            public int state();
054:
055:            /**
056:             * Returns the time when the container was last commited with lock level
057:             * greater than {@link LEVEL_READ}. The value returned by this method should
058:             * only be compared against return values of this method.
059:             */
060:            public long modTime();
061:
062:            public Lock lock();
063:
064:            public void touch();
065:
066:            public void setName(String _name);
067:
068:            public String name();
069:
070:            public void setTarget(OzoneCompatible _target);
071:
072:            public OzoneCompatible target();
073:
074:            public Class targetClass();
075:
076:            public void createTarget(Env env, Class cl, String sig,
077:                    Object[] args) throws Exception;
078:
079:            public Object invokeTarget(Env env, String methodName, String sig,
080:                    Object[] args) throws Exception;
081:
082:            public Object invokeTarget(Env env, int methodIndex, Object[] args)
083:                    throws Exception;
084:
085:            public void deleteTarget();
086:
087:            public void nameTarget(String _name);
088:
089:            public OzoneCompatible targetClone() throws Exception;
090:
091:            /**
092:             * @return True if obj and receiver point to the same target object.
093:             */
094:            public boolean equals(Object obj);
095:
096:            /**
097:             * Return a proxy for the receiver.
098:             * @return Proxy for this object.
099:             */
100:            public OzoneProxy ozoneProxy();
101:
102:            public ObjectID id();
103:
104:            public OzoneInterface database();
105:
106:            public Permissions permissions();
107:
108:            /**
109:            	Pins this ObjectContainer.
110:            	Every caller of this method must pair this call with a call to {@link #unpin}.
111:            	An ObjectContainer remains in main memory at least as long as it is pinned.
112:             */
113:            public void pin();
114:
115:            /**
116:            	Unpins this ObjectContainer.
117:            	This method must be called exactly once for every call to {@link #pin}.
118:             */
119:            public void unpin();
120:
121:            /**
122:            	Returns wether this ObjectContainer is pinned.
123:             */
124:            public boolean isPinned();
125:
126:            /**
127:            	Ensures that the garbageCollectionLevel is at least the given currentGarbageCollectionLevel.
128:            	The return value is meaningful if the supplied newGarbageCollectionLevel is the currentGarbageCollectionLevel
129:
130:            	@return
131:            		<=0 if this object still has to be processed.
132:            			This is the case if it belongs to the surelyReachable set but not to the processedReachable set
133:            		> otherwise
134:
135:            		<0 if this object has been updated
136:            		=0 if this object has not been updated, it is surelyReachable
137:            		>0 if this object has not been updated, it is processedReachable
138:             */
139:            public int ensureGarbageCollectionLevel(
140:                    int newGarbageCollectionLevel);
141:
142:            /**
143:            	Returns the garbageCollectionLevel this ObjectContainer has reached due to (not) calling {@link #ensureGarbageCollectionLevel}.
144:             */
145:            public int getGarbageCollectionLevel();
146:        }
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