Source Code Cross Referenced for ContainerKey.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » store » raw » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.store.raw 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.iapi.store.raw.ContainerKey
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.iapi.store.raw;
023:
024:        import org.apache.derby.iapi.util.Matchable;
025:        import org.apache.derby.iapi.services.io.CompressedNumber;
026:
027:        import java.io.ObjectOutput;
028:        import java.io.ObjectInput;
029:        import java.io.IOException;
030:
031:        import org.apache.derby.iapi.services.sanity.SanityManager;
032:        import org.apache.derby.iapi.services.locks.Lockable;
033:        import org.apache.derby.iapi.services.locks.Latch;
034:        import org.apache.derby.iapi.services.locks.VirtualLockTable;
035:
036:        import java.util.Hashtable;
037:
038:        /**
039:         A key that identifies a Container within the RawStore.
040:         <BR> MT - Immutable
041:         */
042:        public final class ContainerKey implements  Matchable, Lockable {
043:            private final long segmentId; // segment identifier
044:            private final long containerId; // container identifier
045:
046:            /**
047:            	Create a new ContainerKey
048:             */
049:            public ContainerKey(long segmentId, long containerId) {
050:                this .segmentId = segmentId;
051:                this .containerId = containerId;
052:            }
053:
054:            /**
055:            	Return my identifier within the segment
056:             */
057:            public long getContainerId() {
058:                return containerId;
059:            }
060:
061:            /**
062:            	Return my segment identifier
063:             */
064:            public long getSegmentId() {
065:                return segmentId;
066:            }
067:
068:            /*
069:             ** Methods to read and write ContainerKeys.
070:             */
071:
072:            public void writeExternal(ObjectOutput out) throws IOException {
073:                CompressedNumber.writeLong(out, segmentId);
074:                CompressedNumber.writeLong(out, containerId);
075:            }
076:
077:            public static ContainerKey read(ObjectInput in) throws IOException {
078:                long sid = CompressedNumber.readLong(in);
079:                long cid = CompressedNumber.readLong(in);
080:
081:                return new ContainerKey(sid, cid);
082:            }
083:
084:            /*
085:             ** Methods of Object
086:             */
087:
088:            public boolean equals(Object other) {
089:                if (other == this )
090:                    return true;
091:
092:                if (other instanceof  ContainerKey) {
093:                    ContainerKey otherKey = (ContainerKey) other;
094:
095:                    return (containerId == otherKey.containerId)
096:                            && (segmentId == otherKey.segmentId);
097:                } else {
098:                    return false;
099:                }
100:            }
101:
102:            public int hashCode() {
103:
104:                return (int) (segmentId ^ containerId);
105:            }
106:
107:            public String toString() {
108:
109:                return "Container(" + segmentId + ", " + containerId + ")";
110:            }
111:
112:            /*
113:             ** methods of Matchable
114:             */
115:
116:            public boolean match(Object key) {
117:                // instance of ContainerKey?
118:                if (equals(key))
119:                    return true;
120:
121:                if (key instanceof  PageKey)
122:                    return equals(((PageKey) key).getContainerId());
123:
124:                if (key instanceof  RecordHandle) {
125:                    return equals(((RecordHandle) key).getContainerId());
126:                }
127:                return false;
128:            }
129:
130:            /*
131:             ** Methods of Lockable
132:             */
133:
134:            public void lockEvent(Latch lockInfo) {
135:            }
136:
137:            public boolean requestCompatible(Object requestedQualifier,
138:                    Object grantedQualifier) {
139:                if (SanityManager.DEBUG) {
140:                    SanityManager
141:                            .ASSERT(requestedQualifier instanceof  ContainerLock);
142:                    SanityManager
143:                            .ASSERT(grantedQualifier instanceof  ContainerLock);
144:                }
145:
146:                ContainerLock clRequested = (ContainerLock) requestedQualifier;
147:                ContainerLock clGranted = (ContainerLock) grantedQualifier;
148:
149:                return clRequested.isCompatible(clGranted);
150:            }
151:
152:            /**
153:            	This method will only be called if requestCompatible returned false.
154:            	This results from two cases, some other compatabilty space has some
155:            	lock that would conflict with the request, or this compatability space
156:            	has a lock tha
157:             */
158:            public boolean lockerAlwaysCompatible() {
159:                return true;
160:            }
161:
162:            public void unlockEvent(Latch lockInfo) {
163:            }
164:
165:            /**
166:            	This lockable wants to participate in the Virtual Lock table.
167:             */
168:            public boolean lockAttributes(int flag, Hashtable attributes) {
169:                if (SanityManager.DEBUG) {
170:                    SanityManager
171:                            .ASSERT(attributes != null,
172:                                    "cannot call lockProperties with null attribute list");
173:                }
174:
175:                if ((flag & VirtualLockTable.TABLE_AND_ROWLOCK) == 0)
176:                    return false;
177:
178:                attributes.put(VirtualLockTable.CONTAINERID, new Long(
179:                        getContainerId()));
180:                attributes.put(VirtualLockTable.LOCKNAME, "Tablelock");
181:                attributes.put(VirtualLockTable.LOCKTYPE, "TABLE");
182:
183:                // attributes.put(VirtualLockTable.SEGMENTID, new Long(identity.getSegmentId()));
184:
185:                return true;
186:            }
187:        }
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