Source Code Cross Referenced for XAXactId.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » store » access » xa » 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.access.xa 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.iapi.store.access.xa.XAXactId
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.access.xa;
023:
024:        import org.apache.derby.iapi.services.sanity.SanityManager;
025:
026:        import org.apache.derby.iapi.store.access.GlobalXact;
027:
028:        import javax.transaction.xa.Xid;
029:        import javax.transaction.xa.XAException;
030:
031:        /**
032:
033:         The XAXactId class is a specific implementation of the JTA Xid interface.  It
034:         is only used by the TransactionTable.restore() interface to return an array
035:         of Xid's back to the caller, as part of serving the XAresource.restore() 
036:         interface.
037:         <P>
038:         It is NOT the object that is stored in the log.  One reason for this is that
039:         the Formattable and Xid interface's define two different return values for
040:         the getFormatId() interface.
041:
042:         **/
043:
044:        public class XAXactId extends GlobalXact implements  Xid {
045:            /**************************************************************************
046:             * Private Fields of the class
047:             **************************************************************************
048:             */
049:            private static final char COLON = ':';
050:
051:            /**************************************************************************
052:             * Constructors for This class:
053:             **************************************************************************
054:             */
055:
056:            /**
057:             * initialize by making array copies of appropriate fields.
058:             * <p>
059:             **/
060:            private void copy_init_xid(int format_id, byte[] global_id,
061:                    byte[] branch_id) {
062:                this .format_id = format_id;
063:                this .global_id = new byte[global_id.length];
064:                System.arraycopy(global_id, 0, this .global_id, 0,
065:                        global_id.length);
066:                this .branch_id = new byte[branch_id.length];
067:                System.arraycopy(branch_id, 0, this .branch_id, 0,
068:                        branch_id.length);
069:            }
070:
071:            /**
072:             * Construct from given pieces of an Xid.  Makes copies of arrays.
073:             * <p>
074:             **/
075:            public XAXactId(int format_id, byte[] global_id, byte[] branch_id) {
076:                copy_init_xid(format_id, global_id, branch_id);
077:            }
078:
079:            /**
080:             * Construct an Xid using an external Xid.
081:             * <p>
082:             * @exception XAException invalid external xid
083:             */
084:            public XAXactId(Xid xid) throws XAException {
085:                if (xid == null)
086:                    throw new XAException(XAException.XAER_NOTA);
087:
088:                copy_init_xid(xid.getFormatId(), xid.getGlobalTransactionId(),
089:                        xid.getBranchQualifier());
090:            }
091:
092:            public String toHexString() {
093:                // the ascii representation of xid where xid is of 
094:                // 		format_id = f
095:                //		global_id = byte[N]
096:                //		branch_id = byte[M]
097:                //
098:                // :xx:yy:ffffffff:n...n:mmmm...m:
099:                // where	xx = N (up to 64 max)
100:                //			yy = M (up to 64 max)
101:                //			n..n = hex dump of global_id (0 to 128 bytes max)
102:                //			m..m = hex dump of branch_qualifier (0 to 128 bytes max)
103:
104:                // 1+2+1+2+1+9+1+1+1
105:                int maxLength = 20 + (global_id.length + branch_id.length) * 2;
106:
107:                StringBuffer hexdump = new StringBuffer(maxLength);
108:                hexdump.append(COLON)
109:                        .append(Integer.toString(global_id.length)).append(
110:                                COLON).append(
111:                                Integer.toString(branch_id.length)).append(
112:                                COLON).append(Integer.toString(format_id, 16))
113:                        .append(COLON).append(
114:                                org.apache.derby.iapi.util.StringUtil
115:                                        .toHexString(global_id, 0,
116:                                                global_id.length))
117:                        .append(COLON).append(
118:                                org.apache.derby.iapi.util.StringUtil
119:                                        .toHexString(branch_id, 0,
120:                                                branch_id.length))
121:                        .append(COLON);
122:
123:                return hexdump.toString();
124:
125:            }
126:
127:            public XAXactId(String xactIdString) {
128:                // extract it in pieces delimited by COLON
129:                int start, end, length;
130:
131:                // xx
132:                start = 1;
133:                end = xactIdString.indexOf(COLON, start);
134:                if (SanityManager.DEBUG)
135:                    SanityManager.ASSERT(end != -1, "illegal string format");
136:
137:                String xx = xactIdString.substring(start, end);
138:                int N = Integer.parseInt(xx);
139:
140:                if (SanityManager.DEBUG) {
141:                    SanityManager.ASSERT(N > 0 && N <= Xid.MAXGTRIDSIZE,
142:                            "illegal gtrid size");
143:                }
144:
145:                // yy
146:                start = end + 1; // skip the COLON
147:                end = xactIdString.indexOf(COLON, start);
148:                if (SanityManager.DEBUG)
149:                    SanityManager.ASSERT(end != -1, "illegal string format");
150:
151:                String yy = xactIdString.substring(start, end);
152:                int M = Integer.parseInt(yy);
153:
154:                if (SanityManager.DEBUG)
155:                    SanityManager.ASSERT(M > 0 && N <= Xid.MAXBQUALSIZE,
156:                            "illegal bqual size");
157:
158:                // ffffffff
159:                start = end + 1; // skip the COLON
160:                end = xactIdString.indexOf(COLON, start);
161:                if (SanityManager.DEBUG)
162:                    SanityManager.ASSERT(end != -1, "illegal string format");
163:
164:                String f = xactIdString.substring(start, end);
165:                format_id = Integer.parseInt(f, 16);
166:
167:                // n...n
168:                start = end + 1; // skip the COLON
169:                end = xactIdString.indexOf(COLON, start);
170:                if (SanityManager.DEBUG)
171:                    SanityManager.ASSERT(end != -1, "illegal string format");
172:
173:                global_id = org.apache.derby.iapi.util.StringUtil
174:                        .fromHexString(xactIdString, start, (end - start));
175:
176:                if (SanityManager.DEBUG)
177:                    SanityManager.ASSERT(global_id.length == N,
178:                            "inconsistent global_id length");
179:
180:                // m...m
181:                start = end + 1; // skip the COLON
182:                end = xactIdString.indexOf(COLON, start);
183:                if (SanityManager.DEBUG)
184:                    SanityManager.ASSERT(end != -1, "illegal string format");
185:
186:                branch_id = org.apache.derby.iapi.util.StringUtil
187:                        .fromHexString(xactIdString, start, (end - start));
188:
189:                if (SanityManager.DEBUG)
190:                    SanityManager.ASSERT(branch_id.length == M,
191:                            "inconsistent branch_id length, expect " + M
192:                                    + " got " + branch_id.length);
193:
194:            }
195:
196:            /**************************************************************************
197:             * Private/Protected methods of This class:
198:             **************************************************************************
199:             */
200:
201:            /**************************************************************************
202:             * Public Methods implementing the Xid interface: 
203:             **************************************************************************
204:             */
205:
206:            /**
207:             * Obtain the format id part of the Xid.
208:             * <p>
209:             *
210:             * @return Format identifier. O means the OSI CCR format.
211:             **/
212:            public int getFormatId() {
213:                return (format_id);
214:            }
215:
216:            /**
217:             * Obtain the global transaction identifier part of XID as an array of 
218:             * bytes.
219:             * <p>
220:             *
221:             * @return A byte array containing the global transaction identifier.
222:             **/
223:            public byte[] getGlobalTransactionId() {
224:                return (global_id);
225:            }
226:
227:            /**
228:             * Obtain the transaction branch qualifier part of the Xid in a byte array.
229:             * <p>
230:             *
231:             * @return A byte array containing the branch qualifier of the transaction.
232:             **/
233:            public byte[] getBranchQualifier() {
234:                return (branch_id);
235:            }
236:
237:            public boolean equals(Object other) {
238:                if (other == this )
239:                    return true;
240:
241:                if (other == null)
242:                    return false;
243:
244:                try {
245:                    if (other instanceof  GlobalXact)
246:                        return super .equals(other);
247:                    // Just cast it and catch the exception rather than doing the type
248:                    // checking twice.
249:                    Xid other_xid = (Xid) other;
250:
251:                    return (java.util.Arrays.equals(other_xid
252:                            .getGlobalTransactionId(), this .global_id)
253:                            && java.util.Arrays.equals(other_xid
254:                                    .getBranchQualifier(), this .branch_id) && other_xid
255:                            .getFormatId() == this .format_id);
256:
257:                } catch (ClassCastException cce) {
258:                    // this class only knows how to compare with other Xids
259:                    if (SanityManager.DEBUG)
260:                        SanityManager.THROWASSERT("comparing XAXactId with "
261:                                + other.getClass().getName());
262:
263:                    return false;
264:                }
265:            }
266:
267:        }
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