Source Code Cross Referenced for ResourceHolderSupport.java in  » J2EE » spring-framework-2.5 » org » springframework » transaction » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.transaction.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
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.springframework.transaction.support;
018:
019:        import java.util.Date;
020:
021:        import org.springframework.transaction.TransactionTimedOutException;
022:
023:        /**
024:         * Convenient base class for resource holders.
025:         *
026:         * <p>Features rollback-only support for nested transactions.
027:         * Can expire after a certain number of seconds or milliseconds,
028:         * to determine transactional timeouts.
029:         *
030:         * @author Juergen Hoeller
031:         * @since 02.02.2004
032:         * @see org.springframework.jdbc.datasource.DataSourceTransactionManager#doBegin
033:         * @see org.springframework.jdbc.datasource.DataSourceUtils#applyTransactionTimeout
034:         */
035:        public abstract class ResourceHolderSupport {
036:
037:            private boolean synchronizedWithTransaction = false;
038:
039:            private boolean rollbackOnly = false;
040:
041:            private Date deadline;
042:
043:            private int referenceCount = 0;
044:
045:            /**
046:             * Mark the resource as synchronized with a transaction.
047:             */
048:            public void setSynchronizedWithTransaction(
049:                    boolean synchronizedWithTransaction) {
050:                this .synchronizedWithTransaction = synchronizedWithTransaction;
051:            }
052:
053:            /**
054:             * Return whether the resource is synchronized with a transaction.
055:             */
056:            public boolean isSynchronizedWithTransaction() {
057:                return this .synchronizedWithTransaction;
058:            }
059:
060:            /**
061:             * Mark the resource transaction as rollback-only.
062:             */
063:            public void setRollbackOnly() {
064:                this .rollbackOnly = true;
065:            }
066:
067:            /**
068:             * Return whether the resource transaction is marked as rollback-only.
069:             */
070:            public boolean isRollbackOnly() {
071:                return this .rollbackOnly;
072:            }
073:
074:            /**
075:             * Set the timeout for this object in seconds.
076:             * @param seconds number of seconds until expiration
077:             */
078:            public void setTimeoutInSeconds(int seconds) {
079:                setTimeoutInMillis(seconds * 1000);
080:            }
081:
082:            /**
083:             * Set the timeout for this object in milliseconds.
084:             * @param millis number of milliseconds until expiration
085:             */
086:            public void setTimeoutInMillis(long millis) {
087:                this .deadline = new Date(System.currentTimeMillis() + millis);
088:            }
089:
090:            /**
091:             * Return whether this object has an associated timeout.
092:             */
093:            public boolean hasTimeout() {
094:                return (this .deadline != null);
095:            }
096:
097:            /**
098:             * Return the expiration deadline of this object.
099:             * @return the deadline as Date object
100:             */
101:            public Date getDeadline() {
102:                return this .deadline;
103:            }
104:
105:            /**
106:             * Return the time to live for this object in seconds.
107:             * Rounds up eagerly, e.g. 9.00001 still to 10.
108:             * @return number of seconds until expiration
109:             * @throws TransactionTimedOutException if the deadline has already been reached
110:             */
111:            public int getTimeToLiveInSeconds() {
112:                double diff = ((double) getTimeToLiveInMillis()) / 1000;
113:                int secs = (int) Math.ceil(diff);
114:                checkTransactionTimeout(secs <= 0);
115:                return secs;
116:            }
117:
118:            /**
119:             * Return the time to live for this object in milliseconds.
120:             * @return number of millseconds until expiration
121:             * @throws TransactionTimedOutException if the deadline has already been reached
122:             */
123:            public long getTimeToLiveInMillis()
124:                    throws TransactionTimedOutException {
125:                if (this .deadline == null) {
126:                    throw new IllegalStateException(
127:                            "No timeout specified for this resource holder");
128:                }
129:                long timeToLive = this .deadline.getTime()
130:                        - System.currentTimeMillis();
131:                checkTransactionTimeout(timeToLive <= 0);
132:                return timeToLive;
133:            }
134:
135:            /**
136:             * Set the transaction rollback-only if the deadline has been reached,
137:             * and throw a TransactionTimedOutException.
138:             */
139:            private void checkTransactionTimeout(boolean deadlineReached)
140:                    throws TransactionTimedOutException {
141:                if (deadlineReached) {
142:                    setRollbackOnly();
143:                    throw new TransactionTimedOutException(
144:                            "Transaction timed out: deadline was "
145:                                    + this .deadline);
146:                }
147:            }
148:
149:            /**
150:             * Increase the reference count by one because the holder has been requested
151:             * (i.e. someone requested the resource held by it).
152:             */
153:            public void requested() {
154:                this .referenceCount++;
155:            }
156:
157:            /**
158:             * Decrease the reference count by one because the holder has been released
159:             * (i.e. someone released the resource held by it).
160:             */
161:            public void released() {
162:                this .referenceCount--;
163:            }
164:
165:            /**
166:             * Return whether there are still open references to this holder.
167:             */
168:            public boolean isOpen() {
169:                return (this .referenceCount > 0);
170:            }
171:
172:            /**
173:             * Clear the transactional state of this resource holder.
174:             */
175:            public void clear() {
176:                this .synchronizedWithTransaction = false;
177:                this .rollbackOnly = false;
178:                this .deadline = null;
179:            }
180:
181:            /**
182:             * Reset this resource holder - transactional state as well as reference count.
183:             */
184:            public void reset() {
185:                clear();
186:                this .referenceCount = 0;
187:            }
188:
189:        }
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