Source Code Cross Referenced for RuleBasedTransactionAttribute.java in  » J2EE » spring-framework-2.0.6 » org » springframework » transaction » interceptor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.transaction.interceptor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 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.interceptor;
018:
019:        import java.io.Serializable;
020:        import java.util.ArrayList;
021:        import java.util.Iterator;
022:        import java.util.LinkedList;
023:        import java.util.List;
024:
025:        import org.apache.commons.logging.Log;
026:        import org.apache.commons.logging.LogFactory;
027:
028:        /**
029:         * TransactionAttribute implementation that works out whether a given exception
030:         * should cause transaction rollback by applying a number of rollback rules,
031:         * both positive and negative. If no rules are relevant to the exception, it
032:         * behaves like DefaultTransactionAttribute (rolling back on runtime exceptions).
033:         *
034:         * <p>TransactionAttributeEditor creates objects of this class.
035:         *
036:         * @author Rod Johnson
037:         * @author Juergen Hoeller
038:         * @since 09.04.2003
039:         * @see TransactionAttributeEditor
040:         */
041:        public class RuleBasedTransactionAttribute extends
042:                DefaultTransactionAttribute implements  Serializable {
043:
044:            /** Prefix for rollback-on-exception rules in description strings */
045:            public static final String PREFIX_ROLLBACK_RULE = "-";
046:
047:            /** Prefix for commit-on-exception rules in description strings */
048:            public static final String PREFIX_COMMIT_RULE = "+";
049:
050:            /** Static for optimal serializability */
051:            private static final Log logger = LogFactory
052:                    .getLog(RuleBasedTransactionAttribute.class);
053:
054:            private List rollbackRules;
055:
056:            /**
057:             * Create a new RuleBasedTransactionAttribute, with default settings.
058:             * Can be modified through bean property setters.
059:             * @see #setPropagationBehavior
060:             * @see #setIsolationLevel
061:             * @see #setTimeout
062:             * @see #setReadOnly
063:             * @see #setName
064:             * @see #setRollbackRules
065:             */
066:            public RuleBasedTransactionAttribute() {
067:                super ();
068:            }
069:
070:            /**
071:             * Copy constructor. Definition can be modified through bean property setters.
072:             * @see #setPropagationBehavior
073:             * @see #setIsolationLevel
074:             * @see #setTimeout
075:             * @see #setReadOnly
076:             * @see #setName
077:             * @see #setRollbackRules
078:             */
079:            public RuleBasedTransactionAttribute(
080:                    RuleBasedTransactionAttribute other) {
081:                super (other);
082:                this .rollbackRules = new ArrayList(other.rollbackRules);
083:            }
084:
085:            /**
086:             * Create a new DefaultTransactionAttribute with the the given
087:             * propagation behavior. Can be modified through bean property setters.
088:             * @param propagationBehavior one of the propagation constants in the
089:             * TransactionDefinition interface
090:             * @param rollbackRules the list of RollbackRuleAttributes to apply
091:             * @see #setIsolationLevel
092:             * @see #setTimeout
093:             * @see #setReadOnly
094:             */
095:            public RuleBasedTransactionAttribute(int propagationBehavior,
096:                    List rollbackRules) {
097:                super (propagationBehavior);
098:                this .rollbackRules = rollbackRules;
099:            }
100:
101:            /**
102:             * Set the list of <code>RollbackRuleAttribute</code> objects
103:             * (and/or <code>NoRollbackRuleAttribute</code> objects) to apply.
104:             * @see RollbackRuleAttribute
105:             * @see NoRollbackRuleAttribute
106:             */
107:            public void setRollbackRules(List rollbackRules) {
108:                this .rollbackRules = rollbackRules;
109:            }
110:
111:            /**
112:             * Return the list of <code>RollbackRuleAttribute</code> objects
113:             * (never <code>null</code>).
114:             */
115:            public List getRollbackRules() {
116:                if (this .rollbackRules == null) {
117:                    this .rollbackRules = new LinkedList();
118:                }
119:                return this .rollbackRules;
120:            }
121:
122:            /**
123:             * Winning rule is the shallowest rule (that is, the closest in the
124:             * inheritance hierarchy to the exception). If no rule applies (-1),
125:             * return false.
126:             * @see TransactionAttribute#rollbackOn(java.lang.Throwable)
127:             */
128:            public boolean rollbackOn(Throwable ex) {
129:                if (logger.isDebugEnabled()) {
130:                    logger
131:                            .debug("Applying rules to determine whether transaction should rollback on "
132:                                    + ex);
133:                }
134:
135:                RollbackRuleAttribute winner = null;
136:                int deepest = Integer.MAX_VALUE;
137:
138:                if (this .rollbackRules != null) {
139:                    for (Iterator it = this .rollbackRules.iterator(); it
140:                            .hasNext();) {
141:                        RollbackRuleAttribute rule = (RollbackRuleAttribute) it
142:                                .next();
143:                        int depth = rule.getDepth(ex);
144:                        if (depth >= 0 && depth < deepest) {
145:                            deepest = depth;
146:                            winner = rule;
147:                        }
148:                    }
149:                }
150:
151:                if (logger.isDebugEnabled()) {
152:                    logger.debug("Winning rollback rule is: " + winner);
153:                }
154:
155:                // User superclass behavior (rollback on unchecked) if no rule matches.
156:                if (winner == null) {
157:                    logger
158:                            .debug("No relevant rollback rule found: applying superclass default");
159:                    return super .rollbackOn(ex);
160:                }
161:
162:                return !(winner instanceof  NoRollbackRuleAttribute);
163:            }
164:
165:            public String toString() {
166:                StringBuffer result = getDefinitionDescription();
167:                if (this .rollbackRules != null) {
168:                    for (Iterator it = this .rollbackRules.iterator(); it
169:                            .hasNext();) {
170:                        RollbackRuleAttribute rule = (RollbackRuleAttribute) it
171:                                .next();
172:                        String sign = (rule instanceof  NoRollbackRuleAttribute ? PREFIX_COMMIT_RULE
173:                                : PREFIX_ROLLBACK_RULE);
174:                        result.append(',').append(sign).append(
175:                                rule.getExceptionName());
176:                    }
177:                }
178:                return result.toString();
179:            }
180:
181:        }
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