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/* |
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* Copyright 2002-2007 the original author or authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package org.springframework.transaction.interceptor; |
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import java.lang.reflect.Method; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.List; |
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import org.springframework.beans.factory.InitializingBean; |
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import org.springframework.metadata.Attributes; |
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import org.springframework.util.Assert; |
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import org.springframework.util.ObjectUtils; |
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/** |
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* Implementation of the {@link TransactionAttributeSource} interface that reads |
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* metadata via Spring's {@link org.springframework.metadata.Attributes} abstraction. |
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* |
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* <p>Typically used for reading in source-level attributes via Commons Attributes. |
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* |
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* @author Rod Johnson |
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* @author Juergen Hoeller |
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* @see org.springframework.metadata.Attributes |
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* @see org.springframework.metadata.commons.CommonsAttributes |
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*/ |
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public class AttributesTransactionAttributeSource extends AbstractFallbackTransactionAttributeSource |
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implements InitializingBean { |
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/** |
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* Underlying Attributes implementation that we're using. |
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*/ |
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private Attributes attributes; |
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/** |
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* Create a new AttributesTransactionAttributeSource. |
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* @see #setAttributes |
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*/ |
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public AttributesTransactionAttributeSource() { |
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} |
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/** |
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* Create a new AttributesTransactionAttributeSource. |
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* @param attributes the Attributes implementation to use |
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* @see org.springframework.metadata.commons.CommonsAttributes |
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*/ |
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public AttributesTransactionAttributeSource(Attributes attributes) { |
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Assert.notNull(attributes, "Attributes must not be null"); |
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this.attributes = attributes; |
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} |
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/** |
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* Set the Attributes implementation to use. |
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* @see org.springframework.metadata.commons.CommonsAttributes |
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*/ |
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public void setAttributes(Attributes attributes) { |
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this.attributes = attributes; |
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} |
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public void afterPropertiesSet() { |
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Assert.notNull(this.attributes, "Property 'attributes' is required"); |
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} |
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protected TransactionAttribute findTransactionAttribute(Method method) { |
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Assert.notNull(this.attributes, "Property 'attributes' is required"); |
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return findTransactionAttribute(this.attributes.getAttributes(method)); |
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} |
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protected TransactionAttribute findTransactionAttribute(Class clazz) { |
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Assert.notNull(this.attributes, "Property 'attributes' is required"); |
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return findTransactionAttribute(this.attributes.getAttributes(clazz)); |
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} |
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/** |
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* Return the transaction attribute, given this set of attributes |
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* attached to a method or class. |
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* <p>Protected rather than private as subclasses may want to customize |
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* how this is done: for example, returning a TransactionAttribute |
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* affected by the values of other attributes. |
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* <p>This implementation takes into account RollbackRuleAttributes, |
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* if the TransactionAttribute is a RuleBasedTransactionAttribute. |
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* @param atts attributes attached to a method or class (may be <code>null</code>) |
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* @return TransactionAttribute the corresponding transaction attribute, |
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* or <code>null</code> if none was found |
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*/ |
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protected TransactionAttribute findTransactionAttribute(Collection atts) { |
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if (atts == null) { |
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return null; |
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} |
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TransactionAttribute txAttribute = null; |
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// Check whether there is a transaction attribute.
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for (Iterator it = atts.iterator(); it.hasNext() && txAttribute == null; ) { |
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Object att = it.next(); |
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if (att instanceof TransactionAttribute) { |
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txAttribute = (TransactionAttribute) att; |
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} |
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} |
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// Check if we have a RuleBasedTransactionAttribute.
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if (txAttribute instanceof RuleBasedTransactionAttribute) { |
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RuleBasedTransactionAttribute rbta = (RuleBasedTransactionAttribute) txAttribute; |
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// We really want value: bit of a hack.
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List rollbackRules = new LinkedList(); |
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for (Iterator it = atts.iterator(); it.hasNext(); ) { |
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Object att = it.next(); |
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if (att instanceof RollbackRuleAttribute) { |
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rollbackRules.add(att); |
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} |
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} |
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// Repeatedly setting this isn't elegant, but it works.
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rbta.setRollbackRules(rollbackRules); |
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} |
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return txAttribute; |
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} |
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public boolean equals(Object other) { |
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if (this == other) { |
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return true; |
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} |
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if (!(other instanceof AttributesTransactionAttributeSource)) { |
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return false; |
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} |
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AttributesTransactionAttributeSource otherTas = (AttributesTransactionAttributeSource) other; |
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return ObjectUtils.nullSafeEquals(this.attributes, otherTas.attributes); |
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} |
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public int hashCode() { |
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return AttributesTransactionAttributeSource.class.hashCode(); |
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} |
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} |
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