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package org.apache.camel.processor.idempotent.jpa; |
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import java.util.List; |
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import javax.persistence.EntityManagerFactory; |
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import javax.persistence.Persistence; |
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import org.apache.camel.processor.idempotent.MessageIdRepository; |
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import org.springframework.orm.jpa.JpaTemplate; |
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import org.springframework.orm.jpa.JpaTransactionManager; |
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import org.springframework.transaction.TransactionDefinition; |
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import org.springframework.transaction.TransactionStatus; |
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import org.springframework.transaction.support.TransactionCallback; |
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import org.springframework.transaction.support.TransactionTemplate; |
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public class JpaMessageIdRepository implements MessageIdRepository { |
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protected static final String QUERY_STRING = "select x from " + MessageProcessed.class.getName() + " x where x.processorName = ?1 and x.messageId = ?2"; |
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private JpaTemplate jpaTemplate; |
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private String processorName; |
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private TransactionTemplate transactionTemplate; |
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public JpaMessageIdRepository(JpaTemplate template, String processorName) { |
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this(template, createTransactionTemplate(template), processorName); |
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} |
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public JpaMessageIdRepository(JpaTemplate template, TransactionTemplate transactionTemplate, String processorName) { |
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this.jpaTemplate = template; |
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this.processorName = processorName; |
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this.transactionTemplate = transactionTemplate; |
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} |
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public static JpaMessageIdRepository jpaMessageIdRepository(String persistenceUnit, String processorName) { |
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EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnit); |
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return jpaMessageIdRepository(new JpaTemplate(entityManagerFactory), processorName); |
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} |
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public static JpaMessageIdRepository jpaMessageIdRepository(JpaTemplate jpaTemplate, String processorName) { |
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return new JpaMessageIdRepository(jpaTemplate, processorName); |
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} |
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private static TransactionTemplate createTransactionTemplate(JpaTemplate jpaTemplate) { |
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TransactionTemplate transactionTemplate = new TransactionTemplate(); |
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transactionTemplate.setTransactionManager(new JpaTransactionManager(jpaTemplate.getEntityManagerFactory())); |
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transactionTemplate.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED); |
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return transactionTemplate; |
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} |
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public boolean contains(final String messageId) { |
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Boolean rc = (Boolean)transactionTemplate.execute(new TransactionCallback() { |
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public Object doInTransaction(TransactionStatus arg0) { |
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List list = jpaTemplate.find(QUERY_STRING, processorName, messageId); |
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if (list.isEmpty()) { |
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MessageProcessed processed = new MessageProcessed(); |
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processed.setProcessorName(processorName); |
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processed.setMessageId(messageId); |
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jpaTemplate.persist(processed); |
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jpaTemplate.flush(); |
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return Boolean.FALSE; |
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} else { |
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return Boolean.TRUE; |
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} |
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} |
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}); |
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return rc.booleanValue(); |
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} |
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} |