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package org.apache.camel.component.jpa; |
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import java.lang.reflect.Method; |
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import java.util.List; |
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import javax.persistence.EntityManager; |
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import javax.persistence.LockModeType; |
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import javax.persistence.PersistenceException; |
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import javax.persistence.Query; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Processor; |
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import org.apache.camel.impl.ScheduledPollConsumer; |
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import org.apache.camel.util.ObjectHelper; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import org.springframework.orm.jpa.JpaCallback; |
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public class JpaConsumer extends ScheduledPollConsumer<Exchange> { |
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private static final transient Log log = LogFactory.getLog(JpaConsumer.class); |
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private final JpaEndpoint endpoint; |
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private final TransactionStrategy template; |
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private QueryFactory queryFactory; |
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private DeleteHandler<Object> deleteHandler; |
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private String query; |
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private String namedQuery; |
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private String nativeQuery; |
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public JpaConsumer(JpaEndpoint endpoint, Processor processor) { |
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super(endpoint, processor); |
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this.endpoint = endpoint; |
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this.template = endpoint.createTransactionStrategy(); |
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} |
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protected void poll() throws Exception { |
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template.execute(new JpaCallback() { |
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public Object doInJpa(EntityManager entityManager) throws PersistenceException { |
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Query query = getQueryFactory().createQuery(entityManager); |
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configureParameters(query); |
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List results = query.getResultList(); |
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for (Object result : results) { |
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if (log.isDebugEnabled()) { |
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log.debug("Processing new entity: " + result); |
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} |
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if (lockEntity(result, entityManager)) { |
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Exchange exchange = createExchange(result); |
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try { |
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getProcessor().process(exchange); |
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} catch (Exception e) { |
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throw new PersistenceException(e); |
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} |
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getDeleteHandler().deleteObject(entityManager, result); |
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} |
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} |
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entityManager.flush(); |
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return null; |
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} |
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}); |
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} |
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public JpaEndpoint getEndpoint() { |
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return endpoint; |
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} |
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public QueryFactory getQueryFactory() { |
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if (queryFactory == null) { |
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queryFactory = createQueryFactory(); |
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if (queryFactory == null) { |
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throw new IllegalArgumentException("No queryType property configured on this consumer, nor an entityType configured on the endpoint so cannot consume"); |
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} |
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} |
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return queryFactory; |
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} |
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public void setQueryFactory(QueryFactory queryFactory) { |
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this.queryFactory = queryFactory; |
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} |
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public DeleteHandler getDeleteHandler() { |
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if (deleteHandler == null) { |
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deleteHandler = createDeleteHandler(); |
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} |
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return deleteHandler; |
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} |
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public void setDeleteHandler(DeleteHandler deleteHandler) { |
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this.deleteHandler = deleteHandler; |
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} |
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public String getNamedQuery() { |
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return namedQuery; |
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} |
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public void setNamedQuery(String namedQuery) { |
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this.namedQuery = namedQuery; |
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} |
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public String getNativeQuery() { |
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return nativeQuery; |
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} |
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public void setNativeQuery(String nativeQuery) { |
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this.nativeQuery = nativeQuery; |
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} |
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public String getQuery() { |
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return query; |
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} |
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public void setQuery(String query) { |
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this.query = query; |
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} |
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protected boolean lockEntity(Object entity, EntityManager entityManager) { |
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try { |
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if (log.isDebugEnabled()) { |
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log.debug("Acquiring exclusive lock on entity: " + entity); |
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} |
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entityManager.lock(entity, LockModeType.WRITE); |
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return true; |
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} |
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catch (Exception e) { |
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if (log.isDebugEnabled()) { |
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log.debug("Failed to achieve lock on entity: " + entity + ". Reason: " + e, e); |
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} |
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return false; |
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} |
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} |
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protected QueryFactory createQueryFactory() { |
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if (query != null) { |
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return QueryBuilder.query(query); |
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} |
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else if (namedQuery != null) { |
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return QueryBuilder.namedQuery(namedQuery); |
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} |
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else if (nativeQuery != null) { |
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return QueryBuilder.nativeQuery(nativeQuery); |
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} |
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else { |
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Class<?> entityType = endpoint.getEntityType(); |
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if (entityType == null) { |
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return null; |
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} |
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else { |
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return QueryBuilder.query("select x from " + entityType.getName() + " x"); |
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} |
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} |
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} |
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protected DeleteHandler<Object> createDeleteHandler() { |
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Class<?> entityType = getEndpoint().getEntityType(); |
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if (entityType != null) { |
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List<Method> methods = ObjectHelper.findMethodsWithAnnotation(entityType, Consumed.class); |
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if (methods.size() > 1) { |
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throw new IllegalArgumentException("Only one method can be annotated with the @Consumed annotation but found: " + methods); |
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} |
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else if (methods.size() == 1) { |
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final Method method = methods.get(0); |
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return new DeleteHandler<Object>() { |
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public void deleteObject(EntityManager entityManager, Object entityBean) { |
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ObjectHelper.invokeMethod(method, entityBean); |
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} |
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}; |
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} |
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} |
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return new DeleteHandler<Object>() { |
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public void deleteObject(EntityManager entityManager, Object entityBean) { |
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entityManager.remove(entityBean); |
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} |
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}; |
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} |
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protected void configureParameters(Query query) { |
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int maxResults = endpoint.getMaximumResults(); |
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if (maxResults > 0) { |
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query.setMaxResults(maxResults); |
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} |
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} |
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protected Exchange createExchange(Object result) { |
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Exchange exchange = endpoint.createExchange(); |
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exchange.getIn().setBody(result); |
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return exchange; |
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} |
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} |