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package org.apache.camel.component.jpa; |
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import org.apache.camel.Consumer; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.NoTypeConversionAvailableException; |
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import org.apache.camel.Processor; |
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import org.apache.camel.Producer; |
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import org.apache.camel.builder.ExpressionBuilder; |
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import org.apache.camel.impl.DefaultExchange; |
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import org.apache.camel.impl.ScheduledPollEndpoint; |
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import org.apache.camel.util.IntrospectionSupport; |
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import org.springframework.orm.jpa.JpaTemplate; |
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import javax.persistence.EntityManager; |
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import javax.persistence.EntityManagerFactory; |
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import javax.persistence.Persistence; |
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import java.util.Map; |
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public class JpaEndpoint extends ScheduledPollEndpoint<Exchange> { |
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private EntityManagerFactory entityManagerFactory; |
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private String persistenceUnit = "camel"; |
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private JpaTemplate template; |
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private Expression<Exchange> producerExpression; |
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private int maximumResults = -1; |
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private Class<?> entityType; |
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private Map entityManagerProperties; |
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public JpaEndpoint(String uri, JpaComponent component) { |
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super(uri, component); |
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entityManagerFactory = component.getEntityManagerFactory(); |
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} |
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public Exchange createExchange() { |
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return new DefaultExchange(getContext()); |
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} |
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public Producer<Exchange> createProducer() throws Exception { |
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return new JpaProducer(this, getProducerExpression()); |
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} |
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public Consumer<Exchange> createConsumer(Processor processor) throws Exception { |
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JpaConsumer consumer = new JpaConsumer(this, processor); |
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configureConsumer(consumer); |
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return consumer; |
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} |
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@Override |
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public void configureProperties(Map options) { |
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super.configureProperties(options); |
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Map emProperties = IntrospectionSupport.extractProperties(options, "emf."); |
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if (emProperties != null) { |
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setEntityManagerProperties(emProperties); |
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} |
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} |
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public boolean isSingleton() { |
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return false; |
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} |
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public JpaTemplate getTemplate() { |
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if (template == null) { |
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template = createTemplate(); |
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} |
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return template; |
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} |
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public void setTemplate(JpaTemplate template) { |
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this.template = template; |
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} |
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public Expression<Exchange> getProducerExpression() { |
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if (producerExpression == null) { |
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producerExpression = createProducerExpression(); |
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} |
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return producerExpression; |
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} |
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public void setProducerExpression(Expression<Exchange> producerExpression) { |
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this.producerExpression = producerExpression; |
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} |
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public int getMaximumResults() { |
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return maximumResults; |
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} |
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public void setMaximumResults(int maximumResults) { |
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this.maximumResults = maximumResults; |
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} |
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public Class<?> getEntityType() { |
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return entityType; |
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} |
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public void setEntityType(Class<?> entityType) { |
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this.entityType = entityType; |
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} |
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public EntityManagerFactory getEntityManagerFactory() { |
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if (entityManagerFactory == null) { |
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entityManagerFactory = createEntityManagerFactory(); |
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} |
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return entityManagerFactory; |
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} |
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public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) { |
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this.entityManagerFactory = entityManagerFactory; |
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} |
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public Map getEntityManagerProperties() { |
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if (entityManagerProperties == null) { |
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entityManagerProperties = System.getProperties(); |
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} |
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return entityManagerProperties; |
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} |
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public void setEntityManagerProperties(Map entityManagerProperties) { |
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this.entityManagerProperties = entityManagerProperties; |
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} |
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public String getPersistenceUnit() { |
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return persistenceUnit; |
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} |
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public void setPersistenceUnit(String persistenceUnit) { |
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this.persistenceUnit = persistenceUnit; |
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} |
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protected JpaTemplate createTemplate() { |
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return new JpaTemplate(getEntityManagerFactory()); |
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} |
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protected EntityManagerFactory createEntityManagerFactory() { |
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return Persistence.createEntityManagerFactory(persistenceUnit, getEntityManagerProperties()); |
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} |
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protected EntityManager createEntityManager() { |
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return getEntityManagerFactory().createEntityManager(); |
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} |
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protected TransactionStrategy createTransactionStrategy() { |
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EntityManagerFactory emf = getEntityManagerFactory(); |
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return JpaTemplateTransactionStrategy.newInstance(emf, getTemplate()); |
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} |
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protected Expression<Exchange> createProducerExpression() { |
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final Class<?> type = getEntityType(); |
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if (type == null) { |
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return ExpressionBuilder.bodyExpression(); |
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} |
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else { |
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return new Expression<Exchange>() { |
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public Object evaluate(Exchange exchange) { |
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Object answer = exchange.getIn().getBody(type); |
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if (answer == null) { |
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Object defaultValue = exchange.getIn().getBody(); |
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if (defaultValue != null) { |
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throw new NoTypeConversionAvailableException(defaultValue, type); |
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} |
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answer = exchange.getContext().getInjector().newInstance(type); |
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} |
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return answer; |
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} |
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}; |
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} |
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} |
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} |