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package org.apache.camel.bam; |
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import java.util.ArrayList; |
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import java.util.List; |
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import org.apache.camel.Endpoint; |
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import org.apache.camel.Processor; |
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import org.apache.camel.Route; |
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import org.apache.camel.bam.model.ActivityDefinition; |
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import org.apache.camel.bam.model.ProcessDefinition; |
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import org.apache.camel.bam.model.ProcessInstance; |
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import org.apache.camel.bam.processor.ActivityMonitorEngine; |
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import org.apache.camel.bam.processor.JpaBamProcessor; |
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import org.apache.camel.bam.rules.ProcessRules; |
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import org.apache.camel.builder.RouteBuilder; |
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import org.springframework.orm.jpa.JpaTemplate; |
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import org.springframework.transaction.TransactionStatus; |
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import org.springframework.transaction.support.TransactionCallbackWithoutResult; |
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import org.springframework.transaction.support.TransactionTemplate; |
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import static org.apache.camel.util.ObjectHelper.notNull; |
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public abstract class ProcessBuilder extends RouteBuilder { |
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private static int processCounter; |
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private JpaTemplate jpaTemplate; |
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private final TransactionTemplate transactionTemplate; |
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private final String processName; |
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private List<ActivityBuilder> activityBuilders = new ArrayList<ActivityBuilder>(); |
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private Class entityType = ProcessInstance.class; |
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private ProcessRules processRules = new ProcessRules(); |
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private ProcessDefinition processDefinition; |
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protected ProcessBuilder(JpaTemplate jpaTemplate, TransactionTemplate transactionTemplate) { |
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this(jpaTemplate, transactionTemplate, createProcessName()); |
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} |
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protected ProcessBuilder(JpaTemplate jpaTemplate, TransactionTemplate transactionTemplate, String processName) { |
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this.jpaTemplate = jpaTemplate; |
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this.transactionTemplate = transactionTemplate; |
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this.processName = processName; |
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} |
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protected static synchronized String createProcessName() { |
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return "Process-" + (++processCounter); |
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} |
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public ActivityBuilder activity(String endpointUri) { |
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return activity(endpoint(endpointUri)); |
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} |
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public ActivityBuilder activity(Endpoint endpoint) { |
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ActivityBuilder answer = new ActivityBuilder(this, endpoint); |
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activityBuilders.add(answer); |
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return answer; |
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} |
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public ProcessBuilder entityType(Class entityType) { |
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this.entityType = entityType; |
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return this; |
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} |
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public Processor createActivityProcessor(ActivityBuilder activityBuilder) { |
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notNull(jpaTemplate, "jpaTemplate"); |
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transactionTemplate.execute(new TransactionCallbackWithoutResult() { |
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protected void doInTransactionWithoutResult(TransactionStatus status) { |
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processRules.setProcessDefinition(getProcessDefinition()); |
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} |
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}); |
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return new JpaBamProcessor(getTransactionTemplate(), getJpaTemplate(), activityBuilder.getCorrelationExpression(), activityBuilder.getActivityRules(), getEntityType()); |
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} |
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public List<ActivityBuilder> getActivityBuilders() { |
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return activityBuilders; |
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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 JpaTemplate getJpaTemplate() { |
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return jpaTemplate; |
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} |
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public void setJpaTemplate(JpaTemplate jpaTemplate) { |
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this.jpaTemplate = jpaTemplate; |
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} |
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public TransactionTemplate getTransactionTemplate() { |
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return transactionTemplate; |
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} |
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public ProcessRules getProcessRules() { |
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return processRules; |
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} |
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public String getProcessName() { |
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return processName; |
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} |
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public ProcessDefinition getProcessDefinition() { |
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if (processDefinition == null) { |
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processDefinition = findOrCreateProcessDefinition(); |
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} |
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return processDefinition; |
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} |
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public void setProcessDefinition(ProcessDefinition processDefinition) { |
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this.processDefinition = processDefinition; |
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} |
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protected void populateRoutes(List<Route> routes) throws Exception { |
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boolean first = true; |
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for (ActivityBuilder builder : activityBuilders) { |
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Route route = builder.createRoute(); |
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if (first) { |
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route.getServices().add(new ActivityMonitorEngine(getJpaTemplate(), getTransactionTemplate(), getProcessRules())); |
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first = false; |
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} |
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routes.add(route); |
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} |
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} |
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public ActivityDefinition findOrCreateActivityDefinition(String activityName) { |
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ProcessDefinition definition = getProcessDefinition(); |
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List<ActivityDefinition> list = jpaTemplate.find("select x from " + ActivityDefinition.class.getName() + " x where x.processDefinition = ?1 and x.name = ?2", definition, activityName); |
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if (!list.isEmpty()) { |
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return list.get(0); |
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} else { |
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ActivityDefinition answer = new ActivityDefinition(); |
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answer.setName(activityName); |
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answer.setProcessDefinition(ProcessDefinition.getRefreshedProcessDefinition(jpaTemplate, definition)); |
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jpaTemplate.persist(answer); |
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return answer; |
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} |
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} |
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protected ProcessDefinition findOrCreateProcessDefinition() { |
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List<ProcessDefinition> list = jpaTemplate.find("select x from " + ProcessDefinition.class.getName() + " x where x.name = ?1", processName); |
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if (!list.isEmpty()) { |
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return list.get(0); |
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} else { |
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ProcessDefinition answer = new ProcessDefinition(); |
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answer.setName(processName); |
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jpaTemplate.persist(answer); |
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return answer; |
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} |
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} |
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} |