Github user PuspenduBanerjee commented on a diff in the pull request: https://github.com/apache/nifi/pull/186#discussion_r51090275 --- Diff: nifi-nar-bundles/nifi-camel-bundle/nifi-camel-processors/src/main/java/org/apache/nifi/processors/camel/CamelProcessor.java --- @@ -0,0 +1,240 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.nifi.processors.camel; + +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableSet; +import groovy.lang.GroovyClassLoader; + +import java.util.List; +import java.util.Set; +import java.util.concurrent.TimeUnit; + +import org.apache.camel.CamelContext; +import org.apache.camel.Exchange; +import org.apache.camel.ProducerTemplate; +import org.apache.camel.ServiceStatus; +import org.apache.camel.impl.DefaultExchange; +import org.apache.camel.impl.DefaultShutdownStrategy; +import org.apache.camel.spi.ShutdownStrategy; +import org.apache.camel.spring.SpringCamelContext; +import org.apache.commons.lang3.StringUtils; +import org.apache.commons.lang3.math.NumberUtils; +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.annotation.lifecycle.OnStopped; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.ValidationContext; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.components.Validator; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.processor.AbstractProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.springframework.context.ApplicationContext; +import org.springframework.context.support.AbstractApplicationContext; +import org.springframework.context.support.ClassPathXmlApplicationContext; +import org.springframework.context.support.FileSystemXmlApplicationContext; +import org.springframework.context.support.GenericXmlApplicationContext; +import org.springframework.core.io.ByteArrayResource; + +/** + * This processor runs a Camel Route. + */ +@Tags({"camel", "route", "put"}) +@InputRequirement(Requirement.INPUT_ALLOWED) +@CapabilityDescription("Runs a Camel Route. Each input FlowFile is converted into a Camel Exchange " + + "for processing by configured Route. It exports ProcessSession to camel exchange header 'nifiSession'") +public class CamelProcessor extends AbstractProcessor { + + protected static final Relationship SUCCESS = new Relationship.Builder().name("success") + .description("Camel Route has Executed Successfully").build(); + + protected static final Relationship FAILURE = new Relationship.Builder().name("failure") + .description("Camel Route has Failed to Execute").build(); + + public static final PropertyDescriptor CAMEL_SPRING_CONTEXT_FILE_PATH = new PropertyDescriptor.Builder() + .name("Camel Spring Config File Path") + .description("The Classpath where NiFi can find Spring Application context file" + + " Ex: classpath:/META-INF/camel-application-context.xml") + .defaultValue("classpath:/META-INF/camel-application-context.xml").required(true).addValidator(Validator.VALID) + .build(); + + public static final PropertyDescriptor CAMEL_SPRING_CONTEXT_DEF = new PropertyDescriptor.Builder() + .name("Camel Spring Context Definition") + .description("Content of Spring Application context ") + .defaultValue("").addValidator(Validator.VALID) + .build(); + + public static final PropertyDescriptor CAMEL_ENTRY_POINT_URI = new PropertyDescriptor.Builder() + .name("Camel EntryPoint") + .description("EntryPoint for NiFi in Camel Route" + " Ex: direct-vm:nifiEntryPoint") + .defaultValue("direct-vm:nifiEntryPoint").required(true).addValidator(Validator.VALID).build(); + + /** + *@see <a href="http://camel.apache.org/grape.html"> Camel Grape Documentation</a> + */ + public static final PropertyDescriptor EXT_LIBRARIES = new PropertyDescriptor.Builder() + .name("Extra Libraries") + .description("Comma Seperated List of Extra Libraries/Features to Download and Use [ in GroupId/ArtifactId/version format]. " + + "Ex: org.apache.camel/camel-mail/2.16.1,\n" + + "org.apache.camel/camel-infinispan/2.16.1") + .required(false).addValidator(new GrapeGrabValidator()).build(); + + private static SpringCamelContext camelContext = null; + + private ImmutableList<PropertyDescriptor> descriptors; + + private ImmutableSet<Relationship> relationships=ImmutableSet.of(SUCCESS, FAILURE); + + public static synchronized SpringCamelContext getCamelContext() { + return camelContext; + } + + @Override + public Set<Relationship> getRelationships() { + return relationships; + } + + @Override + public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException { + FlowFile flowFile = session.get(); + if (flowFile == null) { + return; + } + CamelContext camelContext=getCamelContext(); + Exchange exchange = new DefaultExchange(camelContext); + exchange.getIn().setBody(flowFile); + exchange.getIn().setHeader("nifiSession", session); + ProducerTemplate producerTemplate= camelContext.createProducerTemplate(); + producerTemplate.setDefaultEndpointUri(context.getProperty(CAMEL_ENTRY_POINT_URI) + .getValue()); + exchange = producerTemplate.send(exchange); + try{ + producerTemplate.stop(); + }catch(Exception e){ + throw new ProcessException(e); + } + if (exchange != null && !(exchange.isFailed())) { + session.transfer(exchange.getIn().getBody(FlowFile.class), SUCCESS); + } else { + if (exchange.isFailed() && exchange.getException() != null) { + session.putAttribute(flowFile, "camelRouteException", exchange.getException().getMessage()); + } + session.transfer(flowFile, FAILURE); + } + } + + @Override + protected void init(final ProcessorInitializationContext context) { + this.descriptors = ImmutableList.of(CAMEL_SPRING_CONTEXT_FILE_PATH, CAMEL_SPRING_CONTEXT_DEF, + CAMEL_ENTRY_POINT_URI,EXT_LIBRARIES); + } + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return descriptors; + } + + @OnScheduled + public void onScheduled(final ProcessContext context) { + if (getCamelContext() == null + || getCamelContext().getStatus()==ServiceStatus.Stopped + || getCamelContext().getStatus()==ServiceStatus.Stopping) { + try { + String camelContextDef=context + .getProperty(CAMEL_SPRING_CONTEXT_DEF).getValue(); + String camelContextPath=context + .getProperty(CAMEL_SPRING_CONTEXT_FILE_PATH).getValue(); + ApplicationContext applicationContext; + if(camelContextDef!=null && camelContextDef.trim().length()>0){ + applicationContext= new GenericXmlApplicationContext(new ByteArrayResource(camelContextDef.getBytes(),"InMemory Camel COntext Definition")); + }else{ + if(camelContextPath.startsWith("classpath:")){ + applicationContext=new ClassPathXmlApplicationContext(camelContextPath.split(":")[1]); + }else{ + applicationContext=new FileSystemXmlApplicationContext(camelContextPath.split(":")[1]); + } + } + camelContext = new SpringCamelContext(applicationContext); + camelContext.setApplicationContextClassLoader(new GroovyClassLoader(camelContext.getApplicationContextClassLoader())); + camelContext.addStartupListener(new CamelContextStartupListener(getLogger())); + ShutdownStrategy shutdownStrategy=new DefaultShutdownStrategy(); + shutdownStrategy.setTimeout(1); + shutdownStrategy.setTimeUnit(TimeUnit.SECONDS); + camelContext.setShutdownStrategy(shutdownStrategy); + camelContext.start(); + getLogger().info("Camel Spring Context initialized"); + } catch (Exception exception) { + getLogger().error("Failed to Shutdown Camel Spring Context", exception); --- End diff -- incorporated your comment. Thanks a lot for reviewing.
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