INTSAMPLES-39 Dynamic FTP Router
Demonstrates the use of Spring 3.1 to instantiate multiple application contexts, each with a differently configured ftp outbound adapter, together with a POJO Channel resolver used to send messages to the appropriate context.
This commit is contained in:
Gary Russell
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/*
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* Copyright 2002-2011 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.samples.ftp;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Properties;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import org.springframework.core.env.PropertiesPropertySource;
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import org.springframework.core.env.StandardEnvironment;
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import org.springframework.integration.MessageChannel;
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/**
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* Demonstrates how a dynamic Spring Integration flow snippet can be used
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* to send files to dynamic destinations.
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*
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* @author Gary Russell
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* @since 2.1
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*
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*/
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public class DynamicFtpChannelResolver {
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private final Map<String, MessageChannel> channels = new HashMap<String, MessageChannel>();
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/**
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* Resolve a customer to a channel, where each customer gets a private
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* application context and the channel is the inbound channel to that
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* application context.
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*
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* @param customer
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* @return a channel
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*/
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public MessageChannel resolve(String customer) {
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MessageChannel channel = this.channels.get(customer);
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if (channel == null) {
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ConfigurableApplicationContext ctx = new ClassPathXmlApplicationContext(
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new String[] { "/META-INF/spring/integration/dynamic-ftp-outbound-adapter-context.xml" },
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false);
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this.setEnvironmentForCustomer(ctx, customer);
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ctx.refresh();
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channel = ctx.getBean("toFtpChannel", MessageChannel.class);
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this.channels.put(customer, channel);
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}
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return channel;
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}
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/**
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* Use Spring 3.1. environment support to set properties for the
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* customer-specific application context.
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*
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* @param ctx
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* @param customer
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*/
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private void setEnvironmentForCustomer(ConfigurableApplicationContext ctx,
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String customer) {
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StandardEnvironment env = new StandardEnvironment();
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Properties props = new Properties();
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// populate properties for customer
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props.setProperty("host", "host.for." + customer);
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props.setProperty("user", "user");
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props.setProperty("password", "password");
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props.setProperty("remote.directory", "/tmp");
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PropertiesPropertySource pps = new PropertiesPropertySource("ftpprops", props);
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env.getPropertySources().addLast(pps);
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ctx.setEnvironment(env);
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:int="http://www.springframework.org/schema/integration"
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xmlns:int-ftp="http://www.springframework.org/schema/integration/ftp"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
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http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.1.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
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http://www.springframework.org/schema/integration/ftp http://www.springframework.org/schema/integration/ftp/spring-integration-ftp-2.1.xsd">
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<context:property-placeholder />
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<bean id="ftpClientFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory">
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<property name="host" value="${host}"/>
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<property name="username" value="${user}"/>
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<property name="password" value="${password}"/>
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</bean>
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<int:channel id="toFtpChannel"/>
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<int-ftp:outbound-channel-adapter id="ftpOutbound"
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channel="toFtpChannel"
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remote-directory="${remote.directory}"
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session-factory="ftpClientFactory"/>
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</beans>
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/*
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* Copyright 2002-2011 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.samples.ftp;
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import static org.junit.Assert.*;
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import org.junit.Test;
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import org.springframework.integration.MessageChannel;
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/**
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* @author Gary Russell
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* @since 2.1
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*
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*/
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public class DynamicFtpChannelResolverTests {
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/**
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* Test method for {@link org.springframework.integration.samples.ftp.DynamicFtpChannelResolver#resolve(java.lang.String)}.
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*/
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@Test
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public void testResolve() {
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DynamicFtpChannelResolver dynamicFtpChannelResolver = new DynamicFtpChannelResolver();
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MessageChannel channel1 = dynamicFtpChannelResolver.resolve("customer1");
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assertNotNull(channel1);
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MessageChannel channel2 = dynamicFtpChannelResolver.resolve("customer2");
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assertNotNull(channel2);
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assertNotSame(channel1, channel2);
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MessageChannel channel1a = dynamicFtpChannelResolver.resolve("customer1");
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assertSame(channel1, channel1a);
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}
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}
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/*
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* Copyright 2002-2010 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.samples.ftp;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import java.io.File;
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import java.net.UnknownHostException;
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import org.junit.Test;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.support.ClassPathXmlApplicationContext;
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import org.springframework.integration.Message;
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import org.springframework.integration.MessageChannel;
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import org.springframework.integration.MessageHandlingException;
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import org.springframework.integration.support.MessageBuilder;
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/**
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* @author Gary Russell
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*
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*/
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public class FtpOutboundChannelAdapterSample {
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@Test
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public void runDemo() throws Exception{
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ApplicationContext ctx =
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new ClassPathXmlApplicationContext("META-INF/spring/integration/DynamicFtpOutboundChannelAdapterSample-context.xml");
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MessageChannel channel = ctx.getBean("toDynRouter", MessageChannel.class);
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File file = File.createTempFile("temp", "txt");
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Message<File> message = MessageBuilder.withPayload(file)
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.setHeader("customer", "cust1")
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.build();
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try {
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channel.send(message);
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} catch (MessageHandlingException e) {
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assertTrue(e.getCause().getCause() instanceof UnknownHostException);
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assertEquals("host.for.cust1", e.getCause().getCause().getMessage());
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}
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// send another so we can see in the log we don't create the ac again.
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try {
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channel.send(message);
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} catch (MessageHandlingException e) {
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assertTrue(e.getCause().getCause() instanceof UnknownHostException);
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assertEquals("host.for.cust1", e.getCause().getCause().getMessage());
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}
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// send to a different customer; again, check the log to see a new ac is built
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message = MessageBuilder.withPayload(file)
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.setHeader("customer", "cust2").build();
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try {
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channel.send(message);
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} catch (MessageHandlingException e) {
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assertTrue(e.getCause().getCause() instanceof UnknownHostException);
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assertEquals("host.for.cust2", e.getCause().getCause().getMessage());
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}
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:int="http://www.springframework.org/schema/integration"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.1.xsd
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http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
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<bean id="channelResolver" class="org.springframework.integration.samples.ftp.DynamicFtpChannelResolver" />
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<int:channel id="toDynRouter" />
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<int:router input-channel="toDynRouter"
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expression="@channelResolver.resolve(headers['customer'])"/>
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</beans>
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8
advanced/dynamic-ftp/src/test/resources/log4j.properties
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8
advanced/dynamic-ftp/src/test/resources/log4j.properties
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log4j.rootCategory=WARN, stdout
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log4j.appender.stdout=org.apache.log4j.ConsoleAppender
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log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
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log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n
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log4j.category.org.springframework=WARN
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log4j.category.org.springframework.integration=DEBUG
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