From dcd0a42290eea408a920fc76d2be7cf68d92c920 Mon Sep 17 00:00:00 2001
From: Artem Bilan <clericsmail@gmail.com>
Date: Wed, 13 Jun 2012 00:10:39 +0300
Subject: [PATCH] How to implement Scatter-Gather

---
 .../ScatterGatherTests-context.xml            | 54 ++++++++++++++++
 .../scattergather/ScatterGatherTests.java     | 61 +++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests-context.xml
 create mode 100644 spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests.java

diff --git a/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests-context.xml b/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests-context.xml
new file mode 100644
index 00000000000..c67731d2688
--- /dev/null
+++ b/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests-context.xml
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans:beans xmlns:beans="http://www.springframework.org/schema/beans"
+			 xmlns="http://www.springframework.org/schema/integration"
+			 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+			 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+             http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd">
+
+	<channel id="output">
+		<queue/>
+	</channel>
+
+
+	<aggregator input-channel="gatherChannel" output-channel="output"
+				release-strategy-expression="size() == 2"
+				expression="^[payload gt 5] ?: -1"/>
+
+
+	<!--Auction scenario-->
+	<header-enricher input-channel="inputAuctionChannel" output-channel="scatterAuctionChannel">
+		<reply-channel ref="gatherChannel"/>
+	</header-enricher>
+
+	<publish-subscribe-channel id="scatterAuctionChannel" apply-sequence="true"/>
+
+	<bridge input-channel="scatterAuctionChannel" output-channel="serviceChannel"/>
+
+	<bridge input-channel="scatterAuctionChannel" output-channel="serviceChannel"/>
+
+	<bridge input-channel="scatterAuctionChannel" output-channel="serviceChannel"/>
+
+
+	<!--Distribution scenario-->
+	<header-enricher input-channel="inputDistributionChannel" output-channel="scatterDistributionChannel">
+		<reply-channel ref="gatherChannel"/>
+	</header-enricher>
+
+	<recipient-list-router input-channel="scatterDistributionChannel" apply-sequence="true">
+		<recipient channel="distribution1Channel"/>
+		<recipient channel="distribution2Channel"/>
+		<recipient channel="distribution3Channel"/>
+	</recipient-list-router>
+
+	<bridge input-channel="distribution1Channel" output-channel="serviceChannel"/>
+
+	<bridge input-channel="distribution2Channel" output-channel="serviceChannel"/>
+
+	<bridge input-channel="distribution3Channel" output-channel="serviceChannel"/>
+
+
+
+	<service-activator input-channel="serviceChannel" expression="T(java.lang.Math).random() * 10"/>
+
+
+</beans:beans>
diff --git a/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests.java b/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests.java
new file mode 100644
index 00000000000..80ab8d2b1dd
--- /dev/null
+++ b/spring-integration-core/src/test/java/org/springframework/integration/scattergather/ScatterGatherTests.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2002-2012 the original author or authors.
+ *
+ * Licensed 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.springframework.integration.scattergather;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.integration.Message;
+import org.springframework.integration.MessageChannel;
+import org.springframework.integration.core.PollableChannel;
+import org.springframework.integration.support.MessageBuilder;
+import org.springframework.test.annotation.Repeat;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * @author Artem Bilan
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration
+public class ScatterGatherTests {
+
+	@Autowired
+	private MessageChannel inputAuctionChannel;
+
+	@Autowired
+	private MessageChannel inputDistributionChannel;
+
+	@Autowired
+	private PollableChannel output;
+
+	@Test
+	@Repeat(10)
+	public void testAuction() throws Exception {
+		Message<String> quoteMessage = MessageBuilder.withPayload("testQuote").build();
+		inputAuctionChannel.send(quoteMessage);
+		Message<?> bestQuoteMessage = output.receive();
+		System.out.println(bestQuoteMessage);
+	}
+
+	@Test
+	@Repeat(10)
+	public void testDistribution() throws Exception {
+		Message<String> quoteMessage = MessageBuilder.withPayload("testQuote").build();
+		inputDistributionChannel.send(quoteMessage);
+		Message<?> bestQuoteMessage = output.receive();
+		System.out.println(bestQuoteMessage);
+	}
+
+}