INT-3035 Fix ExponentialMovingAverageRate 'window'

'window' constructor arg was not used.

Add test.

spring-integration-jmx/src/main/java/org/springframework/integration/monitor/ExponentialMovingAverageRate.java

@@ -1,11 +1,11 @@
 /*
- * Copyright 2009-2010 the original author or authors.
- * 
+ * Copyright 2009-2013 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.
@@ -25,9 +25,10 @@ package org.springframework.integration.monitor;
  * <li>per measurement according to the lapse window supplied: <code>weight = exp(-i/L)</code> where <code>L</code> is
  * the lapse window and <code>i</code> is the sequence number of the measurement.</li>
  * </ul>
- * 
+ *
  * @author Dave Syer
- * 
+ * @author Gary Russell
+ *
  */
 public class ExponentialMovingAverageRate {
 
@@ -54,7 +55,7 @@ public class ExponentialMovingAverageRate {
 	 * @param window the exponential lapse window (number of measurements)
 	 */
 	public ExponentialMovingAverageRate(double period, double lapsePeriod, int window) {
-		rates = new ExponentialMovingAverage(10);
+		rates = new ExponentialMovingAverage(window);
 		this.lapse = lapsePeriod > 0 ? 0.001 / lapsePeriod : 0; // convert to milliseconds
 		this.period = period * 1000; // convert to milliseconds
 	}