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/*
* 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.tuscany.sca.demos.loadbalancer.rule;
import javax.servlet.http.HttpServletRequest;
import org.apache.webapp.balancer.rules.BaseRule;
public class RoundRobinRule extends BaseRule {
/**
* The number of worker nodes that load will
* be balanced across
*/
private int workerCount;
private int currentCount = 1;
/**
* Sets the worker count.
*
* @param workerCount The worker count
*/
public void setWorkerCount(int workerCount) {
if (workerCount == 0) {
throw new IllegalArgumentException(
"worker count cannot be 0.");
} else {
this.workerCount = workerCount;
}
}
/**
* Returns the worker count.
*
* @return int The worker count
*/
protected int getWorkerCount() {
return workerCount;
}
/**
* @see org.apache.webapp.balancer.Rule#matches(HttpServletRequest)
*/
public boolean matches(HttpServletRequest request) {
if (currentCount == workerCount){
currentCount = 1;
return true;
} else {
currentCount++;
return false;
}
}
/**
* Returns a String representation of this object.
*
* @return String
*/
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("[");
buffer.append(getClass().getName());
buffer.append(": ");
buffer.append("Worker count: ");
buffer.append(getWorkerCount());
buffer.append(" / ");
buffer.append("Redirect URL: ");
buffer.append(getRedirectUrl());
buffer.append("]");
return buffer.toString();
}
}
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