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/*******************************************************************************
* Copyright 2017 ZTE, Inc. and others.
*
* 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.onap.msb.sdk.httpclient.lb;
import java.util.concurrent.atomic.AtomicLong;
import org.onap.msb.sdk.httpclient.ServiceHttpEndPointObject;
import org.onap.msb.sdk.httpclient.exception.RetrofitServiceRuntimeException;
/**
* @author hu.rui
*
*/
public class RoundRobinLBStrategy implements ILoadBalanceStrategy {
private AtomicLong invokeCount = new AtomicLong(0);
/*
* (non-Javadoc)
*
* @see
* com.zte.ums.zenap.httpclient.retrofit.lb.ILoadBalanceStrategy#chooseEndPointObject(com.zte.ums.
* zenap.httpclient.retrofit.lb.LoadBalanceContext)
*/
@Override
public ServiceHttpEndPointObject chooseEndPointObject(LoadBalanceContext lbCtx) {
long invokecount = invokeCount.getAndIncrement();
if (lbCtx.getEndPoints().size() == 0) {
throw new RetrofitServiceRuntimeException("target endPoints is empty");
}
int mod = (int) (invokecount % lbCtx.getEndPoints().size());
return lbCtx.getEndPoints().get(mod);
}
}
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