/**
* Copyright (C) 2014 Couchbase, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
* IN THE SOFTWARE.
*/
package com.couchbase.client.core.service.strategies;
import com.couchbase.client.core.endpoint.Endpoint;
import com.couchbase.client.core.message.CouchbaseRequest;
import com.couchbase.client.core.state.LifecycleState;
import java.util.Random;
/**
* Selects the {@link Endpoint} based on a random selection of connected {@link Endpoint}s.
*
* @author Michael Nitschinger
* @since 1.0
*/
public class RandomSelectionStrategy implements SelectionStrategy {
/**
* Random number generator, statically initialized and designed to be reused.
*/
private static final Random RANDOM = new Random();
/**
* The number of times to try to find a suitable endpoint before returning without success.
*/
private static final int MAX_TRIES = 100;
@Override
public Endpoint select(final CouchbaseRequest request, final Endpoint[] endpoints) {
int numEndpoints = endpoints.length;
if (numEndpoints == 0) {
return null;
}
for (int i = 0; i < MAX_TRIES; i++) {
int rand = RANDOM.nextInt(endpoints.length);
Endpoint endpoint = endpoints[rand];
if (endpoint.isState(LifecycleState.CONNECTED)) {
return endpoint;
}
}
return null;
}
}