/**
* Copyright 2013 Netflix, Inc.
*
* 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 com.netflix.evcache.pool.eureka;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import net.spy.memcached.MemcachedClient;
import com.netflix.config.DynamicIntProperty;
import com.netflix.evcache.pool.AbstractEVCacheClientImpl;
import com.netflix.evcache.pool.eureka.connection.EVCacheConnectionFactory;
import com.netflix.evcache.pool.observer.EVCacheConnectionObserver;
/**
* An implementation of {@link com.netflix.evcache.pool.EVCacheClient} based on Eureka.
* @author smadappa
*
*/
public class EVCacheClientImpl extends AbstractEVCacheClientImpl {
private EVCacheConnectionObserver connectionObserver = null;
/**
* Creates an instances of {@link com.netflix.evcache.pool.EVCacheClient} for the given appName, zone, id,
* readTimeout and the list of memcached nodes. An instance of connection factory ({@link EVCacheConnectionFactory})
* with the given maxQueueSize and appName. Additionally a connection observer ({@link EVCacheConnectionObserver})
* for the given appName, zone and id is also created which monitors
* the connection between client and the memcached server.
*
* @param appName - The name of the EVCache app.
* @param zone - The zone this client belongs to.
* @param id - The id of this client.
* @param maxQueueSize - Max number of items allowed in the queue
* @param readTimeout - The timeout for all read operations
* @param memcachedNodesInZone - The memcached nodes that are part of this client.
* @throws IOException - The exception while trying to establish the connection with the hosts.
* Typically this can happen if the Security Groups are configured properly, the hosts don't exists.
*/
EVCacheClientImpl(String appName, String zone, int id, int maxQueueSize, DynamicIntProperty readTimeout,
List<InetSocketAddress> memcachedNodesInZone) throws IOException {
super(appName, zone, id, readTimeout, new EVCacheConnectionFactory(appName, zone, id, maxQueueSize));
this.client = new MemcachedClient(connectionFactory, memcachedNodesInZone);
this.connectionObserver = new EVCacheConnectionObserver(appName, zone, id);
this.client.addObserver(connectionObserver);
}
/**
* {@inheritDoc}
*/
public boolean removeConnectionObserver() {
try {
boolean removed = client.removeObserver(connectionObserver);
if (removed) connectionObserver = null;
return removed;
} catch (Exception e) {
return false;
}
}
/**
* {@inheritDoc}
*/
public EVCacheConnectionObserver getConnectionObserver() {
return this.connectionObserver;
}
/**
* String representation of this innstance.
*/
public String toString() {
return "EVCacheClientImpl [" + super.toString() + "]";
}
}