io.seldon.memcache.ExceptionSwallowingMemcachedClient.java Source code

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Here is the source code for io.seldon.memcache.ExceptionSwallowingMemcachedClient.java

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/*
 * Seldon -- open source prediction engine
 * =======================================
 *
 * Copyright 2011-2015 Seldon Technologies Ltd and Rummble Ltd (http://www.seldon.io/)
 *
 * ********************************************************************************************
 *
 * 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 io.seldon.memcache;

import net.spy.memcached.AddrUtil;
import net.spy.memcached.ConnectionFactoryBuilder;
import net.spy.memcached.DefaultConnectionFactory;
import net.spy.memcached.MemcachedClient;
import net.spy.memcached.internal.OperationFuture;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * @author firemanphil
 *         Date: 18/11/14
 *         Time: 14:06
 */
@Component
public class ExceptionSwallowingMemcachedClient extends MemcachedClient {

    private static Logger logger = Logger.getLogger(ExceptionSwallowingMemcachedClient.class.getName());

    @Autowired
    public ExceptionSwallowingMemcachedClient(@Value("${io.seldon.memcached.servers}") String servers)
            throws IOException {
        super(new ConnectionFactoryBuilder(new DefaultConnectionFactory()).setOpTimeout(1000).build(),
                AddrUtil.getAddresses(servers));
    }

    /*
    *  Expire in seconds
    */
    @Override
    public OperationFuture<Boolean> set(String key, int expireSeconds, Object obj) {
        try {
            return super.set(hashKey(key), expireSeconds, obj);
        } catch (Exception ex) {
            logger.warn("Memcache put expire exeption ", ex);
            return null;
        }
    }

    @Override
    public Object get(String key) {
        Object myObj = null;
        Future<Object> f = super.asyncGet(hashKey(key));
        try {
            myObj = f.get(500, TimeUnit.MILLISECONDS);
        } catch (TimeoutException e) {
            logger.warn("Timeout exception in get ", e);
            f.cancel(false);
        } catch (InterruptedException e) {
            logger.error("Interrupted in get ", e);
            f.cancel(false);
        } catch (ExecutionException e) {
            logger.error("Execution exception in get ", e);
            f.cancel(false);
        }
        return myObj;
    }

    private static String hashKey(String key) {
        return SecurityHashPeer.md5digest(key);
    }
}