io.seldon.servlet.ResourceManagerListener.java Source code

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Here is the source code for io.seldon.servlet.ResourceManagerListener.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.servlet;

import io.seldon.api.Constants;
import io.seldon.api.state.ZkAlgorithmUpdaterFactory;
import io.seldon.api.state.ZkCuratorHandler;
import io.seldon.api.state.zk.ZkClientConfigHandler;
import io.seldon.api.statsd.StatsdPeer;
import io.seldon.db.jdo.JDOFactory;
import io.seldon.memcache.MemCachePeer;
import io.seldon.memcache.SecurityHashPeer;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.log4j.Logger;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class ResourceManagerListener implements ServletContextListener {

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

    private ZkClientConfigHandler zkClientConfigHandler;

    public void contextInitialized(ServletContextEvent sce) {
        logger.info("**********************  STARTING API-SERVER INITIALISATION **********************");
        JDOFactory jdoFactory = null;
        try {
            final WebApplicationContext springContext = WebApplicationContextUtils
                    .getWebApplicationContext(sce.getServletContext());
            jdoFactory = (JDOFactory) springContext.getBean("JDOFactory");

            zkClientConfigHandler = (ZkClientConfigHandler) springContext.getBean("zkClientConfigHandler");
            //InputStream propStream = sce.getServletContext().getResourceAsStream("/WEB-INF/labs.properties");
            InputStream propStream = getClass().getClassLoader().getResourceAsStream("/labs.properties");
            SecurityHashPeer.initialise();
            Properties props = new Properties();
            props.load(propStream);

            // Set the default client name from properties if it exists
            String defClientName = props.getProperty("io.seldon.labs.default.client");
            if (defClientName != null && defClientName.length() > 0) {
                Constants.DEFAULT_CLIENT = defClientName;
            }

            MemCachePeer.initialise(props);

            StatsdPeer.initialise(props);

            ZkCuratorHandler curatorHandler = ZkCuratorHandler.getPeer();
            if (curatorHandler != null) {
                ZkAlgorithmUpdaterFactory.initialise(props, curatorHandler);
            }

            zkClientConfigHandler.contextIntialised();
            logger.info("**********************  ENDING API-SERVER INITIALISATION **********************");
        } catch (IOException ex) {
            logger.error("IO Exception", ex);
        } catch (Exception ex) {
            logger.error("Exception at resource initialization", ex);
        } catch (Throwable e) {
            logger.error("Throwable during initialization ", e);
        } finally {
            if (jdoFactory != null)
                jdoFactory.cleanupPM();
        }
    }

    public void contextDestroyed(ServletContextEvent sce) {
        if (MemCachePeer.getClient() != null) {
            MemCachePeer.getClient().shutdown();
        }
        try {
            ZkAlgorithmUpdaterFactory.destroy();
        } catch (InterruptedException e) {

        }
        ZkCuratorHandler.shutdown();
    }

}