com.rockagen.gnext.service.spring.KeyValueMapImpl.java Source code

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Here is the source code for com.rockagen.gnext.service.spring.KeyValueMapImpl.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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.rockagen.gnext.service.spring;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.rockagen.commons.util.CommUtil;
import com.rockagen.gnext.po.KeyValue;
import com.rockagen.gnext.service.KeyValueServ;
import com.rockagen.gnext.tool.Conf;

/**
 * Replace Properties configuration
 * <p>
 * <b>NOTE: Manager by Spring &lt;task:scheduled-tasks&gt;<b>
 * </p>
 * 
 * <p>
 * example:
 * </p>
 * 
 * <pre>
 * &lt;bean id="keyValueMap" class="com.rockagen.gnext.service.spring.KeyValueMap" init-method="init"&gt;
 *    &lt;property name="keyValueServ" ref="keyValueServ"/&gt;
 * &lt;/bean&gt;
 *   
 * &lt;!-- KEY VALUE MAP TASK --&gt;
 * &lt;task:scheduled-tasks&gt;  
 *    &lt;task:scheduled ref="keyValueMap" method="update" cron="0 *<code>/</code>5 9-21 * * ?"/&gt;  
 * &lt;/task:scheduled-tasks&gt;
 * </pre>
 * 
 * @author RA
 * @see KeyValue
 */
public class KeyValueMapImpl {

    // ~ Instance fields ==================================================

    private static final Log log = LogFactory.getLog(KeyValueMapImpl.class);

    private KeyValueServ keyValueServ;

    /**
     * Key Value Map
     */
    private final Map<String, String> KEY_VALUE_MAP = new ConcurrentHashMap<String, String>();

    // ~ Methods ==================================================

    /**
     * Initialize (spring init-method)
     */
    public void init() {

        List<KeyValue> results = keyValueServ.findAll();
        if (log.isDebugEnabled()) {
            log.info("Start put key value to map...");
        }
        for (KeyValue result : results) {
            if (log.isDebugEnabled()) {
                log.info("now put : " + result.getKey() + "--->"
                        + CommUtil.subPostfix(result.getValue(), 0, 3, "***"));
            }
            KEY_VALUE_MAP.put(result.getKey(), result.getValue());
        }
        log.info("done.");
        // Initialize
        Conf.init(getMap());
        Conf.onChange(getMap());

    }

    /**
     * Get value
     * 
     * @param key
     * @return
     */
    public String getValue(String key) {
        if (CommUtil.isBlank(key)) {
            return null;
        }
        return KEY_VALUE_MAP.get(key);
    }

    /**
     * Get the duplicate map
     * 
     * @param key
     * @return
     */
    public Map<String, String> getMap() {

        final Map<String, String> temp = new ConcurrentHashMap<String, String>();
        temp.putAll(KEY_VALUE_MAP);

        return temp;
    }

    /**
     * Update not persist data
     */
    public void update() {

        List<KeyValue> results = keyValueServ.findNoPersist();
        if (log.isDebugEnabled()) {
            log.debug("start update KEY_VALUE_MAP...");
        }
        for (KeyValue result : results) {
            if (log.isDebugEnabled()) {
                log.info("now update : " + result.getKey() + "--->"
                        + CommUtil.subPostfix(result.getValue(), 0, 3, "***"));
            }
            KEY_VALUE_MAP.put(result.getKey(), result.getValue());
        }
        if (log.isDebugEnabled()) {
            log.info("done.");
        }
        // update
        Conf.onChange(getMap());
    }

    /**
     * @param keyValueServ
     *            the keyValueServ to set
     */
    public void setKeyValueServ(KeyValueServ keyValueServ) {
        this.keyValueServ = keyValueServ;
    }

}