JsonTray.java

/**
 *  JsonTray
 *  Copyright 2016 by Michael Peter Christen
 *  First released 05.06.2016
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program in the file lgpl21.txt
 *  If not, see <http://www.gnu.org/licenses/>.
 */


package org.loklak.tools.storage;

import java.io.File;
import java.io.IOException;
import java.util.LinkedHashMap;

import org.json.JSONObject;
import org.loklak.tools.CacheMap;

public class JsonTray {
    
    private JsonFile per;
    private CacheMap<String, JSONObject> vol;
    
    public JsonTray(File file, int cachesize) throws IOException {
        this.per = new JsonFile(file);
        this.vol = new CacheMap<String, JSONObject>(cachesize);
    }
    
    public boolean has(String key) {
        synchronized(this.vol) {
            if (this.vol.exist(key)) return true;
        }
        return this.per.has(key);
    }
    
    public JsonTray put(String key, JSONObject value, boolean persistent) {
        if (persistent) putPersistent(key, value); else putVolatile(key, value);
        return this;
    }
    
    public JsonTray putPersistent(String key, JSONObject value) {
        this.per.put(key, value);
        return this;
    }
    
    public JsonTray putVolatile(String key, JSONObject value) {
        synchronized (this.vol) {
            this.vol.put(key, value);
        }
        return this;
    }
    
    public JsonTray remove(String key){
    	synchronized(this.vol) {
            if (this.vol.exist(key)){
            	this.vol.remove(key);
            	return this;
            }
        }
    	if(this.per.has(key)){
    		this.per.remove(key);
    	}
    	return this;
    }
    
    public JsonTray commit() {
        this.per.commit();
        return this;
    }
    
    public JSONObject getJSONObject(String key) {
        synchronized(this.vol) {
            JSONObject value = this.vol.get(key);
            if (value != null) return value;
        }
        return this.per.getJSONObject(key);
    }
    
    // for debug reasons
    public JSONObject getPersistent(){
    	JSONObject res = new JSONObject();
    	for(String key : this.per.keySet()){
    		res.put(key, this.per.get(key));
    	}
    	return res;
    }
    
    // for debug reasons
    public JSONObject getVolatile(){
    	JSONObject res = new JSONObject();
    	synchronized(this.vol) {
    		LinkedHashMap<String,JSONObject> map = this.vol.getMap();
	    	for(String key : map.keySet()){
	    		res.put(key, map.get(key));
	    	}
    	}
    	return res;
    }
}