com.reydentx.core.cache.GuavaBaseCache.java Source code

Introduction

Here is the source code for com.reydentx.core.cache.GuavaBaseCache.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.reydentx.core.cache;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.reydentx.core.config.RConfig;
import java.util.concurrent.TimeUnit;

/**
 * Cache bases on Guava LoadingCache
 *
 * @author ducnt3
 * @param <K> key
 * @param <V> value
 */
public abstract class GuavaBaseCache<K, V> implements RCache<K, V> {

    private LoadingCache<K, V> _innerCache;
    private final String _name;
    private V _emptyValue;
    private int _maximunSize = 1000;
    private int _expireAfterAccess = 24 * 60; // minute

    // Constructor and Init
    /////////////////////////////////////////////////////////
    public GuavaBaseCache(String name) {
        this._name = name;
        initCache();
    }

    private void initCache() {
        // get cache config
        _maximunSize = RConfig.Instance.getInt(this.getClass(), _name, "maximum-size", _maximunSize);
        _expireAfterAccess = RConfig.Instance.getInt(this.getClass(), _name, "expire-after-access",
                _expireAfterAccess);

        // init cache loader & default value
        CacheLoader<K, V> cacheLoader = declareCacheLoader();
        _emptyValue = declareEmptyValue();

        // init cache
        _innerCache = CacheBuilder.newBuilder().maximumSize(_maximunSize)
                .expireAfterAccess(_expireAfterAccess, TimeUnit.MINUTES).build(cacheLoader);
    }

    // Need to be overrided functions
    /////////////////////////////////////////////////////////
    abstract CacheLoader<K, V> declareCacheLoader();

    abstract V declareEmptyValue();

    // Cache core APIs
    /////////////////////////////////////////////////////////
    @Override
    public void put(K key, V value) {
        _innerCache.put(key, value);
    }

    @Override
    public V get(K key) {
        try {
            return _innerCache.get(key);
        } catch (Exception ex) {

        }

        return _emptyValue;
    }

    @Override
    public void remove(K key) {
        _innerCache.invalidate(key);
    }
}