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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service
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/*
 * Copyright (c) [2016] [  ]
 * This file is part of the ethereumJ library.
 *
 * The ethereumJ 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 3 of the License, or
 * (at your option) any later version.
 *
 * The ethereumJ 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 the ethereumJ library. If not, see .
 */
package org.ethereum.datasource;

import java.util.Collection;

/**
 * Facade class which encapsulates both Read and Write caches
 *
 * Created by Anton Nashatyrev on 29.11.2016.
 */
public class ReadWriteCache
        extends SourceChainBox
        implements CachedSource {

    protected ReadCache readCache;
    protected WriteCache writeCache;

    protected ReadWriteCache(Source source) {
        super(source);
    }

    public ReadWriteCache(Source src , WriteCache writeCacheParam) {
    	super(src);
    	add(writeCache = writeCacheParam);
    	add(readCache = new ReadCache<>(writeCacheParam));
    	readCache.setFlushSource(true);
    }

    public ReadWriteCache(Source src, WriteCache.CacheType cacheType) {
        super(src);
        add(writeCache = new WriteCache<>(src, cacheType));
        add(readCache = new ReadCache<>(writeCache));
        readCache.setFlushSource(true);
    }

    @Override
    public void delete(Key key) {
        super.delete(key);
        writeCache.getCache().remove(key);
        readCache.delete(key);
        writeCache.delete(key);
    }

    @Override
    public synchronized Collection getModified() {
        return writeCache.getModified();
    }

    @Override
    public boolean hasModified() {
        return writeCache.hasModified();
    }

    protected synchronized AbstractCachedSource.Entry getCached(Key key) {
        AbstractCachedSource.Entry v = readCache.getCached(key);
        if (v == null) {
            v = writeCache.getCached(key);
        }
        return v;
    }

    @Override
    public synchronized long estimateCacheSize() {
        return readCache.estimateCacheSize() + writeCache.estimateCacheSize();
    }

    public static class BytesKey extends ReadWriteCache {
        public BytesKey(Source src, WriteCache.CacheType cacheType) {
            super(src);
            add(this.writeCache = new WriteCache.BytesKey<>(src, cacheType));
            add(this.readCache = new ReadCache.BytesKey<>(writeCache));
            readCache.setFlushSource(true);
        }
    }
}