com.eightkdata.mongowp.bson.netty.pool.StringPool Maven / Gradle / Ivy

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/*
 * This file is part of MongoWP.
 *
 * MongoWP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MongoWP 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with bson-netty. If not, see .
 *
 * Copyright (C) 2016 8Kdata.
 * 
 */

package com.eightkdata.mongowp.bson.netty.pool;

import com.eightkdata.mongowp.bson.netty.annotations.ConservesIndexes;
import com.eightkdata.mongowp.bson.netty.annotations.Tight;
import com.google.common.base.Charsets;
import io.netty.buffer.ByteBuf;
import javax.annotation.concurrent.ThreadSafe;
import javax.inject.Inject;

/**
 *
 */
@ThreadSafe
public abstract class StringPool {

    private final StringPoolPolicy heuristic;

    @Inject
    public StringPool(StringPoolPolicy heuristic) {
        this.heuristic = heuristic;
    }

    protected static String getString(@Tight @ConservesIndexes ByteBuf stringBuf) {
        return stringBuf.toString(Charsets.UTF_8);
    }

    public String fromPool(boolean likelyCacheable, @Tight @ConservesIndexes ByteBuf stringBuf) {
        if (!heuristic.apply(likelyCacheable, stringBuf)) {
            return getString(stringBuf);
        }
        return retrieveFromPool(stringBuf);
    }

    protected abstract String retrieveFromPool(@Tight @ConservesIndexes ByteBuf stringBuf);

}