com.liferay.portal.kernel.util.UnsyncPrintWriterPool.java Source code

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Here is the source code for com.liferay.portal.kernel.util.UnsyncPrintWriterPool.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.portal.kernel.util;

import com.liferay.petra.lang.CentralizedThreadLocal;
import com.liferay.petra.memory.PoolAction;
import com.liferay.petra.memory.SoftReferencePool;
import com.liferay.portal.kernel.io.OutputStreamWriter;
import com.liferay.portal.kernel.io.unsync.UnsyncPrintWriter;

import java.io.OutputStream;
import java.io.Writer;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Shuyang Zhou
 */
public class UnsyncPrintWriterPool {

    public static UnsyncPrintWriter borrow(OutputStream outputStream) {
        return borrow(new OutputStreamWriter(outputStream));
    }

    public static UnsyncPrintWriter borrow(OutputStream outputStream, String charsetName) {

        return borrow(new OutputStreamWriter(outputStream, charsetName, true));
    }

    public static UnsyncPrintWriter borrow(Writer writer) {
        if (!isEnabled()) {
            return new UnsyncPrintWriter(writer);
        }

        UnsyncPrintWriter unsyncPrintWriter = _unsyncPrintWriterSoftReferencePool.borrowObject(writer);

        List<UnsyncPrintWriter> unsyncPrintWriters = _borrowedUnsyncPrintWritersThreadLocal.get();

        unsyncPrintWriters.add(unsyncPrintWriter);

        return unsyncPrintWriter;
    }

    public static void cleanUp() {
        List<UnsyncPrintWriter> unsyncPrintWriters = _borrowedUnsyncPrintWritersThreadLocal.get();

        for (UnsyncPrintWriter unsyncPrintWriter : unsyncPrintWriters) {
            _unsyncPrintWriterSoftReferencePool.returnObject(unsyncPrintWriter);
        }

        unsyncPrintWriters.clear();
    }

    public static boolean isEnabled() {
        return _enabledThreadLocal.get();
    }

    public static void setEnabled(boolean enabled) {
        _enabledThreadLocal.set(enabled);
    }

    private static final ThreadLocal<List<UnsyncPrintWriter>> _borrowedUnsyncPrintWritersThreadLocal = new CentralizedThreadLocal<>(
            UnsyncPrintWriterPool.class.getName() + "._borrowedUnsyncPrintWritersThreadLocal", ArrayList::new);
    private static final ThreadLocal<Boolean> _enabledThreadLocal = new CentralizedThreadLocal<>(
            UnsyncPrintWriterPool.class.getName() + "._enabledThreadLocal", () -> Boolean.FALSE);
    private static final SoftReferencePool<UnsyncPrintWriter, Writer> _unsyncPrintWriterSoftReferencePool = new SoftReferencePool<>(
            new UnsyncPrintWriterPoolAction(), 8192);

    private static class UnsyncPrintWriterPoolAction implements PoolAction<UnsyncPrintWriter, Writer> {

        @Override
        public UnsyncPrintWriter onBorrow(UnsyncPrintWriter unsyncPrintWriter, Writer writer) {

            unsyncPrintWriter.reset(writer);

            return unsyncPrintWriter;
        }

        @Override
        public UnsyncPrintWriter onCreate(Writer writer) {
            return new UnsyncPrintWriter(writer);
        }

        @Override
        public void onReturn(UnsyncPrintWriter unsyncPrintWriter) {
            unsyncPrintWriter.reset(null);
        }

    }

}