com.liferay.document.library.repository.external.cache.ConnectionCache.java Source code

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Here is the source code for com.liferay.document.library.repository.external.cache.ConnectionCache.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.document.library.repository.external.cache;

import com.liferay.portal.kernel.repository.RepositoryException;
import com.liferay.portal.kernel.servlet.PortalSessionThreadLocal;
import com.liferay.portal.kernel.util.AutoResetThreadLocal;
import com.liferay.portal.kernel.util.StringPool;
import com.liferay.portal.kernel.util.TransientValue;

import javax.servlet.http.HttpSession;

/**
 * @author Ivn Zaera
 */
public class ConnectionCache<T> {

    public ConnectionCache(Class<T> connectionClass, long repositoryId, ConnectionBuilder<T> connectionBuilder) {

        _connectionBuilder = connectionBuilder;

        _sessionKey = ConnectionCache.class.getName() + StringPool.POUND + repositoryId;

        _connectionThreadLocal = new AutoResetThreadLocal<>(connectionClass.getName());
    }

    public T getConnection() throws RepositoryException {
        T connection = null;

        HttpSession httpSession = PortalSessionThreadLocal.getHttpSession();

        if (httpSession != null) {
            TransientValue<T> transientValue = (TransientValue<T>) httpSession.getAttribute(_sessionKey);

            if (transientValue != null) {
                connection = transientValue.getValue();
            }
        } else {
            connection = _connectionThreadLocal.get();
        }

        if (connection != null) {
            return connection;
        }

        connection = _connectionBuilder.buildConnection();

        if (httpSession != null) {
            TransientValue<T> transientValue = new TransientValue<>(connection);

            httpSession.setAttribute(_sessionKey, transientValue);
        }

        _connectionThreadLocal.set(connection);

        return connection;
    }

    private final ConnectionBuilder<T> _connectionBuilder;
    private final ThreadLocal<T> _connectionThreadLocal;
    private final String _sessionKey;

}