org.pentaho.reporting.platform.plugin.async.JobIdGenerator.java Source code

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Here is the source code for org.pentaho.reporting.platform.plugin.async.JobIdGenerator.java

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/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License, version 2 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/gpl-2.0.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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 General Public License for more details.
 *
 *
 * Copyright 2006 - 2017 Hitachi Vantara.  All rights reserved.
 */

package org.pentaho.reporting.platform.plugin.async;

import com.google.common.collect.Sets;
import org.pentaho.platform.api.engine.ILogoutListener;
import org.pentaho.platform.api.engine.IPentahoSession;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.reporting.libraries.base.util.ArgumentNullException;

import java.util.Collections;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

public class JobIdGenerator implements ILogoutListener, IJobIdGenerator {

    private static final String SESSION = "session";
    public static final String ID = "id";

    private ConcurrentHashMap<IPentahoSession, Set<Object>> reservedIds = new ConcurrentHashMap<>();

    public JobIdGenerator() {
        PentahoSystem.addLogoutListener(this);
    }

    @Override
    public void onLogout(final IPentahoSession session) {
        if (session != null) {
            reservedIds.remove(session);
        }
    }

    @Override
    public UUID generateId(final IPentahoSession session) {
        ArgumentNullException.validate(SESSION, session);
        final Set<Object> freshSet = Sets.newConcurrentHashSet();
        final UUID uuid = UUID.randomUUID();

        Set<Object> sessionIds = reservedIds.putIfAbsent(session, freshSet);
        if (sessionIds == null) {
            sessionIds = freshSet;
        }
        sessionIds.add(uuid);
        return uuid;
    }

    @Override
    public boolean acquire(final IPentahoSession session, final UUID id) {
        ArgumentNullException.validate(SESSION, session);
        //It is totally safe if id is null but requires not null session
        return reservedIds.getOrDefault(session, Collections.emptySet()).remove(id);
    }
}