io.questdb.cairo.pool.AbstractPool Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of core Show documentation
QuestDB is High Performance Time Series Database
The newest version!
/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

package io.questdb.cairo.pool;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.std.FilesFacade;
import io.questdb.std.Unsafe;
import io.questdb.std.microtime.MicrosecondClock;

import java.io.Closeable;

abstract class AbstractPool implements Closeable {
    public static final long CLOSED = Unsafe.getFieldOffset(AbstractPool.class, "closed");
    protected static final long UNALLOCATED = -1L;
    private static final int TRUE = 1;
    private static final int FALSE = 0;
    protected final FilesFacade ff;
    protected final MicrosecondClock clock;
    private final long inactiveTtlUs;
    private final CairoConfiguration configuration;
    private PoolListener eventListener;
    @SuppressWarnings("FieldCanBeLocal")
    private volatile int closed = FALSE;

    public AbstractPool(CairoConfiguration configuration, long inactiveTtlMillis) {
        this.configuration = configuration;
        this.ff = configuration.getFilesFacade();
        this.clock = configuration.getMicrosecondClock();
        this.inactiveTtlUs = inactiveTtlMillis * 1000;
    }

    @Override
    public final void close() {
        if (Unsafe.getUnsafe().compareAndSwapInt(this, CLOSED, FALSE, TRUE)) {
            closePool();
        }
    }

    public CairoConfiguration getConfiguration() {
        return configuration;
    }

    public PoolListener getPoolListener() {
        return eventListener;
    }

    public void setPoolListener(PoolListener eventListener) {
        this.eventListener = eventListener;
    }

    public boolean releaseAll() {
        return releaseAll(Long.MAX_VALUE);
    }

    public boolean releaseInactive() {
        return releaseAll(clock.getTicks() - inactiveTtlUs);
    }

    protected void closePool() {
        releaseAll(Long.MAX_VALUE);
        notifyListener(Thread.currentThread().getId(), null, PoolListener.EV_POOL_CLOSED);
    }

    protected boolean isClosed() {
        return closed == TRUE;
    }

    protected void notifyListener(long thread, CharSequence name, short event) {
        PoolListener listener = getPoolListener();
        if (listener != null) {
            listener.onEvent(PoolListener.SRC_WRITER, thread, name, event, (short) 0, (short) 0);
        }
    }

    protected abstract boolean releaseAll(long deadline);
}