org.agrona.concurrent.status.UnsafeBufferStatusIndicator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of Agrona Show documentation

High performance primitives and utility library.

There is a newer version: 0.9.1

/*
 * Copyright 2014 - 2016 Real Logic Ltd.
 *
 * 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 org.agrona.concurrent.status;

import org.agrona.UnsafeAccess;
import org.agrona.concurrent.AtomicBuffer;

import static org.agrona.BitUtil.SIZE_OF_LONG;

public class UnsafeBufferStatusIndicator implements StatusIndicator
{
    private final int counterId;
    private final long addressOffset;
    private final byte[] buffer;

    /**
     * Map a status indicator over a buffer.
     *
     * @param buffer    containing the indicator.
     * @param counterId identifier of the indicator.
     */
    public UnsafeBufferStatusIndicator(final AtomicBuffer buffer, final int counterId)
    {
        this.counterId = counterId;
        this.buffer = buffer.byteArray();

        final int counterOffset = CountersManager.counterOffset(counterId);
        buffer.boundsCheck(counterOffset, SIZE_OF_LONG);
        this.addressOffset = buffer.addressOffset() + counterOffset;
    }

    public int id()
    {
        return counterId;
    }

    public void setOrdered(long value)
    {
        UnsafeAccess.UNSAFE.putOrderedLong(buffer, addressOffset, value);
    }

    public long getVolatile()
    {
        return UnsafeAccess.UNSAFE.getLongVolatile(buffer, addressOffset);
    }
}