io.aeron.driver.status.PerImageIndicator Maven / Gradle / Ivy

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/*
 * Copyright 2014-2019 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 io.aeron.driver.status;

import org.agrona.MutableDirectBuffer;
import org.agrona.concurrent.status.AtomicCounter;
import org.agrona.concurrent.status.CountersManager;

/**
 * Allocates {@link AtomicCounter} indicating a per {@link io.aeron.driver.PublicationImage} indication of presence for
 * {@link io.aeron.driver.CongestionControl}.
 */
public class PerImageIndicator
{
    /**
     * Type id of a per Image indicator.
     */
    public static final int PER_IMAGE_TYPE_ID = 10;

    /**
     * Allocate a per {@link io.aeron.driver.PublicationImage} indicator.
     *
     * @param tempBuffer      to be used for labels and key.
     * @param name            of the counter for the label.
     * @param countersManager from which to allocated the underlying storage.
     * @param registrationId  to be associated with the counter.
     * @param sessionId       for the stream of messages.
     * @param streamId        for the stream of messages.
     * @param channel         for the stream of messages.
     * @return a new {@link AtomicCounter} for tracking the indicator.
     */
    public static AtomicCounter allocate(
        final MutableDirectBuffer tempBuffer,
        final String name,
        final CountersManager countersManager,
        final long registrationId,
        final int sessionId,
        final int streamId,
        final String channel)
    {
        final int counterId = StreamPositionCounter.allocateCounterId(
            tempBuffer, name, PER_IMAGE_TYPE_ID, countersManager, registrationId, sessionId, streamId, channel);

        return new AtomicCounter(countersManager.valuesBuffer(), counterId, countersManager);
    }
}