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/**
 * Copyright 2016-2021 The Reaktivity Project
 *
 * The Reaktivity Project licenses this file to you 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.reaktivity.command.log.internal.spy;

import org.agrona.DirectBuffer;
import org.reaktivity.reaktor.nukleus.function.MessagePredicate;

public interface RingBufferSpy
{
    enum SpyPosition
    {
        ZERO,
        HEAD,
        TAIL
    }

    void spyAt(SpyPosition position);

    int spy(MessagePredicate handler);
    int spy(MessagePredicate handler, int messageCountLimit);

    long producerPosition();
    long consumerPosition();

    DirectBuffer buffer();
}