/*
 * 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
 *
 * https://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;

import org.agrona.concurrent.status.AtomicCounter;

import java.util.concurrent.TimeUnit;

/**
 * Aeron client library tracker.
 */
public class AeronClient implements DriverManagedResource
{
    private final long clientId;
    private final long clientLivenessTimeoutMs;
    private final AtomicCounter clientTimeouts;
    private final AtomicCounter heartbeatStatus;
    private long timeOfLastKeepaliveMs;
    private boolean reachedEndOfLife = false;
    private boolean closedByCommand = false;

    public AeronClient(
        final long clientId,
        final long clientLivenessTimeoutNs,
        final long nowMs,
        final AtomicCounter clientTimeouts,
        final AtomicCounter heartbeatStatus)
    {
        this.clientId = clientId;
        this.clientLivenessTimeoutMs = Math.max(1, TimeUnit.NANOSECONDS.toMillis(clientLivenessTimeoutNs));
        this.timeOfLastKeepaliveMs = nowMs;
        this.clientTimeouts = clientTimeouts;
        this.heartbeatStatus = heartbeatStatus;

        heartbeatStatus.setOrdered(nowMs);
    }

    public void close()
    {
        if (!heartbeatStatus.isClosed())
        {
            heartbeatStatus.close();
        }
    }

    public long clientId()
    {
        return clientId;
    }

    public void timeOfLastKeepaliveMs(final long nowMs)
    {
        timeOfLastKeepaliveMs = nowMs;
        heartbeatStatus.setOrdered(nowMs);
    }

    public boolean hasTimedOut()
    {
        return reachedEndOfLife;
    }

    public void onTimeEvent(final long timeNs, final long timeMs, final DriverConductor conductor)
    {
        if (timeMs > (timeOfLastKeepaliveMs + clientLivenessTimeoutMs))
        {
            reachedEndOfLife = true;

            if (!closedByCommand)
            {
                clientTimeouts.incrementOrdered();
                conductor.clientTimeout(clientId);
            }
        }
    }

    public boolean hasReachedEndOfLife()
    {
        return reachedEndOfLife;
    }

    void onClosedByCommand()
    {
        closedByCommand = true;
        timeOfLastKeepaliveMs = 0;
    }
}

@@ -986,54 +986,17 @@
 beat
-Status;%0A    private long timeOfLastKeepaliveMs
+Timestamp
 ;%0A  
@@ -1289,22 +1289,25 @@
 eartbeat
-Status
+Timestamp
 )%0A    %7B%0A
@@ -1452,52 +1452,8 @@
 ));%0A
-        this.timeOfLastKeepaliveMs = nowMs;%0A
     
@@ -1516,22 +1516,25 @@
 eartbeat
-Status
+Timestamp
  = heart
@@ -1537,22 +1537,25 @@
 eartbeat
-Status
+Timestamp
 ;%0A%0A     
@@ -1558,38 +1558,41 @@
        heartbeat
-Status
+Timestamp
 .setOrdered(nowM
@@ -1654,22 +1654,25 @@
 eartbeat
-Status
+Timestamp
 .isClose
@@ -1707,22 +1707,25 @@
 eartbeat
-Status
+Timestamp
 .close()
@@ -1882,62 +1882,26 @@
     
-timeOfLastKeepaliveMs = nowMs;%0A        heartbeatStatus
+heartbeatTimestamp
 .set
@@ -2129,37 +2129,40 @@
 meMs %3E (
-timeOfLastKeepaliveMs
+heartbeatTimestamp.get()
  + clien
@@ -2577,33 +2577,33 @@
     
-timeOfLastKeepaliveMs = 0
+heartbeatTimestamp.set(0)
 ;%0A  

Use counter in AeronClient driver representation to save a redundant field. Client could later update this field without requiring a message.