
com.epam.deltix.util.net.timer.TimerClient Maven / Gradle / Ivy
/*
* Copyright 2021 EPAM Systems, Inc
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. 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 com.epam.deltix.util.net.timer;
import com.epam.deltix.util.io.*;
import com.epam.deltix.util.lang.*;
import com.epam.deltix.util.memory.*;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.io.*;
import java.net.*;
/**
*
*/
public class TimerClient extends Thread {
private final String host;
private final int port;
private Socket socket;
private InputStream is;
private final byte [] buffer = new byte [8];
private volatile long correction = 0;
public TimerClient (String host) {
this (host, TimerServer.DEF_PORT);
}
public TimerClient (String host, int port) {
super ("Timer Client Thread <-- " + host + ":" + port);
if (host == null)
host = "localhost";
this.host = host;
this.port = port;
setDaemon (true);
}
public long nanoTime () {
return (System.nanoTime () + correction);
}
@SuppressFBWarnings("UNENCRYPTED_SOCKET")
@Override
public void run () {
try {
socket = new Socket (host, port);
socket.setTcpNoDelay (true);
socket.setSoTimeout (0);
socket.setKeepAlive (true);
socket.setReuseAddress (true);
is = socket.getInputStream ();
for (int ii = 1; ii < TimerServer.WARMUP_NUM; ii++)
applyCorrection ();
for (;;) {
long oldCorrection = correction;
applyCorrection ();
// System.out.println (
// "Correction adjustment: " + (correction - oldCorrection)
// );
}
} catch (Exception x) {
Util.handleException (x);
} finally {
Util.close (socket);
}
}
private void applyCorrection () throws IOException {
IOUtil.readFully (is, buffer, 0, 8);
long st = DataExchangeUtils.readLong (buffer, 0);
correction = st - System.nanoTime ();
}
}
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