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V4PingReply.java
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V4PingReply.java
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/*******************************************************************************
* This file is part of OpenNMS(R).
*
* Copyright (C) 2011-2014 The OpenNMS Group, Inc.
* OpenNMS(R) is Copyright (C) 1999-2014 The OpenNMS Group, Inc.
*
* OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
*
* OpenNMS(R) is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License,
* or (at your option) any later version.
*
* OpenNMS(R) is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with OpenNMS(R). If not, see:
* http://www.gnu.org/licenses/
*
* For more information contact:
* OpenNMS(R) Licensing <license@opennms.org>
* http://www.opennms.org/
* http://www.opennms.com/
*******************************************************************************/
package org.opennms.jicmp.standalone;
import java.nio.ByteBuffer;
import java.util.concurrent.TimeUnit;
import org.opennms.jicmp.ip.ICMPEchoPacket;
import org.opennms.jicmp.ip.ICMPPacket;
class V4PingReply extends ICMPEchoPacket implements PingReply {
// The below long is equivalent to the next line and is more efficient than
// manipulation as a string
// StandardCharsets.US_ASCII.encode("OpenNMS!").getLong(0);
public static final long COOKIE = 0x4F70656E4E4D5321L;
private long m_receivedTimeNanos;
public V4PingReply(ICMPPacket icmpPacket, long receivedTimeNanos) {
super(icmpPacket);
m_receivedTimeNanos = receivedTimeNanos;
}
public boolean isValid() {
ByteBuffer content = getContentBuffer();
/* we ensure the length can contain 2 longs (cookie and sent time)
and that the cookie matches */
return content.limit() >= 16 && COOKIE == content.getLong(0);
}
public boolean isEchoReply() {
return Type.EchoReply.equals(getType());
}
@Override
public long getSentTimeNanos() {
return getContentBuffer().getLong(8);
}
@Override
public long getReceivedTimeNanos() {
return m_receivedTimeNanos;
}
@Override
public double elapsedTime(TimeUnit unit) {
double nanosPerUnit = TimeUnit.NANOSECONDS.convert(1, unit);
return getElapsedTimeNanos() / nanosPerUnit;
}
@Override
public long getElapsedTimeNanos() {
return getReceivedTimeNanos() - getSentTimeNanos();
}
@Override
public long getThreadId() {
return getIdentifier();
}
}