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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.query;
import com.yahoo.container.Server;
import java.util.concurrent.atomic.AtomicLong;
/**
* A query id which is unique across this cluster - consisting of
* container runtime id + timestamp + serial.
*
* @author bratseth
*/
public class SessionId {
private static final String serverId = Server.get().getServerDiscriminator();
private static final AtomicLong sequenceCounter = new AtomicLong();
private final String id;
private SessionId(String serverId, long timestamp, long sequence) {
this.id = serverId + "." + timestamp + "." + sequence;
}
public String toString() { return id; }
/**
* Creates a session id which is unique across the cluster this runtime is a member of each time this is called.
* Calling this causes synchronization.
*/
public static SessionId next() {
return new SessionId(serverId, System.currentTimeMillis(), sequenceCounter.getAndIncrement());
}
}
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