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/*
* VS is (c) 2008 by Paul C. Buetow
* vs@dev.buetow.org
*/
package protocols.implementations;
import java.util.ArrayList;
import java.util.Vector;
import protocols.VSAbstractProtocol;
import core.VSMessage;
/**
* The Class TwoPhaseCommitProtocol.
*/
public class TwoPhaseCommitProtocol extends VSAbstractProtocol {
private static final long serialVersionUID = 1L;
/* Server variables, coordinator */
private ArrayList<Integer> pids;
/* Client variables */
private boolean ackSent;
/**
* Instantiates a one phase commit protocol.
*/
public TwoPhaseCommitProtocol() {
setClassname(getClass().toString());
/* Can be changed via GUI variables editor of each process */
Vector<Integer> vec = new Vector<Integer>();
vec.add(2);
vec.add(3);
initVector("pids", vec, "PIDs beteilitger Prozesse");
initLong("timeout", 5000, "Zeit bis erneuerter Anfrage", "ms");
}
/* (non-Javadoc)
* @see events.VSAbstractEvent#onInit()
*/
protected void onInit() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientReset()
*/
protected void onClientReset() {
pids.clear();
pids.addAll(getVector("pids"));
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientStart()
*/
protected void onClientStart() {
if (pids == null) {
pids = new ArrayList<Integer>();
pids.addAll(getVector("pids"));
}
if (pids.size() != 0) {
long timeout = getLong("timeout") + process.getTime();
scheduleAt(timeout); /* Will run onClientSchedule() at the specified local time */
VSMessage message = new VSMessage();
message.setBoolean("wantAck", true);
sendMessage(message);
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
*/
protected void onClientRecv(VSMessage recvMessage) {
if (pids.size() == 0)
return;
if (recvMessage.getBoolean("isAck")) {
Integer pid = recvMessage.getIntegerObj("pid");
if (pids.contains(pid))
pids.remove(pid);
logg("ACK von Prozess " + pid + " erhalten!");
if (pids.size() == 0)
logg("ACKs von allen beteiligten Prozessen erhalten!");
}
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientSchedule()
*/
protected void onClientSchedule() {
onClientStart();
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerReset()
*/
protected void onServerReset() {
ackSent = false;
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
*/
protected void onServerRecv(VSMessage recvMessage) {
if (ackSent)
return;
VSMessage message = new VSMessage();
message.setBoolean("isAck", true);
message.setInteger("pid", process.getProcessID());
sendMessage(message);
ackSent = true;
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerSchedule()
*/
protected void onServerSchedule() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#toString()
*/
public String toString() {
return super.toString();
}
}
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