public boolean enlist(int xid, ResourceManager rm) throws RemoteException {
if (enlistList.containsKey(xid)) {
Set<ResourceManager> set = enlistList.get(xid);
Iterator<ResourceManager> i = set.iterator();
ResourceManager r = null;
while (i.hasNext()) {
try {
r = i.next();
r.getMyRMIName();
} catch (Exception e) {
enlistList.get(xid).remove(r);
System.out.println("A hole in enlist.");
}
}
enlistList.get(xid).add(rm);
protocolDB.get(xid).put(rm.getMyRMIName(), rm.getStatus(xid));
} else {
Set<ResourceManager> set = new HashSet<ResourceManager>();
set.add(rm);
enlistList.put(xid, set);
HashMap<String, TwoPC_ST> map = new HashMap<String, TwoPC_ST>();
map.put(rm.getMyRMIName(), TwoPC_ST.Initiated);
protocolDB.put(xid, map);
}
return true;
}
public void abortOtherRMsExcept(String rmName, int xid)
throws RemoteException, InvalidTransactionException {
Set<ResourceManager> set = enlistList.get(xid);
Iterator<ResourceManager> i = set.iterator();
ResourceManager r = null;
while (i.hasNext()) {
r = i.next();
if (r.getMyRMIName().equals(rmName)) {
enlistList.get(xid).remove(r);
break;
}
}
abort(xid);
}
public void sendVote(ResourceManager rm, int xid, TwoPC_ST result) throws RemoteException {
protocolDB.get(xid).put(rm.getMyRMIName(), result);
}
public static void main(String args[])
throws RemoteException, InvalidTransactionException, TransactionAbortedException {
System.setSecurityManager(new RMISecurityManager());
String rmiPort = System.getProperty("rmiPort");
if (rmiPort == null) {
rmiPort = "";
} else if (!rmiPort.equals("")) {
rmiPort = "//:" + rmiPort + "/";
}
try {
TransactionManagerImpl obj = new TransactionManagerImpl();
Naming.rebind(rmiPort + TransactionManager.RMIName, obj);
System.out.println("TM bound");
} catch (Exception e) {
System.err.println("TM not bound:" + e);
System.exit(1);
}
enlistList = new HashMap<Integer, Set<ResourceManager>>();
File f = new File(enlistFile);
if (f.exists()) {
try {
ObjectInputStream fin = new ObjectInputStream(new FileInputStream(f));
enlistList = (HashMap<Integer, Set<ResourceManager>>) fin.readObject();
fin.close();
} catch (Exception e) {
e.printStackTrace();
}
}
protocolDB = new HashMap<Integer, Map<String, TwoPC_ST>>();
File f2 = new File(protocolDBFile);
if (f2.exists()) {
try {
ObjectInputStream fin2 = new ObjectInputStream(new FileInputStream(f2));
protocolDB = (HashMap<Integer, Map<String, TwoPC_ST>>) fin2.readObject();
fin2.close();
} catch (Exception e) {
e.printStackTrace();
}
// recovery
for (Integer i : protocolDB.keySet()) {
if (i > xidCounter) {
xidCounter = i + 1;
}
Map<String, TwoPC_ST> lastST = protocolDB.get(i);
boolean re1 = true;
for (TwoPC_ST st : lastST.values()) re1 &= (st == TwoPC_ST.Committed);
if (re1) {
protocolDB.remove(i);
enlistList.remove(i);
continue;
}
System.out.println("TM recovery xid: " + i + " from half commit.");
Set<ResourceManager> commitSet = enlistList.get(i);
boolean re2 = true;
Set<ResourceManager> commitSet2 = new HashSet<ResourceManager>();
for (ResourceManager r : commitSet) {
if (r.getStatus(i) == TwoPC_ST.Prepared) {
System.out.println("TM recovery " + i + " in " + r.getMyRMIName());
commitSet2.add(r);
} else if (r.getStatus(i) == TwoPC_ST.Committed) ;
else re2 = false;
}
System.out.println("here 1");
if (re2) {
for (ResourceManager r : commitSet2) {
r.commit(i);
}
protocolDB.remove(i);
enlistList.remove(i);
}
}
}
}
public boolean commit(int xid)
throws RemoteException, TransactionAbortedException, InvalidTransactionException {
System.out.println("TM starts to commit " + xid);
if (!xidIsValid(xid)) {
File f = new File(logFile);
if (f.exists()) throw new TransactionAbortedException(xid, "");
else throw new InvalidTransactionException(xid, "");
}
if (!enlistList.containsKey(xid)) {
throw new TransactionAbortedException(xid, "Nonexist xid for TM.");
}
Set<ResourceManager> commitSet = enlistList.get(xid);
System.out.println(xid + " TM commitSet size: " + commitSet.size());
ResourceManager rm = null;
Iterator<ResourceManager> i = commitSet.iterator();
try {
while (i.hasNext()) {
rm = i.next();
rm.vote(xid, TwoPC_ST.Prepared);
rm.getMyRMIName();
System.out.println(rm.getMyRMIName() + " in TM commit " + xid);
}
} catch (Exception e) {
System.out.println("When vote, there is an exception");
enlistList.get(xid).remove(rm);
abort(xid);
throw new TransactionAbortedException(xid, "invalid rm");
}
if (dieTMBeforeCommit) dieNow();
// log "committed" here, and enlistList
try {
File logF = new File(logFile);
FileWriter fw = new FileWriter(logF.getAbsoluteFile(), true);
bw = new BufferedWriter(fw);
bw.write(Integer.toString(xid));
bw.write(" committed\n");
bw.close();
ObjectOutputStream protocolDBBackup =
new ObjectOutputStream(new FileOutputStream(protocolDBFile));
protocolDBBackup.writeObject(protocolDB);
protocolDBBackup.close();
ObjectOutputStream enlistFileBackup =
new ObjectOutputStream(new FileOutputStream(enlistFile));
enlistFileBackup.writeObject(enlistList);
enlistFileBackup.close();
} catch (IOException e) {
e.printStackTrace();
}
if (dieTMAfterCommit) dieNow();
for (ResourceManager r : commitSet) {
r.commit(xid);
}
protocolDB.remove(xid);
enlistList.remove(xid);
try {
ObjectOutputStream protocolDBBackup =
new ObjectOutputStream(new FileOutputStream(protocolDBFile));
protocolDBBackup.writeObject(protocolDB);
protocolDBBackup.close(); // enlistFile
ObjectOutputStream enlistFileBackup =
new ObjectOutputStream(new FileOutputStream(enlistFile));
enlistFileBackup.writeObject(enlistList);
enlistFileBackup.close();
} catch (IOException e) {
e.printStackTrace();
}
return true;
}