/* start a transaction and add to transaction table */
public Transaction start() {
Transaction t = new Transaction(random.nextInt(Integer.MAX_VALUE));
t.addCommand("start", "start");
ArrayList<RMmeta.RMtype> types = new ArrayList<RMmeta.RMtype>();
transactionTable.put(t, types);
types.add(null);
List<RMmeta> rms = middleware.resourceManagers;
synchronized (rms) {
for (RMmeta rm : rms) {
Socket s = rm.getSocket();
synchronized (s) {
try {
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
outToServer.writeBytes("start," + t.getId() + '\n');
System.out.println(inFromServer.readLine());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return t;
}
/* abort a transaction, return true if success, false if not */
public boolean abort(Transaction t) {
if (!transactionTable.keySet().contains(t)) {
System.out.println("Oops where does this transaction come from. " + t.toString());
return false;
}
System.out.println("ABORTING: " + t.toString());
List<RMmeta> rms = middleware.resourceManagers;
synchronized (rms) {
for (RMmeta rm : rms) {
Socket s = rm.getSocket();
synchronized (s) {
try {
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
outToServer.writeBytes("abort," + t.getId() + '\n');
System.out.println(inFromServer.readLine());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
this.middleware.lockManager.UnlockAll(t.getId());
t.addCommand("abort", "abort");
transactionTable.remove(t);
return true;
}
/* record a operation to a transaction */
public boolean addOperation(Transaction t, boolean read, RMmeta.RMtype type, String command) {
if (!transactionTable.keySet().contains(t)) {
System.out.println("Oops where does this transaction come from. " + t.toString());
return false;
}
String cmd;
if (read) {
cmd = String.format("read(%s)", type.toString());
} else {
cmd = String.format("write(%s)", type.toString());
}
t.addCommand(cmd, command);
transactionTable.get(t).add(type);
return true;
}
/* commit a transaction, return true if success, false if not */
public boolean commit(Transaction t) {
if (!transactionTable.keySet().contains(t)) {
System.out.println("Oops where does this transaction come from. " + t.toString());
return false;
}
System.out.println("COMMIT: " + t.toString());
t.addCommand("commit", "commit");
List<RMmeta> rms = middleware.resourceManagers;
synchronized (rms) {
boolean result = true;
// ask each rm to vote
for (RMmeta rm : rms) {
Socket s = rm.getSocket();
synchronized (s) {
try {
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
outToServer.writeBytes("vote," + t.getId() + '\n');
// crash point
if (middleware.crashType
== MiddlewareCrashType
.CRASH_AFTER_SENDING_VOTE_REQUEST_AND_BEFORE_RECEIVING_ANY_REPLIES) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
String ret = inFromServer.readLine();
// if any return null(crash) or no then result is false
if (ret == null || ret.compareToIgnoreCase("no") == 0) result = false;
} catch (Exception e) {
e.printStackTrace();
}
}
}
// crash point
if (middleware.crashType
== MiddlewareCrashType.CRASH_AFTER_RECEIVING_ALL_REPLIES_BUT_BEFORE_DECIDING) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
// if all vote yes, then commit
if (result) {
System.out.println("Decide to commit:" + t.toString());
// crash point
if (middleware.crashType
== MiddlewareCrashType.CRASH_AFTER_DECIDING_BUT_BEFORE_SENDING_DECISION) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
for (RMmeta rm : rms) {
Socket s = rm.getSocket();
synchronized (s) {
try {
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
outToServer.writeBytes("commit," + t.getId() + '\n');
System.out.println(inFromServer.readLine());
// crash point
if (middleware.crashType
== MiddlewareCrashType.CRASH_AFTER_SENDING_SOME_BUT_NOT_ALL_DECISIONS) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
t.addCommand("commit", "commit");
// if any vote no, then abort
} else {
System.out.println("Decide to abort: " + t.toString());
// crash point
if (middleware.crashType
== MiddlewareCrashType.CRASH_AFTER_DECIDING_BUT_BEFORE_SENDING_DECISION) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
for (RMmeta rm : rms) {
Socket s = rm.getSocket();
synchronized (s) {
try {
BufferedReader inFromServer =
new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
outToServer.writeBytes("abort," + t.getId() + '\n');
System.out.println(inFromServer.readLine());
// crash point
if (middleware.crashType
== MiddlewareCrashType.CRASH_AFTER_SENDING_SOME_BUT_NOT_ALL_DECISIONS) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
t.addCommand("abort", "abort");
}
// crash point
if (middleware.crashType == MiddlewareCrashType.CRASH_AFTER_HAVING_SENT_ALL_DECISIONS) {
System.out.println(middleware.crashType.toString());
System.exit(1);
}
}
this.middleware.lockManager.UnlockAll(t.getId());
transactionTable.remove(t);
return true;
}