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package com.sun.jts.utils.RecoveryHooks;
import java.text.MessageFormat;
import java.util.Hashtable;
import java.util.ResourceBundle;
import com.sun.jts.jtsxa.Utility;
import com.sun.jts.codegen.otsidl.JCoordinator;
import com.sun.jts.codegen.otsidl.JCoordinatorHelper;
import com.sun.jts.CosTransactions.GlobalTID;
import com.sun.jts.CosTransactions.ControlImpl;
import com.sun.jts.CosTransactions.CurrentTransaction;
import org.omg.CosTransactions.Coordinator;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import com.sun.jts.utils.LogFormatter;
/**
* This class defines API's for the test harness to induce
* recovery by setting crash points (in the case of TM crashes)
* and wait points (in the case of RM crashes).
*
* In order to induce TM crashes, the test harness sets the failure points
* by calling setCrashPoint(), after transaction.begin() from each thread.
* Thus, multiple threads involving different transactions can
* set different points of failure, which will cause the TM to wait
* at the failure points, until crash() method is invoked.
* Note: Only those transactions calling setCrashPoint() will be affected.
*
* The crash() method needs to be invoked from a seperate
* thread. The TM would increment TestRecovery.waitCount field to
* indicate the total number of failure points reached.
* When the waitCount reaches the expected value
* (obtained through getWaitCount()), the test harness shall call crash().
*
* In order to test RM recovery, the
* test harness sets the failure points by calling setWaitPoint(),
* after transaction.begin() from each thread. The TM waits at predefined
* failure points for the stipulated time duration, during which the RM is
* expected to crash; after which the TM will proceed with regular
* completion (a human is expected to crash the RM manually during the
* wait duration). As in the TM recovery case, the waitCount will be
* incremented to indicate the total number of failure points reached.
*
* If the RM does not crash during the stipulated time
* duration, the TM will proceed with normal completion for the specific
* transaction. It does not matter if the RM
* comes back alive, since the TM would anyway retry completion.
* Note: Only those transactions calling setWaitPoint() will be affected.
*
* @author Ram Jeyaraman 04/21/1999
*/
public class FailureInducer {
// static finals
public static final int ACTIVE = 0;
public static final int PREPARING = 1;
public static final int PREPARED = 2;
public static final int COMPLETING = 3;
public static final int COMPLETED = 4;
// static fields
private static boolean failureInducerIsActive = false;
private static boolean crash = false;
private static int waitPeriod = 0;
private static int waitCount = 0;
private static int recoveryWaitDuration = 0;
private static Hashtable crashList = new Hashtable();
private static Hashtable waitList = new Hashtable();
private static Hashtable waitTime = new Hashtable();
private static ResourceBundle messages = ResourceBundle.
getBundle("com.sun.jts.utils.RecoveryHooks.Messages"/*#Frozen*/);
/*
Logger to log transaction messages
*/
static Logger _logger = LogDomains.getLogger(FailureInducer.class, LogDomains.TRANSACTION_LOGGER);
// static initializer
static {
}
// static methods
/**
* This activates the FailureInducer. An application needs to activate
* the failure inducer first, before setting the fail or wait points.
*/
public static void activateFailureInducer() {
failureInducerIsActive = true;
}
/**
* This deactivates the FailureInducer. An application deactivate the
* failure inducer, to temporarily stop failure inducement. The fail
* or wait points are not forgotten during the dormant state.
*/
public static void deactivateFailureInducer() {
failureInducerIsActive = false;
}
/**
* @return the current state (active or inactive) of failure inducer.
*/
public static boolean isFailureInducerActive() {
return failureInducerIsActive;
}
/**
* Setting a crash point will cause the TM to wait at the
* failure point, until crash() is called.
*
* @param crashPoint pre-defined failure points
* (PREPARING, PREPARED, COMMITTING, COMMITTED).
*/
public static void setCrashPoint(Integer crashPoint) {
// sanity check
if (crashPoint == null) {
_logger.log(Level.SEVERE,"jts.invalid_crash_point");
return;
}
GlobalTID gtid = getGlobalTID();
if (gtid != null) {
crashList.put(gtid, crashPoint);
}
}
/**
* Setting a wait point will cause the TM to wait at the
* failure point, for the stipulated wait duration.
*
* @param crashPoint pre-defined failure points
* (PREPARING, PREPARED, COMMITTING, COMMITTED).
* @param waitDuration time duration (seconds) for RM failure to happen.
*/
public static void setWaitPoint(Integer waitPoint, int waitDuration) {
// sanity check
if (waitPoint == null) {
_logger.log(Level.SEVERE,"jts.invalid_wait_point");
return;
}
GlobalTID gtid = getGlobalTID();
if (gtid != null) {
waitList.put(gtid, waitPoint);
waitTime.put(gtid, waitDuration);
}
}
/**
* Forces the TM to crash.
*/
public static void crash() {
crash = true;
}
/**
* Increments the wait count (called only by TM).
*/
private static void incrementWaitCount() {
waitCount++;
}
/**
* @return the total number of failure points reached.
*/
public static int getWaitCount() {
return waitCount;
}
/**
* This method is called by the coordinator at every valid
* failure point. If the crash point or the wait point set for
* the current transaction matches the current failure point,
* an appropriate action (crash or wait) is taken.
* Note: Crash action takes precedence over wait actions for the
* same failure point.
*
* @param coord the coordinator object (which represents the transaction.
* @param failPoint indicates the current failure point in coordinator code.
*/
public static void waitForFailure(GlobalTID gtid, Integer failPoint) {
// sanity check
if (gtid == null)
return;
Integer crashPoint = (Integer) crashList.get(gtid);
Integer waitPoint = (Integer) waitList.get(gtid);
// no crash point or wait point has been set for the transaction
if (crashPoint == null && waitPoint == null) {
return;
}
_logger.log(Level.WARNING,"jts.failpoint",failPoint);
// increment wait count and wait for the crash flag to be set
if (crashPoint != null && crashPoint.equals(failPoint)) {
incrementWaitCount();
while (crash == false) {
try {
Thread.sleep(3000);
} catch (Exception e) {}
}
System.exit(0);
}
// wait for the wait duration and continue
if (waitPoint != null && waitPoint.equals(failPoint)) {
Integer waitDuration = (Integer) waitTime.get(gtid);
// wait duration has not be set or is invalid
if (waitDuration == null || waitDuration.intValue() < 0)
return;
// wait for the stipulated duration
try {
Thread.sleep(waitDuration.intValue() * 1000L);
} catch (Exception e) {}
}
}
/**
* Enable wait action dyring delegated recovery via "add-wait-point-during-recovery"
* property added to the transaction-service config
*/
public static void setWaitPointRecovery(int waitDuration) {
recoveryWaitDuration = waitDuration;
}
/**
* Perform wait action dyring delegated recovery
*/
public static void waitInRecovery() {
if (recoveryWaitDuration > 0) {
_logger.log(Level.WARNING,"jts.failpoint", "RECOVERY");
// wait for the stipulated duration
try {
Thread.sleep(recoveryWaitDuration * 1000L);
} catch (Exception e) {}
}
}
private static GlobalTID getGlobalTID() {
GlobalTID gtid = null;
Coordinator coord = Utility.getCoordinator(Utility.getControl());
JCoordinator jcoord = JCoordinatorHelper.narrow(coord);
if (jcoord != null) {
gtid = new GlobalTID(jcoord.getGlobalTID());
} else {
ControlImpl control = CurrentTransaction.getCurrent();
if (control != null) {
gtid = control.getGlobalTID();
}
}
return gtid;
}
}