@Override
@SuppressWarnings({"unchecked"})
public int getOrCreate(long o) {
if (DependencyTracker.isBypassCaches()) {
return calculatable.calculate(owner, o);
} else {
preCheckDirty();
lock(o);
try {
Object v = load(o);
ExceptionHelper.throwIfExceptionRecordNotExpired(v);
if (v != UNDEFINED) {
DependencyTracker.mark(getDependencyNode());
hit();
return (Integer) v;
}
DependencyNode callerNode = DependencyTracker.track(getDependencyNode());
try {
while (true) {
try {
return create(o);
} catch (ResourceOccupied e) {
if (callerNode != null) {
throw e;
} else {
unlock(o);
try {
e.getResource().waitForEndOfModification();
} finally {
lock(o);
}
v = load(o);
ExceptionHelper.throwIfExceptionRecordNotExpired(v);
if (v != UNDEFINED) {
hit();
return (Integer) v;
}
}
}
}
} finally {
DependencyTracker.exit(callerNode);
}
} finally {
unlock(o);
postCheckDirty();
}
}
}
@SuppressWarnings({"unchecked"})
protected int create(long o) {
long start = System.nanoTime();
try {
int retry = 0;
// retry on exception loop
while (true) {
try {
int t = calculatable.calculate(owner, o);
// successful invocation => just store the value and return
save(o, t);
return t;
} catch (Exception e) {
// We catch Exception here, but not Error and not Throwable.
// this is because in case of Error we are likely have no chance even to save
// an ExceptionRecord to a storage, so don't even try to do so.
// For example in case of OOM (out of memory) it may be impossible to create
// even a single new object.
CacheExceptionHandler exceptionHandler = getDescriptor().getExceptionHandler();
switch (exceptionHandler.getAction(retry, e)) {
case RETRY:
retry++;
continue;
case REMEMBER_AND_RETHROW:
save(
o,
new ExceptionRecord(
e, exceptionHandler.getRememberExceptionExpirationTimestamp(e)));
// fall through
case RETHROW:
default:
// this method always throws an exception
ExceptionHelper.throwCheckedExceptionHack(e);
break;
}
}
}
} finally {
// record calculation time even if calculation fails
long end = System.nanoTime();
miss(end - start);
}
}