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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
jimport("java.util.concurrent.locks.ReentrantLock");
jimport("net.appjet.oui.GlobalSynchronizer");
/**
* synchronously calls a no-argument function.
* f may have return values.
*/
function callsync(obj, f) {
if (!obj._LOCK) {
try {
appjet.globalLock.lock();
if (! obj._LOCK) {
obj._LOCK = new ReentrantLock();
}
} finally {
appjet.globalLock.unlock();
}
}
try {
obj._LOCK.lock();
return f();
} finally {
obj._LOCK.unlock();
}
}
/**
* synchronously calls a no-argument function iff
* condition() is true. condition may be called
* twice and shouldn't have side-effects.
*/
function callsyncIfTrue(obj, condition, f) {
if (condition()) {
callsync(obj, function() {
if (condition()) {
f();
}
});
}
}
/**
* returns a function that synchronously calls
* f with its own arguments
*/
function wrapsync(obj, f, thisArg) {
return function() {
var args = Array.prototype.slice.call(arguments);
var wrapper = function() {
return f.apply(thisArg, args);
}
callsync(obj, wrapper);
}
}
function doWithStringLock(lockName, fn) {
GlobalSynchronizer.acquire(lockName);
try {
return fn();
}
finally {
GlobalSynchronizer.release(lockName);
}
}
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