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author | Alexander Sulfrian <alexander@sulfrian.net> | 2010-06-08 08:22:05 +0200 |
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committer | Alexander Sulfrian <alexander@sulfrian.net> | 2010-06-08 08:22:05 +0200 |
commit | d7c5ad7d6263fd1baf9bfdbaa4c50b70ef2fbdb2 (patch) | |
tree | ae0b65da6432f4c26c8d5a7319efbda5d172846c /trunk/infrastructure/framework-src/modules/sync.js | |
parent | fa61221dcd89fcd72cba2c97971626f456c86e5d (diff) | |
download | etherpad-d7c5ad7d6263fd1baf9bfdbaa4c50b70ef2fbdb2.tar.gz etherpad-d7c5ad7d6263fd1baf9bfdbaa4c50b70ef2fbdb2.tar.xz etherpad-d7c5ad7d6263fd1baf9bfdbaa4c50b70ef2fbdb2.zip |
reverted folder structure change for better mergeing with upstream
Diffstat (limited to 'trunk/infrastructure/framework-src/modules/sync.js')
-rw-r--r-- | trunk/infrastructure/framework-src/modules/sync.js | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/trunk/infrastructure/framework-src/modules/sync.js b/trunk/infrastructure/framework-src/modules/sync.js new file mode 100644 index 0000000..a222ea0 --- /dev/null +++ b/trunk/infrastructure/framework-src/modules/sync.js @@ -0,0 +1,81 @@ +/** + * 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); + } +} + |