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author | Egil Moeller <egil.moller@freecode.no> | 2010-03-21 23:33:06 +0100 |
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committer | Egil Moeller <egil.moller@freecode.no> | 2010-03-21 23:33:06 +0100 |
commit | d56b9b3b82cdebcaeb00eec0fcb4326ad21adaa8 (patch) | |
tree | b1dfe31956f3fc86e3408f1efac5e12acf65b11a /infrastructure/net.appjet.oui/synchronizer.scala | |
parent | c1894c8e0a52f4e3d2f89fa92f0066bbf0fcf1b1 (diff) | |
parent | 103d4926ae6c61824dc0b48be7bf66f08830ed47 (diff) | |
download | etherpad-d56b9b3b82cdebcaeb00eec0fcb4326ad21adaa8.tar.gz etherpad-d56b9b3b82cdebcaeb00eec0fcb4326ad21adaa8.tar.bz2 etherpad-d56b9b3b82cdebcaeb00eec0fcb4326ad21adaa8.zip |
Merge branch 'master' of git@github.com:ether/pad
Diffstat (limited to 'infrastructure/net.appjet.oui/synchronizer.scala')
-rw-r--r-- | infrastructure/net.appjet.oui/synchronizer.scala | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/infrastructure/net.appjet.oui/synchronizer.scala b/infrastructure/net.appjet.oui/synchronizer.scala new file mode 100644 index 0000000..2a6d9c1 --- /dev/null +++ b/infrastructure/net.appjet.oui/synchronizer.scala @@ -0,0 +1,69 @@ +/** + * 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. + */ + +package net.appjet.oui; + +class Synchronizer { + import java.util.concurrent.locks.ReentrantLock; + import java.util.concurrent.ConcurrentHashMap; + + private val lockMap = new ConcurrentHashMap[Object, Lock]; + private val monitor = new Object {}; + + private class Lock { + var users = 0; + val impl = new ReentrantLock; + } + + def acquire(key: Object) { + val lock = monitor.synchronized { + var lck = lockMap.get(key); + if (lck == null) { + lck = new Lock; + lockMap.put(key, lck); + } + lck.users += 1; + lck; + } + lock.impl.lock(); + } + + def isHeld(key: Object): Boolean = { + monitor.synchronized { + val lck = lockMap.get(key); + if (lck == null) { + false; + } + else { + lck.impl.isLocked; + } + } + } + + def release(key: Object) { + val lock = monitor.synchronized { + var lck = lockMap.get(key); + lck.users -= 1; + if (lck.users == 0) { + lockMap.remove(key); + } + lck; + } + lock.impl.unlock(); + } +} + +object GlobalSynchronizer extends Synchronizer; |