StackOverflow2013

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PO
primarykey
Id
19087933
data
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0
AnswerCount
0
ClosedDate
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0
CommunityOwnedDate
CreationDate
2013-09-30T06:43:56.023
FavoriteCount
0
LastActivityDate
2013-10-10T11:41:40.947
LastEditDate
2013-10-10T11:41:40.947
LastEditorUserId
62829
OwnerUserId
1631379
ParentId
574240
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
Often using a lock on a method level is too rude. Why lock up a piece of code that does not access any shared resources by locking up an entire method. Since each object has a lock, you can create dummy objects to implement block level synchronization. The block level is more efficient because it does not lock the whole method. Here some example Method Level <pre><code>class MethodLevel { //shared among threads SharedResource x, y ; public void synchronized method1() { //multiple threads can't access } public void synchronized method2() { //multiple threads can't access } public void method3() { //not synchronized //multiple threads can access } } </code></pre> Block Level <pre><code>class BlockLevel { //shared among threads SharedResource x, y ; //dummy objects for locking Object xLock = new Object(); Object yLock = new Object(); public void method1() { synchronized(xLock){ //access x here. thread safe } //do something here but don't use SharedResource x, y // because will not be thread-safe synchronized(xLock) { synchronized(yLock) { //access x,y here. thread safe } } //do something here but don't use SharedResource x, y //because will not be thread-safe }//end of method1 } </code></pre> [Edit] For <code>Collection</code> like <code>Vector</code> and <code>Hashtable</code> they are synchronized when <code>ArrayList</code> or <code>HashMap</code> are not and you need set synchronized keyword or invoke Collections synchronized method: <pre><code>Map myMap = Collections.synchronizedMap (myMap); // single lock for the entire map List myList = Collections.synchronizedList (myList); // single lock for the entire list </code></pre>
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1. POIs there an advantage to use a Synchronized Method instead of a Synchronized Block?
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1. PTAnswer
UserLastEditorUserId
1. USmattmanser
UserOwnerUserId
1. USMaxim Shoustin
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