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The keyword {{synchronized}} is known to make sure the synchronization of threads within a process in Java. However, care should be taken when writing a thread-safe class to defend itself from possible denial-of-service attack
\[[Effective Java, Item 52|http://books.google.com/books?id=ZZOiqZQIbRMC&pg=PA210&lpg=PA210&dq=private+lock+object+idiom&source=bl&ots=UZP26thN4-&sig=QCPUutihieMlD8cNJIwPLpvBCXc&hl=en&ei=RJPzSsG0EJXilAezjuWjAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAgQ6AEwAA#v=onepage&q=private%20lock%20object%20idiom&f=false]\]. |
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// private lock object idiom - thawts denial-of-service attack
class importantObj {
private final Object lock = new Object();
public void changeValue() { // lock on this
synchronized(lock) {
...
}
}
...
}
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\[[Effective Java, Item 52|http://books.google.com/books?id=ZZOiqZQIbRMC&pg=PA210&lpg=PA210&dq=private+lock+object+idiom&source=bl&ots=UZP26thN4-&sig=QCPUutihieMlD8cNJIwPLpvBCXc&hl=en&ei=RJPzSsG0EJXilAezjuWjAw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAgQ6AEwAA#v=onepage&q=private%20lock%20object%20idiom&f=false]\] |