In his talk about Effective Java at 54:15 Joshua Bloch recommends to use get before putIfAbsent in order to improve performance and concurrency. This leads me to the question why this optimization is
This question already has answers here: Closed 10 years ago. Possible Duplicate: 开发者_运维百科When should I use ConcurrentSkipListMap?
A lot of 开发者_JAVA百科disk activity while I warm my cache up. I can\'t determine if the org.apache.lucene ConcurrentLRUCache is doing it or not? (The class in questionuses the Java ConcurrentHashMap
I was given a code, it creates a unique id based on the user name and the service type. The unique id is in db , db is read via DAO classes which i cant see. it takes lot of steps to create the id.
I have a class teleport by using RMI.But I am not sure those thread-safe object can be serialized.Does anyone tried before?
I have a multi-threade开发者_如何转开发d Java application where a method [update(key, value)] updates a ConcurrentHashMap. For each key there will be more values received than can be put in the map an
If i was using a concurrent hashmap and i had methods which set and got values, as im using a concurrent hashmap would i need to make the getter and setter synchronized? Is this redundant? Is one desi
I\'ve read through Java Concurrency in Practice and am left with this question:when I use a ConcurrentHashMap, what data concurrency issues discussed in Part One of the book do I still need to worry a
How do you perform a safe get if present operation on a Concurrent Hash Map? (same thing like putIfAbsent)
I have been using Java\'s ConcurrentMap for a map that can be used from multiple threads. The putIfAbsent is a great method and is much easier to read/write than using standard map operations. I have
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