object-pooling

问题 I am building a UDP-based application that receives and sends multiple packets. I could build a new DatagramPacket for each send, or I recycle one instance for the life of my application. Are there any advantages to reusing a DatagramPacket ? (e.g. memory-allocation) Are there any potential problems? (e.g. thread-safety) 回答1: It looks like you can't. I just tried sending the same DatagramPacket twice and I get the following behavior: The packet is sent only once Netty logs the warning below

问题 How would I write a generic InternPool<T> in Java? Does it need a Internable interface? String in Java has interning capabilities; I want to intern classes like BigDecimal and Account . 回答1: Something like this: public class InternPool<T> { private WeakHashMap<T, WeakReference<T>> pool = new WeakHashMap<T, WeakReference<T>>(); public synchronized T intern(T object) { T res = null; // (The loop is needed to deal with race // conditions where the GC runs while we are // accessing the 'pool' map

问题 I have one couchdb database and I am querying it in parallel. Now, I want to create a connection pool, because I discovered a bottleneck in my design - I was using a single instance of couchd , so parallelization was failing due to that. I searched the web for connection pool implementations, but I was not able to find a proper java connection pool implementation for couchdb - most of the frameworks support relational databases. I will be appreciated if someone can help me for that. 回答1: I've

问题 I have my first runner game. Everything works fine. So, this question is about optimisation. In my game, There are 15 platforms(road prefabs on which player runs). Randomly out 15 any 1 is instantiated and this keeps happening. When player passes a few platforms, The left behind platforms gets destroyed. I made a list to keep track of platforms and delete them last platform prefab ( list[0]). And new ones are instantiated ahead. As the game approaches, It gets fast which means the operation

问题 It's my understanding that in Spring, all objects are treated by default as singletons. If singleton is set to false, then a new object will be served at each request. But what if I wanted to pool objects? Say set a range from a min of 1 to a max of 10 instances? Is this possible using Spring? 回答1: Pooling can be applied to any POJO with spring. See here for more information. 来源： https://stackoverflow.com/questions/893041/how-does-one-manage-object-pooling-in-spring

问题 What is object pooling and what is a weak object reference ? How can we implement them using Java? 回答1: An object pool is a collection of a particular object that an application will create and keep on hand for those situations where creating each instance is expensive. A good example would be a database connection or a worker thread. The pool checks instances in and out for users like books out of a library. Usually object pooling is handled by a Java EE application server. If you need to do

问题 Is it possible to create a generic object pool that creates new objects inside it? Plus it would be nice if this object creation could receive parameters. public interface IPoolable { void Dispose(); } public class ObjectPool<T> where T : IPoolable { private List<T> pool; public T Get() { if(pool.count > 0) { return pool.Pop(); } else { return new T(); // <- How to do this properly? } } } public class SomeClass : IPoolable { int id; public SomeClass(int id) { this.id = id; } public void

问题 I'm on a webservice server and I have objects with an internal connection. Initializing this connection takes really long so my idea was to use an object pool to reuse the connections among different requests. The objects are connected to each user, so i prefer to use the username as key and the connection as value. But I don't want to have the connection open forever. Maybe after a while it should be destroyed if the user does not start requests any more. I thought about using the apache

问题 I need to create a pool of socket connections which will be served to multiple worker threads. Is there a thread safe object pool implementation with functionality similar to Apache Commons' GenericObjectPool ? 回答1: Check out boost.flyweight. 回答2: I usually use TBB to implement thread-safe scalable pools. template <typename T> class object_pool { std::shared_ptr<tbb::concurrent_bounded_queue<std::shared_ptr<T>>> pool_; public: object_pool() : pool_(new tbb::concurrent_bounded_queue<std:

问题 We use a number of large objects. Ideally, we'd like to make all of them permanently available to client code, but they don't fit in physical memory all at once. So when we approach memory limits, we'll need to destroy some of the objects in pool (probably, we'll destroy the least-recently-used object). (Using virtual memory on disk is tantamount to a complete system freeze.) For concreteness, the memory per object varies between ~100MB and ~10GB; the total amount of RAM we have is 32GB.