the object pool caches objects that are too expensive to create or need to be repeatedly created and used. The time to fetch an object from the pool is predictable, but the time to create a new object
用不带factory参数的构造方法构造的StackObjectPool实例,必须要在用它的setFactory(PoolableObjectFactory factory)方法与某一PoolableObjectFactory实例关联起来后才能正常使用。 这种对象池可以在没有Jakarta Commmons Collections组件支持的情况下正常运行。 SoftReferenceObjectPool: ObjectPool implementation with a LIFO (Las...
public ObjectPool createPool(ParameterObject paraObj,Class clsType) { return new ObjectPool(paraObj, clsType); } . . . 其中,paraObj参数用于指定对象池的特征属性,clsType参数则指定了该对象池所存放对象的类型。对象池(ObjectPool)创建以后,下面就是利用它来管理对象了,具体实现如下: public class Object...
// any ObjectPool implementation will suffice. // ObjectPool<PoolableConnection> connectionPool = new GenericObjectPool<>(poolableConnectionFactory); // Set the factory's pool property to the owning pool poolableConnectionFactory.setPool(connectionPool); // // Finally, we create the PoolingDriver...
调用Object.wait() 方法使线程进入限期等待或者无限期等待时,常常用“挂起一个线程”进行描述。 睡眠和挂起是用来描述行为,而阻塞和等待用来描述状态。 阻塞和等待的区别在于,阻塞是被动的,它是在等待获取一个排它锁。而等待是主动的,通过调用 Thread.sleep() 和 Object.wait() 等方法进入。
public V put(K key, V value) { return putVal(key, value, false); } /** Implementation for put and putIfAbsent */ final V putVal(K key, V value, boolean onlyIfAbsent) { if (key == null || value == null) thrownew NullPointerException(); int hash = spread(key.hashCode()); /...
1. Missing run() Method Implementation Problem: A common mistake is forgetting to implement the run() method when creating a class that implements the runnable interface. Since the runnable interface mandates the run() method, failing to implement it will result in a compile-time error. ...
实现(implementation):黑盒的内部实现,比如子程序的实现代码。不可变对象(immutable object):不可变对象构造完成后不能改变,因为实例中所有变量都标记为 final。无限循环(infinite loop):循环永远不会结束,因为它的循环条件永远判定为 true。继承(inheritence):一个类可以继承另一个类。继承者会从父类继承数据和行为。
清单1. Active Object方法调用示例 AI检测代码解析 ActiveObject ao=...; Futurefuture = ao.doSomething("data"); //执行其它操作 String result = future.get(); System.out.println(result); 1. 2. 3. 4. 5. Active Object模式的架构 当Active Object模式对外暴露的异步方法被调用时,与该方法调用相关...
/*** An object that creates new threads on demand. Using thread factories* removes hardwiring of calls to {@link Thread#Thread(Runnable) new Thread},* enabling applications to use special thread subclasses, priorities, etc.** <p>* The simplest implementation of this interface is just:* <pre...