commons-pool

PoolTest.java

import org.apache.commons.pool2.PoolableObjectFactory;
import org.apache.commons.pool2.impl.GenericObjectPool;

public class PoolTest {

	public static void main(String[] args) throws Exception {
		GenericObjectPool<PooledObject> pool = new GenericObjectPool<PoolTest.PooledObject>(
				new F());
		pool.addObject();
		pool.addObject();
		System.out.println("======");
		PooledObject p1 = pool.borrowObject();
		PooledObject p2 = pool.borrowObject();
		System.out.println(p1);
		System.out.println(p2);
		pool.returnObject(p1);
		pool.returnObject(p2);

		pool.close();
	}

	static class PooledObject {
		public PooledObject() {
			System.out.println("created");
		}

		void close() {
			System.out.println("closed");
		}
	}

	static class F implements PoolableObjectFactory<PooledObject> {

		@Override
		public PooledObject makeObject() throws Exception {
			return new PooledObject();
		}

		@Override
		public void destroyObject(PooledObject obj) throws Exception {
			obj.close();
		}

		@Override
		public boolean validateObject(PooledObject obj) {
			System.out.println("validateObject");
			return true;
		}

		@Override
		public void activateObject(PooledObject obj) throws Exception {
			System.out.println("activate");
		}

		@Override
		public void passivateObject(PooledObject obj) throws Exception {
			System.out.println("passive");
		}
	}
}