Example usage for org.apache.commons.pool.impl GenericKeyedObjectPool evict

Introduction

In this page you can find the example usage for org.apache.commons.pool.impl GenericKeyedObjectPool evict.

Prototype

public void evict() throws Exception 

Source Link

Document

Perform numTests idle object eviction tests, evicting examined objects that meet the criteria for eviction.

Usage

From source file:edu.illinois.enforcemop.examples.apache.pool.TestGenericKeyedObjectPool.java

private void checkEvictionOrder(boolean lifo) throws Exception {
    SimpleFactory factory = new SimpleFactory();
    GenericKeyedObjectPool pool = new GenericKeyedObjectPool(factory);
    pool.setNumTestsPerEvictionRun(2);//from  w w w .  ja  va  2s . c o  m
    pool.setMinEvictableIdleTimeMillis(100);
    pool.setLifo(lifo);

    for (int i = 0; i < 3; i++) {
        Integer key = new Integer(i);
        for (int j = 0; j < 5; j++) {
            pool.addObject(key);
        }
    }

    // Make all evictable
    Thread.sleep(200);

    /* 
     * Initial state (Key, Object) pairs in order of age:
     * 
     * (0,0), (0,1), (0,2), (0,3), (0,4)
     * (1,5), (1,6), (1,7), (1,8), (1,9)
     * (2,10), (2,11), (2,12), (2,13), (2,14)
     */

    pool.evict(); // Kill (0,0),(0,1)
    assertEquals(3, pool.getNumIdle(zero));
    Object obj = pool.borrowObject(zero);
    assertTrue(lifo ? obj.equals("04") : obj.equals("02"));
    assertEquals(2, pool.getNumIdle(zero));
    obj = pool.borrowObject(zero);
    assertTrue(obj.equals("03"));
    assertEquals(1, pool.getNumIdle(zero));

    pool.evict(); // Kill remaining 0 survivor and (1,5)
    assertEquals(0, pool.getNumIdle(zero));
    assertEquals(4, pool.getNumIdle(one));
    obj = pool.borrowObject(one);
    assertTrue(lifo ? obj.equals("19") : obj.equals("16"));
    assertEquals(3, pool.getNumIdle(one));
    obj = pool.borrowObject(one);
    assertTrue(lifo ? obj.equals("18") : obj.equals("17"));
    assertEquals(2, pool.getNumIdle(one));

    pool.evict(); // Kill remaining 1 survivors
    assertEquals(0, pool.getNumIdle(one));
    pool.evict(); // Kill (2,10), (2,11)
    assertEquals(3, pool.getNumIdle(two));
    obj = pool.borrowObject(two);
    assertTrue(lifo ? obj.equals("214") : obj.equals("212"));
    assertEquals(2, pool.getNumIdle(two));
    pool.evict(); // All dead now
    assertEquals(0, pool.getNumIdle(two));

    pool.evict(); // Should do nothing - make sure no exception
    pool.evict();

    // Reload
    pool.setMinEvictableIdleTimeMillis(500);
    factory.counter = 0; // Reset counter
    for (int i = 0; i < 3; i++) {
        Integer key = new Integer(i);
        for (int j = 0; j < 5; j++) {
            pool.addObject(key);
        }
        Thread.sleep(200);
    }

    // 0's are evictable, others not 
    pool.evict(); // Kill (0,0),(0,1)
    assertEquals(3, pool.getNumIdle(zero));
    pool.evict(); // Kill (0,2),(0,3)
    assertEquals(1, pool.getNumIdle(zero));
    pool.evict(); // Kill (0,4), leave (1,5)
    assertEquals(0, pool.getNumIdle(zero));
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    pool.evict(); // (1,6), (1,7)
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    pool.evict(); // (1,8), (1,9)
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    pool.evict(); // (2,10), (2,11)
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    pool.evict(); // (2,12), (2,13)
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    pool.evict(); // (2,14), (1,5)
    assertEquals(5, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    Thread.sleep(200); // Ones now timed out
    pool.evict(); // kill (1,6), (1,7) - (1,5) missed
    assertEquals(3, pool.getNumIdle(one));
    assertEquals(5, pool.getNumIdle(two));
    obj = pool.borrowObject(one);
    assertTrue(lifo ? obj.equals("19") : obj.equals("15"));
}

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