Java OSMXBean.getOpenFileDescriptorCount方法代码示例

import org.apache.zookeeper.server.util.OSMXBean; //导入方法依赖的package包/类
@Before
public void setUp() throws Exception {
    /* some useful information - log the number of fds used before
     * and after a test is run. Helps to verify we are freeing resources
     * correctly. Unfortunately this only works on unix systems (the
     * only place sun has implemented as part of the mgmt bean api.
     */
    OSMXBean osMbean = new OSMXBean();
    if (osMbean.getUnix() == true) {
        initialFdCount = osMbean.getOpenFileDescriptorCount();  	
        LOG.info("Initial fdcount is: "
                + initialFdCount);
    }

    setupTestEnv();

    JMXEnv.setUp();

    setUpAll();

    tmpDir = createTmpDir(BASETEST);

    startServer();

    LOG.info("Client test setup finished");
}
 

import org.apache.zookeeper.server.util.OSMXBean; //导入方法依赖的package包/类
@Before
public void setUp() throws Exception {
    /* some useful information - log the number of fds used before
     * and after a test is run. Helps to verify we are freeing resources
     * correctly. Unfortunately this only works on unix systems (the
     * only place sun has implemented as part of the mgmt bean api.
     */
    OSMXBean osMbean = new OSMXBean();
    if (osMbean.getUnix() == true) {
        initialFdCount = osMbean.getOpenFileDescriptorCount();  	
        LOG.info("Initial fdcount is: "
                + initialFdCount);
    }

    setupTestEnv();

    JMXEnv.setUp();

    setUpAll();

    tmpDir = createTmpDir(BASETEST, true);

    startServer();

    LOG.info("Client test setup finished");
}
 

import org.apache.zookeeper.server.util.OSMXBean; //导入方法依赖的package包/类
@After
public void tearDown() throws Exception {
    LOG.info("tearDown starting");

    tearDownAll();

    stopServer();

    if (tmpDir != null) {
        Assert.assertTrue("delete " + tmpDir.toString(), recursiveDelete(tmpDir));
    }

    // This has to be set to null when the same instance of this class is reused between test cases
    serverFactory = null;

    JMXEnv.tearDown();

    /* some useful information - log the number of fds used before
     * and after a test is run. Helps to verify we are freeing resources
     * correctly. Unfortunately this only works on unix systems (the
     * only place sun has implemented as part of the mgmt bean api.
     */
    OSMXBean osMbean = new OSMXBean();
    if (osMbean.getUnix() == true) {
        long fdCount = osMbean.getOpenFileDescriptorCount();     
        String message = "fdcount after test is: "
                + fdCount + " at start it was " + initialFdCount;
        LOG.info(message);
        if (fdCount > initialFdCount) {
            LOG.info("sleeping for 20 secs");
            //Thread.sleep(60000);
            //assertTrue(message, fdCount <= initialFdCount);
        }
    }
}
 

import org.apache.zookeeper.server.util.OSMXBean; //导入方法依赖的package包/类
@Test
public void testFileDescriptorLeak() throws Exception {

    OSMXBean osMbean = new OSMXBean();
    if (osMbean.getUnix() != true) {
        LOG.info("Unable to run test on non-unix system");
        return;
    }

    long startFdCount = osMbean.getOpenFileDescriptorCount();
    LOG.info("Start fdcount is: " + startFdCount);

    for (int i = 0; i < 50; ++i) {
        NIOServerCnxnFactory factory = new NIOServerCnxnFactory();
        factory.configure(
            new InetSocketAddress(
                "127.0.0.1", PortAssignment.unique()), 10);
        factory.start();
        Thread.sleep(100);
        factory.shutdown();
    }

    long endFdCount = osMbean.getOpenFileDescriptorCount();
    LOG.info("End fdcount is: " + endFdCount);

    // On my box, if selector.close() is not called fd diff is > 700.
    Assert.assertTrue("Possible fd leakage",
            ((endFdCount - startFdCount) < 50));
}
 

import org.apache.zookeeper.server.util.OSMXBean; //导入方法依赖的package包/类
/**
 * Verify that the client is cleaning up properly. Open/close a large
 * number of sessions. Essentially looking to see if sockets/selectors
 * are being cleaned up properly during close.
 *
 * @throws Throwable
 */
@Test
public void testClientCleanup() throws Throwable {
    OSMXBean osMbean = new OSMXBean();
    if (osMbean.getUnix() == false) {
        LOG.warn("skipping testClientCleanup, only available on Unix");
        return;
    }

    final int threadCount = 3;
    final int clientCount = 10;

    /* Log the number of fds used before and after a test is run. Verifies
     * we are freeing resources correctly. Unfortunately this only works
     * on unix systems (the only place sun has implemented as part of the
     * mgmt bean api).
     */
    long initialFdCount = osMbean.getOpenFileDescriptorCount();

    VerifyClientCleanup threads[] = new VerifyClientCleanup[threadCount];

    for (int i = 0; i < threads.length; i++) {
        threads[i] = new VerifyClientCleanup("VCC" + i, clientCount);
        threads[i].start();
    }

    for (int i = 0; i < threads.length; i++) {
        threads[i].join(CONNECTION_TIMEOUT);
        Assert.assertTrue(threads[i].current == threads[i].count);
    }

    // if this Assert.fails it means we are not cleaning up after the closed
    // sessions.
    long currentCount = osMbean.getOpenFileDescriptorCount();
    final String logmsg = "open fds after test ({}) are not significantly higher than before ({})";
    
    if (currentCount > initialFdCount + 10) {
        // consider as error
    	LOG.error(logmsg,Long.valueOf(currentCount),Long.valueOf(initialFdCount));
    } else {
    	LOG.info(logmsg,Long.valueOf(currentCount),Long.valueOf(initialFdCount));
    }
}