Examples with OakDiscoveryService org.apache.sling.discovery.oak.OakDiscoveryService used on opensource projects

Example 1 with OakDiscoveryService

use of org.apache.sling.discovery.oak.OakDiscoveryService in project sling by apache.

the class OakDiscoveryServiceTest method testOldView.

/**
     * Tests whether the not-current view returned by getTopology()
     * matches what listeners get in TOPOLOGY_CHANGING - it should
     * basically be the same.
     */
@Test
public void testOldView() throws Throwable {
    final org.apache.log4j.Logger discoveryLogger = RootLogger.getLogger("org.apache.sling.discovery");
    // info should do
    discoveryLogger.setLevel(Level.INFO);
    OakVirtualInstanceBuilder builder = newBuilder();
    builder.setDebugName("firstInstanceA").newRepository("/var/discovery/oak/", true).setConnectorPingTimeout(3).setMinEventDelay(3);
    instance1 = builder.build();
    instance1.stopViewChecker();
    //        instance1.stopVoting();
    TopologyView t1 = instance1.getDiscoveryService().getTopology();
    // current it should not be
    assertFalse(t1.isCurrent());
    // but it can as well contain the local instance
    assertEquals(1, t1.getInstances().size());
    AssertingTopologyEventListener l1 = new AssertingTopologyEventListener("instance1.l1");
    l1.addExpected(Type.TOPOLOGY_INIT);
    instance1.bindTopologyEventListener(l1);
    logger.info("testOldView: instance1 created, no events expected yet. slingId=" + instance1.slingId);
    instance1.heartbeatsAndCheckView();
    Thread.sleep(200);
    instance1.heartbeatsAndCheckView();
    Thread.sleep(200);
    instance1.heartbeatsAndCheckView();
    Thread.sleep(200);
    logger.info("testOldView: 2nd/3rd heartbeat sent - now expecting a TOPOLOGY_INIT");
    instance1.dumpRepo();
    // one event
    assertEquals(1, l1.getEvents().size());
    // the expected one
    assertEquals(0, l1.getRemainingExpectedCount());
    assertEquals(0, l1.getUnexpectedCount());
    t1 = instance1.getDiscoveryService().getTopology();
    // current it should now be
    assertTrue(t1.isCurrent());
    // and it must contain the local instance
    assertEquals(1, t1.getInstances().size());
    logger.info("testOldView: creating instance2");
    builder.getSimulatedLeaseCollection().setFinal(false);
    l1.addExpected(Type.TOPOLOGY_CHANGING);
    VirtualInstanceBuilder builder2 = newBuilder();
    builder2.setDebugName("secondInstanceB").useRepositoryOf(instance1).setConnectorPingTimeout(3).setMinEventDelay(3);
    instance2 = builder2.build();
    instance2.stopViewChecker();
    //        instance2.stopVoting();
    logger.info("testOldView: instance2 created, now issuing one heartbeat with instance2 first, so that instance1 can take note of it");
    instance2.getViewChecker().checkView();
    OakDiscoveryService oakDisco1 = (OakDiscoveryService) instance2.getDiscoveryService();
    oakDisco1.checkForTopologyChange();
    logger.info("testOldView: now instance1 is also doing a heartbeat and should see that a new instance is there");
    instance1.getViewChecker().checkView();
    OakDiscoveryService oakDisco2 = (OakDiscoveryService) instance1.getDiscoveryService();
    oakDisco2.checkForTopologyChange();
    logger.info("testOldView: 500ms sleep...");
    // allow some time for CHANGING to be sent
    Thread.sleep(500);
    logger.info("testOldView: 500ms sleep done.");
    // INIT and CHANGING
    assertEquals(2, l1.getEvents().size());
    // no remaining expected
    assertEquals(0, l1.getRemainingExpectedCount());
    // and no unexpected
    assertEquals(0, l1.getUnexpectedCount());
    t1 = instance1.getDiscoveryService().getTopology();
    // current it should not be
    assertFalse(t1.isCurrent());
    // but it should still contain the local instance from before
    assertEquals(1, t1.getInstances().size());
    builder.getSimulatedLeaseCollection().setFinal(true);
    l1.addExpected(Type.TOPOLOGY_CHANGED);
    logger.info("testOldView: now issuing 3 rounds of heartbeats/checks and expecting a TOPOLOGY_CHANGED then");
    instance2.heartbeatsAndCheckView();
    //        instance2.analyzeVotings();
    instance1.heartbeatsAndCheckView();
    //        instance1.analyzeVotings();
    Thread.sleep(1200);
    instance2.heartbeatsAndCheckView();
    instance1.heartbeatsAndCheckView();
    Thread.sleep(1200);
    instance2.heartbeatsAndCheckView();
    instance1.heartbeatsAndCheckView();
    Thread.sleep(1200);
    // INIT, CHANGING and CHANGED
    assertEquals(3, l1.getEvents().size());
    // no remaining expected
    assertEquals(0, l1.getRemainingExpectedCount());
    // and no unexpected
    assertEquals(0, l1.getUnexpectedCount());
    t1 = instance1.getDiscoveryService().getTopology();
    // and we should be current again
    assertTrue(t1.isCurrent());
    // and contain both instances now
    assertEquals(2, t1.getInstances().size());
    // timeout is set to 3sec, so we now do heartbeats for 4sec with only instance1
    // to let instance2 crash
    builder.getSimulatedLeaseCollection().setFinal(false);
    l1.addExpected(Type.TOPOLOGY_CHANGING);
    for (int i = 0; i < 8; i++) {
        instance1.heartbeatsAndCheckView();
        Thread.sleep(500);
    }
    // INIT, CHANGING, CHANGED and CHANGING
    assertEquals(4, l1.getEvents().size());
    // no remaining expected
    assertEquals(0, l1.getRemainingExpectedCount());
    // and no unexpected
    assertEquals(0, l1.getUnexpectedCount());
    t1 = instance1.getDiscoveryService().getTopology();
    // and we should be current again
    assertFalse(t1.isCurrent());
    // and contain both instances now
    assertEquals(2, t1.getInstances().size());
}