Java Chore类代码示例

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
private static Thread getAndStartBalancerChore(final HMaster master) {
  String name = master.getServerName() + "-BalancerChore";
  int balancerPeriod =
    master.getConfiguration().getInt("hbase.balancer.period", 300000);
  // Start up the load balancer chore
  Chore chore = new Chore(name, balancerPeriod, master) {
    @Override
    protected void chore() {
      master.balance();
    }
  };
  return Threads.setDaemonThreadRunning(chore.getThread());
}
 

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
/**
 * Creates a chore that is used to clean up old nonces.
 * @param stoppable Stoppable for the chore.
 * @return Chore; the chore is not started.
 */
public Chore createCleanupChore(Stoppable stoppable) {
  // By default, it will run every 6 minutes (30 / 5).
  return new Chore("nonceCleaner", deleteNonceGracePeriod / 5, stoppable) {
    @Override
    protected void chore() {
      cleanUpOldNonces();
    }
  };
}
 

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
@Test
public void testCleanup() throws Exception {
  ManualEnvironmentEdge edge = new ManualEnvironmentEdge();
  EnvironmentEdgeManager.injectEdge(edge);
  try {
    ServerNonceManager nm = createManager(6);
    Chore cleanup = nm.createCleanupChore(Mockito.mock(Stoppable.class));
    edge.setValue(1);
    assertTrue(nm.startOperation(NO_NONCE, 1, createStoppable()));
    assertTrue(nm.startOperation(NO_NONCE, 2, createStoppable()));
    assertTrue(nm.startOperation(NO_NONCE, 3, createStoppable()));
    edge.setValue(2);
    nm.endOperation(NO_NONCE, 1, true);
    edge.setValue(4);
    nm.endOperation(NO_NONCE, 2, true);
    edge.setValue(9);
    cleanup.choreForTesting();
    // Nonce 1 has been cleaned up.
    assertTrue(nm.startOperation(NO_NONCE, 1, createStoppable()));
    // Nonce 2 has not been cleaned up.
    assertFalse(nm.startOperation(NO_NONCE, 2, createStoppable()));
    // Nonce 3 was active and active ops should never be cleaned up; try to end and start.
    nm.endOperation(NO_NONCE, 3, false);
    assertTrue(nm.startOperation(NO_NONCE, 3, createStoppable()));
    edge.setValue(11);
    cleanup.choreForTesting();
    // Now, nonce 2 has been cleaned up.
    assertTrue(nm.startOperation(NO_NONCE, 2, createStoppable()));
  } finally {
    EnvironmentEdgeManager.reset();
  }
}
 

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
@Test
public void testWalNonces() throws Exception {
  ManualEnvironmentEdge edge = new ManualEnvironmentEdge();
  EnvironmentEdgeManager.injectEdge(edge);
  try {
    ServerNonceManager nm = createManager(6);
    Chore cleanup = nm.createCleanupChore(Mockito.mock(Stoppable.class));
    // Add nonces from WAL, including dups.
    edge.setValue(12);
    nm.reportOperationFromWal(NO_NONCE, 1, 8);
    nm.reportOperationFromWal(NO_NONCE, 2, 2);
    nm.reportOperationFromWal(NO_NONCE, 3, 5);
    nm.reportOperationFromWal(NO_NONCE, 3, 6);
    // WAL nonces should prevent cross-server conflicts.
    assertFalse(nm.startOperation(NO_NONCE, 1, createStoppable()));
    // Make sure we ignore very old nonces, but not borderline old nonces.
    assertTrue(nm.startOperation(NO_NONCE, 2, createStoppable()));
    assertFalse(nm.startOperation(NO_NONCE, 3, createStoppable()));
    // Make sure grace period is counted from recovery time.
    edge.setValue(17);
    cleanup.choreForTesting();
    assertFalse(nm.startOperation(NO_NONCE, 1, createStoppable()));
    assertFalse(nm.startOperation(NO_NONCE, 3, createStoppable()));
    edge.setValue(19);
    cleanup.choreForTesting();
    assertTrue(nm.startOperation(NO_NONCE, 1, createStoppable()));
    assertTrue(nm.startOperation(NO_NONCE, 3, createStoppable()));
  } finally {
    EnvironmentEdgeManager.reset();
  }
}
 

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
private static Thread getAndStartClusterStatusChore(HMaster master) {
  if (master == null || master.balancer == null) {
    return null;
  }
  Chore chore = new ClusterStatusChore(master, master.balancer);
  return Threads.setDaemonThreadRunning(chore.getThread());
}
 

import org.apache.hadoop.hbase.Chore; //导入依赖的package包/类
private static Thread getAndStartBalancerChore(final HMaster master) {
  // Start up the load balancer chore
  Chore chore = new BalancerChore(master);
  return Threads.setDaemonThreadRunning(chore.getThread());
}