Java KeeperException.ConnectionLossException方法代碼示例

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public Stat setData(String path, byte[] data, int version)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.setData(path, data, version);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
            Stat s = exists(path, false);
            if (s != null) {
                if (getData(path, false, s) == data) {
                    return s;
                }
            } else {
                return null;
            }
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
/**
 * We create a perfectly valid 'exists' request, except that the opcode is wrong.
 * @return
 * @throws Exception
 */
@Test
public void testNonExistingOpCode() throws Exception  {
    TestableZooKeeper zk = createClient();

    final String path = "/m1";

    RequestHeader h = new RequestHeader();
    h.setType(888);  // This code does not exists
    ExistsRequest request = new ExistsRequest();
    request.setPath(path);
    request.setWatch(false);
    ExistsResponse response = new ExistsResponse();
    ReplyHeader r = zk.submitRequest(h, request, response, null);

    Assert.assertEquals(r.getErr(), Code.UNIMPLEMENTED.intValue());

    try {
        zk.exists("/m1", false);
        fail("The connection should have been closed");
    } catch (KeeperException.ConnectionLossException expected) {
    }
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public Stat setACL(String path, List<ACL> acl, int version)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.setACL(path, acl, version);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
            Stat s = exists(path, false);
            if (s != null) {
                if (getACL(path, s).equals(acl)) {
                    return s;
                }
            } else {
                return null;
            }
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
public CuratorFramework getZookeeperClient() throws KeeperException.ConnectionLossException {
	if (zkClient.getZookeeperClient().isConnected()) {
		return this.zkClient;
	} else {
		throw new KeeperException.ConnectionLossException();
	}

}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public List<String> getChildren(String path, boolean watch)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.getChildren(path, watch ? watcher : null);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return new ArrayList<String>();
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public List<ACL> getACL(String path, Stat stat) throws KeeperException,
        InterruptedException {
    int count = 0;
    do {
        try {
            return super.getACL(path, stat);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public Stat exists(String path, Watcher watcher) throws KeeperException,
        InterruptedException {
    int count = 0;
    do {
        try {
            return super.exists(path, watcher);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public byte[] getData(String path, boolean watch, Stat stat)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.getData(path, watch ? watcher : null, stat);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public List<String> getChildren(String path, Watcher watcher)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.getChildren(path, watcher);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return new ArrayList<String>();
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
@Override
public byte[] getData(String path, Watcher watcher, Stat stat)
        throws KeeperException, InterruptedException {
    int count = 0;
    do {
        try {
            return super.getData(path, watcher, stat);
        } catch (KeeperException.ConnectionLossException e) {
            LoggerFactory.getLogger().warn(
                    "ZooKeeper connection lost.  Trying to reconnect.");
        }
    } while (!closed && (limit == -1 || count++ < limit));
    return null;
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
public static void testNormalOperation(ZooKeeper writer, ZooKeeper reader)
        throws KeeperException, InterruptedException {
    boolean testReaderNodeExists = false;
    boolean testWriterNodeExists = false;

    for (int j = 0; j < 30; j++) {
        try {
            if (!testWriterNodeExists) {
                createZNode(writer, "/test", "test");
                testWriterNodeExists = true;
            }

            if (!testReaderNodeExists) {
                createZNode(reader, "/dummy", "dummy");
                testReaderNodeExists = true;
            }

            String data = "test" + j;
            writer.setData("/test", data.getBytes(), -1);
            // Use setData instead of sync API to force a view update.
            // Check ZOOKEEPER-2137 for details.
            reader.setData("/dummy", "dummy".getBytes(), -1);
            byte[] res = reader.getData("/test", null, new Stat());
            Assert.assertEquals(data, new String(res));
            break;
        } catch (KeeperException.ConnectionLossException e) {
            if (j < 29) {
                Thread.sleep(1000);
            } else {
                // test fails if we still can't connect to the quorum after
                // 30 seconds.
                Assert.fail("client could not connect to reestablished quorum: giving up after 30+ seconds.");
            }
        }
    }
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
/**
 * Make sure that we cannot have two connections with the same
 * session id.
 *
 * @throws IOException
 * @throws InterruptedException
 * @throws KeeperException
 */
@Test
public void testSessionMove() throws Exception {
    String hostPorts[] = HOSTPORT.split(",");
    DisconnectableZooKeeper zk = new DisconnectableZooKeeper(hostPorts[0],
            CONNECTION_TIMEOUT, new MyWatcher("0"));
    zk.create("/sessionMoveTest", new byte[0], Ids.OPEN_ACL_UNSAFE,
            CreateMode.EPHEMERAL);
    // we want to loop through the list twice
    for(int i = 0; i < hostPorts.length*2; i++) {
        zk.dontReconnect();
        // This should stomp the zk handle
        DisconnectableZooKeeper zknew = new DisconnectableZooKeeper(
                hostPorts[(i+1)%hostPorts.length],
                CONNECTION_TIMEOUT,
                new MyWatcher(Integer.toString(i+1)),
                zk.getSessionId(),
                zk.getSessionPasswd());
        final int result[] = new int[1];
        result[0] = Integer.MAX_VALUE;
        zknew.sync("/", new AsyncCallback.VoidCallback() {
                public void processResult(int rc, String path, Object ctx) {
                    synchronized(result) { result[0] = rc; result.notify(); }
                }
            }, null);
        synchronized(result) {
            if(result[0] == Integer.MAX_VALUE) {
                result.wait(5000);
            }
        }
        LOG.info(hostPorts[(i+1)%hostPorts.length] + " Sync returned " + result[0]);
        Assert.assertTrue(result[0] == KeeperException.Code.OK.intValue());
        zknew.setData("/", new byte[1], -1);
        try {
            zk.setData("/", new byte[1], -1);
            Assert.fail("Should have lost the connection");
        } catch(KeeperException.ConnectionLossException e) {
            LOG.info("Got connection loss exception as expected");
        }
        //zk.close();
        zk = zknew;
    }
    zk.close();
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
/**
 * Connect to two different servers with two different handles using the same session and
 * make sure we cannot do any changes.
 */
@Test
@Ignore
public void testSessionMove() throws Exception {
    String hps[] = qb.hostPort.split(",");
    DiscoWatcher oldWatcher = new DiscoWatcher();
    DisconnectableZooKeeper zk = new DisconnectableZooKeeper(hps[0],
            ClientBase.CONNECTION_TIMEOUT, oldWatcher);
    zk.create("/t1", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    zk.dontReconnect();
    // This should stomp the zk handle
    DiscoWatcher watcher = new DiscoWatcher();
    DisconnectableZooKeeper zknew = new DisconnectableZooKeeper(hps[1],
            ClientBase.CONNECTION_TIMEOUT, watcher, zk.getSessionId(),
            zk.getSessionPasswd());
    zknew.create("/t2", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    try {
        zk.create("/t3", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
        Assert.fail("Should have lost the connection");
    } catch(KeeperException.ConnectionLossException e) {
        // wait up to 30 seconds for the disco to be delivered
        for (int i = 0; i < 30; i++) {
            if (oldWatcher.zkDisco) {
                break;
            }
            Thread.sleep(1000);
        }
        Assert.assertTrue(oldWatcher.zkDisco);
    }

    ArrayList<ZooKeeper> toClose = new ArrayList<ZooKeeper>();
    toClose.add(zknew);
    // Let's just make sure it can still move
    for(int i = 0; i < 10; i++) {
        zknew.dontReconnect();
        zknew = new DisconnectableZooKeeper(hps[1],
                ClientBase.CONNECTION_TIMEOUT, new DiscoWatcher(),
                zk.getSessionId(), zk.getSessionPasswd());
        toClose.add(zknew);
        zknew.create("/t-"+i, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    }
    for (ZooKeeper z: toClose) {
        z.close();
    }
    zk.close();
}
 

import org.apache.zookeeper.KeeperException; //導入方法依賴的package包/類
/**
 * Ensures that upon connection to a read-only server client receives
 * ConnectedReadOnly state notification.
 */
@Test(timeout = 90000)
public void testConnectionEvents() throws Exception {
    final List<KeeperState> states = new ArrayList<KeeperState>();
    ZooKeeper zk = new ZooKeeper(qu.getConnString(), CONNECTION_TIMEOUT,
            new Watcher() {
                public void process(WatchedEvent event) {
                    states.add(event.getState());
                }
            }, true);
    boolean success = false;
    for (int i = 0; i < 30; i++) {
        try {
            zk.create("/test", "test".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE,
                    CreateMode.PERSISTENT);
            success=true;
            break;
        } catch(KeeperException.ConnectionLossException e) {
            Thread.sleep(1000);               
        }            
    }
    Assert.assertTrue("Did not succeed in connecting in 30s", success);

    // kill peer and wait no more than 5 seconds for read-only server
    // to be started (which should take one tickTime (2 seconds))
    qu.shutdown(2);
    long start = System.currentTimeMillis();
    while (!(zk.getState() == States.CONNECTEDREADONLY)) {
        Thread.sleep(200);
        // FIXME this was originally 5 seconds, but realistically, on random/slow/virt hosts, there is no way to guarantee this
        Assert.assertTrue("Can't connect to the server", System
                .currentTimeMillis()
                - start < 30000);
    }

    // At this point states list should contain, in the given order,
    // SyncConnected, Disconnected, and ConnectedReadOnly states
    Assert.assertTrue("ConnectedReadOnly event wasn't received", states
            .get(2) == KeeperState.ConnectedReadOnly);
    zk.close();
}