org.apache.zookeeper.ZooKeeper.getData()方法的使用及代码示例

x33g5p2x  于2022-02-05 转载在 其他  
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本文整理了Java中org.apache.zookeeper.ZooKeeper.getData()方法的一些代码示例，展示了ZooKeeper.getData()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ZooKeeper.getData()方法的具体详情如下：
包路径：org.apache.zookeeper.ZooKeeper
类名称：ZooKeeper
方法名：getData

ZooKeeper.getData介绍

[英]The asynchronous version of getData.
[中]getData的异步版本。

代码示例

代码示例来源：origin: apache/zookeeper

/**
 * The asynchronous version of getData.
 *
 * @see #getData(String, boolean, Stat)
 */
public void getData(String path, boolean watch, DataCallback cb, Object ctx) {
  getData(path, watch ? watchManager.defaultWatcher : null, cb, ctx);
}

代码示例来源：origin: apache/hbase

@Override
 protected void doExec(ZooKeeper zk) {
  zk.getData(path, false,
    (rc, path, ctx, data, stat) -> onComplete(zk, rc, data, true), null);
 }
});

代码示例来源：origin: apache/zookeeper

private void utestGet(int port)
  throws IOException, InterruptedException, KeeperException
{
  ZooKeeper zk =
    new ZooKeeper("127.0.0.1:" + port, CONNECTION_TIMEOUT, this);
  for (int i = 0; i < 10000; i++) {
    Stat stat = new Stat();
    zk.getData("/" + i, true, stat);
  }
  zk.close();
}

代码示例来源：origin: apache/zookeeper

private void compareStat(String path, int sid, int compareWithSid) throws Exception{
  Stat stat1 = new Stat();
  zk[sid].getData(path, null, stat1);
  Stat stat2 = new Stat();
  zk[compareWithSid].getData(path, null, stat2);
  Assert.assertEquals(stat1, stat2);
}

代码示例来源：origin: apache/hbase

@Override
public void checkTaskStillAvailable(String path) {
 // A negative retry count will lead to ignoring all error processing.
 this.watcher
   .getRecoverableZooKeeper()
   .getZooKeeper()
   .getData(path, this.watcher, new GetDataAsyncCallback(),
    Long.valueOf(-1) /* retry count */);
 SplitLogCounters.tot_mgr_get_data_queued.increment();
}

代码示例来源：origin: apache/ignite

/**
 * @param path Path.
 * @param watcher Watcher.
 * @param cb Callback.
 */
void getDataAsync(String path, Watcher watcher, AsyncCallback.DataCallback cb) {
  GetDataOperation op = new GetDataOperation(path, watcher, cb);
  zk.getData(path, watcher, new DataCallbackWrapper(op), null);
}

代码示例来源：origin: apache/hbase

private void getDataSetWatch(String path, Long retry_count) {
 this.watcher.getRecoverableZooKeeper().getZooKeeper()
   .getData(path, this.watcher, new GetDataAsyncCallback(), retry_count);
 SplitLogCounters.tot_mgr_get_data_queued.increment();
}

代码示例来源：origin: apache/hbase

public void getDataSetWatchAsync() {
 watcher.getRecoverableZooKeeper().getZooKeeper()
   .getData(currentTask, watcher, new GetDataAsyncCallback(), null);
 SplitLogCounters.tot_wkr_get_data_queued.increment();
}

代码示例来源：origin: apache/zookeeper

void readAll() {
  for (int i = 0; i < count; i++) {
    String cpath = path + "/" + i;
    zk.getData(cpath, false, this, null);
    incOutstanding();
  }
}

代码示例来源：origin: ltsopensource/light-task-scheduler

@Override
public <T> T getData(String path) {
  // 暂时不watch data change 所以第二个参数为false
  try {
    byte[] data = zk.getData(path, false, null);
    return (T) serializer.deserialize(data);
  } catch (KeeperException e) {
    throw new ZkException(e);
  } catch (InterruptedException e) {
    throw new ZkInterruptedException(e);
  }
}

代码示例来源：origin: apache/zookeeper

@Test
public void testCreate() throws Exception {
  multi(zk, Arrays.asList(
      Op.create("/multi0", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT),
      Op.create("/multi1", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT),
      Op.create("/multi2", new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT)
      ));
  zk.getData("/multi0", false, null);
  zk.getData("/multi1", false, null);
  zk.getData("/multi2", false, null);
}

代码示例来源：origin: apache/zookeeper

/**
 * Visits the subtree with root as given path and calls the passed callback with each znode
 * found during the search. It performs a depth-first, pre-order traversal of the tree.
 * <p>
 * <b>Important:</b> This is <i>not an atomic snapshot</i> of the tree ever, but the
 * state as it exists across multiple RPCs from zkClient to the ensemble.
 * For practical purposes, it is suggested to bring the clients to the ensemble
 * down (i.e. prevent writes to pathRoot) to 'simulate' a snapshot behavior.
 */
public static void visitSubTreeDFS(ZooKeeper zk, final String path, boolean watch,
  StringCallback cb) throws KeeperException, InterruptedException {
  PathUtils.validatePath(path);
  zk.getData(path, watch, null);
  cb.processResult(Code.OK.intValue(), path, null, path);
  visitSubTreeDFSHelper(zk, path, watch, cb);
}

代码示例来源：origin: apache/zookeeper

public void verifyGetDataFailure_NoNode() {
  rc = KeeperException.Code.NONODE;
  data = null;
  stat = null;
  zk.getData(path, false, this, toString());
  verify();
}

代码示例来源：origin: apache/zookeeper

@Test
public void testSetData() throws Exception {
  String[] names = {"/multi0", "/multi1", "/multi2"};
  List<Op> ops = new ArrayList<Op>();
  for (int i = 0; i < names.length; i++) {
    ops.add(Op.create(names[i], new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT));
    ops.add(Op.setData(names[i], names[i].getBytes(), 0));
  }
  multi(zk, ops) ;
  for (int i = 0; i < names.length; i++) {
    Assert.assertArrayEquals(names[i].getBytes(), zk.getData(names[i], false, null));
  }
}

代码示例来源：origin: apache/zookeeper

public void validAuth() throws Exception {
  ZooKeeper zk = createClient();
  // any multiple of 5 will do...
  zk.addAuthInfo("key", "25".getBytes());
  try {
    createNodePrintAcl(zk, "/valid", "testValidAuth");
    zk.getData("/abc", false, null);
    zk.setData("/abc", "testData3".getBytes(), -1);
  } catch (KeeperException.AuthFailedException e) {
    Assert.fail("test failed :" + e);
  } finally {
    zk.close();
  }
}

代码示例来源：origin: apache/zookeeper

public void validAuth2() throws Exception {
  ZooKeeper zk = createClient();
  // any multiple of 5 will do...
  zk.addAuthInfo("key", "125".getBytes());
  try {
    createNodePrintAcl(zk, "/valid2", "testValidAuth2");
    zk.getData("/abc", false, null);
    zk.setData("/abc", "testData3".getBytes(), -1);
  } catch (KeeperException.AuthFailedException e) {
    Assert.fail("test failed :" + e);
  } finally {
    zk.close();
  }
}

代码示例来源：origin: apache/zookeeper

public void missingAuth() throws Exception {
  ZooKeeper zk = createClient();
  try {
    zk.getData("/abc", false, null);
    Assert.fail("Should not be able to get data");
  } catch (KeeperException correct) {
    // correct
  }
  try {
    zk.setData("/abc", "testData2".getBytes(), -1);
    Assert.fail("Should not be able to set data");
  } catch (KeeperException correct) {
    // correct
  } finally {
    zk.close();
  }
}

代码示例来源：origin: apache/zookeeper

@Test
public void testClientResponseStatsUpdate() throws IOException, InterruptedException, KeeperException {
  try (ZooKeeper zk = createClient()) {
    BufferStats clientResponseStats = serverFactory.getZooKeeperServer().serverStats().getClientResponseStats();
    assertThat("Last client response size should be initialized with INIT_VALUE",
        clientResponseStats.getLastBufferSize(), equalTo(BufferStats.INIT_VALUE));
    zk.create("/a", "test".getBytes(), Ids.OPEN_ACL_UNSAFE,
        CreateMode.PERSISTENT);
    assertThat("Last client response size should be greater than 0 after client request was performed",
        clientResponseStats.getLastBufferSize(), greaterThan(0));
    byte[] contents = zk.getData("/a", null, null);
    assertArrayEquals("unexpected data", "test".getBytes(), contents);
  }
}

代码示例来源：origin: apache/zookeeper

public void verifyGetData() {
  new StringCB(zk).verifyCreate();
  zk.getData(path, false, this, toString());
  verify();
}

代码示例来源：origin: twitter/distributedlog

private static MaxLogSegmentSequenceNo getMaxLogSegmentSequenceNo(ZooKeeperClient zkc, URI uri, String streamName,
                                 DistributedLogConfiguration conf) throws Exception {
  Stat stat = new Stat();
  String logSegmentsPath = ZKLogMetadata.getLogSegmentsPath(
      uri, streamName, conf.getUnpartitionedStreamName());
  byte[] data = zkc.get().getData(logSegmentsPath, false, stat);
  Versioned<byte[]> maxLSSNData = new Versioned<byte[]>(data, new ZkVersion(stat.getVersion()));
  return new MaxLogSegmentSequenceNo(maxLSSNData);
}

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