org.apache.zookeeper.data.Stat.getNumChildren()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中org.apache.zookeeper.data.Stat.getNumChildren()方法的一些代码示例，展示了Stat.getNumChildren()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。Stat.getNumChildren()方法的具体详情如下：
包路径：org.apache.zookeeper.data.Stat
类名称：Stat
方法名：getNumChildren

Stat.getNumChildren介绍

暂无

代码示例

代码示例来源：origin: elasticjob/elastic-job-lite

@Override
public int getNumChildren(final String key) {
  try {
    Stat stat = client.checkExists().forPath(key);
    if (null != stat) {
      return stat.getNumChildren();
    }
    //CHECKSTYLE:OFF
  } catch (final Exception ex) {
    //CHECKSTYLE:ON
    RegExceptionHandler.handleException(ex);
  }
  return 0;
}

代码示例来源：origin: apache/hbase

@Override
public CompletableFuture<Integer> getCurrentNrHRS() {
 return zk.exists(znodePaths.rsZNode).thenApply(s -> s != null ? s.getNumChildren() : 0);
}

代码示例来源：origin: apache/zookeeper

public void print(Stat stat) {
    out.println("cZxid = 0x" + Long.toHexString(stat.getCzxid()));
    out.println("ctime = " + new Date(stat.getCtime()).toString());
    out.println("mZxid = 0x" + Long.toHexString(stat.getMzxid()));
    out.println("mtime = " + new Date(stat.getMtime()).toString());
    out.println("pZxid = 0x" + Long.toHexString(stat.getPzxid()));
    out.println("cversion = " + stat.getCversion());
    out.println("dataVersion = " + stat.getVersion());
    out.println("aclVersion = " + stat.getAversion());
    out.println("ephemeralOwner = 0x"
        + Long.toHexString(stat.getEphemeralOwner()));
    out.println("dataLength = " + stat.getDataLength());
    out.println("numChildren = " + stat.getNumChildren());
  }
}

代码示例来源：origin: org.apache.hadoop/hadoop-common

private void doWork()
 {
  for ( String path : paths )
  {
   try
   {
    List<String> children = client.getChildren().forPath(path);
    for ( String name : children )
    {
     String thisPath = ZKPaths.makePath(path, name);
     Stat stat = client.checkExists().forPath(thisPath);
     if ( (stat != null) && (stat.getNumChildren() == 0) )
     {
      reaper.addPath(thisPath, mode);
     }
    }
   }
   catch ( Exception e )
   {
    log.error("Could not get children for path: " + path, e);
   }
  }
 }
}

代码示例来源：origin: soabase/exhibitor

private void        processNode(String path, NodeEntry parent) throws Exception
  {
    Stat        stat = exhibitor.getLocalConnection().checkExists().forPath(path);
    if ( stat == null )
    {
      return; // probably got deleted
    }

    NodeEntry       entry = new NodeEntry(parent, stat.getNumChildren(), stat.getCtime());
    details.put(path, entry);

    entry.addToDeepCount(stat.getNumChildren());
    if ( stat.getNumChildren() <= maxChildren )
    {
      List<String> children = exhibitor.getLocalConnection().getChildren().forPath(path);
      for ( String child : children )
      {
        String  thisPath = ZKPaths.makePath(path, child);
        processNode(thisPath, entry);
      }
    }
  }
}

代码示例来源：origin: org.apache.zookeeper/zookeeper

private static void printStat(Stat stat) {
  System.err.println("cZxid = 0x" + Long.toHexString(stat.getCzxid()));
  System.err.println("ctime = " + new Date(stat.getCtime()).toString());
  System.err.println("mZxid = 0x" + Long.toHexString(stat.getMzxid()));
  System.err.println("mtime = " + new Date(stat.getMtime()).toString());
  System.err.println("pZxid = 0x" + Long.toHexString(stat.getPzxid()));
  System.err.println("cversion = " + stat.getCversion());
  System.err.println("dataVersion = " + stat.getVersion());
  System.err.println("aclVersion = " + stat.getAversion());
  System.err.println("ephemeralOwner = 0x"
      + Long.toHexString(stat.getEphemeralOwner()));
  System.err.println("dataLength = " + stat.getDataLength());
  System.err.println("numChildren = " + stat.getNumChildren());
}

代码示例来源：origin: apache/hbase

/**
 * Get the number of children of the specified node.
 *
 * If the node does not exist or has no children, returns 0.
 *
 * Sets no watches at all.
 *
 * @param zkw zk reference
 * @param znode path of node to count children of
 * @return number of children of specified node, 0 if none or parent does not
 *         exist
 * @throws KeeperException if unexpected zookeeper exception
 */
public static int getNumberOfChildren(ZKWatcher zkw, String znode)
 throws KeeperException {
 try {
  Stat stat = zkw.getRecoverableZooKeeper().exists(znode, null);
  return stat == null ? 0 : stat.getNumChildren();
 } catch(KeeperException e) {
  LOG.warn(zkw.prefix("Unable to get children of node " + znode));
  zkw.keeperException(e);
 } catch(InterruptedException e) {
  zkw.interruptedException(e);
 }
 return 0;
}

代码示例来源：origin: QNJR-GROUP/EasyTransaction

private void register(String stringType, String value) {
  
  try {
    
    //can not switch the order of sysStat and appStat.because of the zk sequential consistency
    Stat sysStat = client.checkExists().creatingParentContainersIfNeeded().forPath(getSystemTypePath(stringType));
    Stat appStringStat = client.checkExists().forPath(getAppBaseItemPath(stringType, value));
    if(appStringStat != null) {
      return;
    }
    
    if(sysStat == null) {
      createNodeIfNotExists(getSystemTypePath(stringType));
    }
    createNodeIfNotExists(getAppTypePath(stringType));
    
    int numChildren = 0;
    if(sysStat != null) {
      numChildren = sysStat.getNumChildren();
    }
    client.inTransaction()
    .create().forPath(getSystemBaseItemPath(stringType, numChildren + 1),value.getBytes()).and()
    .create().forPath(getAppBaseItemPath(stringType, value),ByteBuffer.allocate(4).putInt(numChildren + 1).array()).and()
    .commit();
    
  } catch (Exception e) {
    LOG.warn("register string in zk failed", e);
  }

}

代码示例来源：origin: apache/hbase

@Test
public void testGetAndExists() throws Exception {
 assertArrayEquals(DATA, RO_ZK.get(PATH).get());
 assertEquals(CHILDREN, RO_ZK.exists(PATH).get().getNumChildren());
 assertNotNull(RO_ZK.zookeeper);
 waitForIdleConnectionClosed();
}

代码示例来源：origin: apache/zookeeper

Assert.assertEquals(0, stat.getEphemeralOwner());
Assert.assertEquals(name.length(), stat.getDataLength());
Assert.assertEquals(i + 1, stat.getNumChildren());
Assert.assertEquals(s.size(), stat.getNumChildren());

代码示例来源：origin: apache/zookeeper

Assert.assertEquals(0, stat.getEphemeralOwner());
Assert.assertEquals(name.length(), stat.getDataLength());
Assert.assertEquals(1, stat.getNumChildren());
Assert.assertEquals(s.size(), stat.getNumChildren());
Assert.assertEquals(zk.getSessionId(), stat.getEphemeralOwner());
Assert.assertEquals(childname.length(), stat.getDataLength());
Assert.assertEquals(0, stat.getNumChildren());
Assert.assertEquals(s.size(), stat.getNumChildren());

代码示例来源：origin: apache/zookeeper

@Test
public void testChildren()
  throws IOException, KeeperException, InterruptedException
{
  String name = "/foo";
  zk.create(name, name.getBytes(), Ids.OPEN_ACL_UNSAFE,
      CreateMode.PERSISTENT);
  for(int i = 0; i < 10; i++) {
    String childname = name + "/bar" + i;
    zk.create(childname, childname.getBytes(), Ids.OPEN_ACL_UNSAFE,
        CreateMode.EPHEMERAL);
    Stat stat;
    stat = newStat();
    zk.getData(name, false, stat);
    Assert.assertEquals(stat.getCzxid(), stat.getMzxid());
    Assert.assertEquals(stat.getCzxid() + i + 1, stat.getPzxid());
    Assert.assertEquals(stat.getCtime(), stat.getMtime());
    Assert.assertEquals(i + 1, stat.getCversion());
    Assert.assertEquals(0, stat.getVersion());
    Assert.assertEquals(0, stat.getAversion());
    Assert.assertEquals(0, stat.getEphemeralOwner());
    Assert.assertEquals(name.length(), stat.getDataLength());
    Assert.assertEquals(i + 1, stat.getNumChildren());
  }
}

代码示例来源：origin: apache/zookeeper

@Test
public void testBasic()
  throws IOException, KeeperException, InterruptedException
{
  String name = "/foo";
  zk.create(name, name.getBytes(), Ids.OPEN_ACL_UNSAFE,
      CreateMode.PERSISTENT);
  Stat stat;
  stat = newStat();
  zk.getData(name, false, stat);
  Assert.assertEquals(stat.getCzxid(), stat.getMzxid());
  Assert.assertEquals(stat.getCzxid(), stat.getPzxid());
  Assert.assertEquals(stat.getCtime(), stat.getMtime());
  Assert.assertEquals(0, stat.getCversion());
  Assert.assertEquals(0, stat.getVersion());
  Assert.assertEquals(0, stat.getAversion());
  Assert.assertEquals(0, stat.getEphemeralOwner());
  Assert.assertEquals(name.length(), stat.getDataLength());
  Assert.assertEquals(0, stat.getNumChildren());
}

代码示例来源：origin: apache/zookeeper

static public void copyStat(Stat from, Stat to) {
  to.setAversion(from.getAversion());
  to.setCtime(from.getCtime());
  to.setCversion(from.getCversion());
  to.setCzxid(from.getCzxid());
  to.setMtime(from.getMtime());
  to.setMzxid(from.getMzxid());
  to.setPzxid(from.getPzxid());
  to.setVersion(from.getVersion());
  to.setEphemeralOwner(from.getEphemeralOwner());
  to.setDataLength(from.getDataLength());
  to.setNumChildren(from.getNumChildren());
}

代码示例来源：origin: org.apache.zookeeper/zookeeper

static public void copyStat(Stat from, Stat to) {
  to.setAversion(from.getAversion());
  to.setCtime(from.getCtime());
  to.setCversion(from.getCversion());
  to.setCzxid(from.getCzxid());
  to.setMtime(from.getMtime());
  to.setMzxid(from.getMzxid());
  to.setVersion(from.getVersion());
  to.setEphemeralOwner(from.getEphemeralOwner());
  to.setDataLength(from.getDataLength());
  to.setNumChildren(from.getNumChildren());
}

代码示例来源：origin: apache/zookeeper

Assert.assertEquals(0, stat.getEphemeralOwner());
Assert.assertEquals(name.length(), stat.getDataLength());
Assert.assertEquals(1, stat.getNumChildren());
Assert.assertEquals(zk.getSessionId(), stat.getEphemeralOwner());
Assert.assertEquals(childname.length(), stat.getDataLength());
Assert.assertEquals(0, stat.getNumChildren());

代码示例来源：origin: apache/zookeeper

Assert.assertEquals(0, stat.getEphemeralOwner());
Assert.assertEquals(name.length(), stat.getDataLength());
Assert.assertEquals(0, stat.getNumChildren());
Assert.assertEquals(0, stat.getEphemeralOwner());
Assert.assertEquals(name.length() * 2, stat.getDataLength());
Assert.assertEquals(0, stat.getNumChildren());

代码示例来源：origin: apache/zookeeper

private void validateCreateStat(Stat stat, String name) {
    Assert.assertEquals(stat.getCzxid(), stat.getMzxid());
    Assert.assertEquals(stat.getCzxid(), stat.getPzxid());
    Assert.assertEquals(stat.getCtime(), stat.getMtime());
    Assert.assertEquals(0, stat.getCversion());
    Assert.assertEquals(0, stat.getVersion());
    Assert.assertEquals(0, stat.getAversion());
    Assert.assertEquals(0, stat.getEphemeralOwner());
    Assert.assertEquals(name.length(), stat.getDataLength());
    Assert.assertEquals(0, stat.getNumChildren());
  }
}

代码示例来源：origin: org.apache.zookeeper/zookeeper

static public void copyStat(Stat from, Stat to) {
  to.setAversion(from.getAversion());
  to.setCtime(from.getCtime());
  to.setCversion(from.getCversion());
  to.setCzxid(from.getCzxid());
  to.setMtime(from.getMtime());
  to.setMzxid(from.getMzxid());
  to.setPzxid(from.getPzxid());
  to.setVersion(from.getVersion());
  to.setEphemeralOwner(from.getEphemeralOwner());
  to.setDataLength(from.getDataLength());
  to.setNumChildren(from.getNumChildren());
}

代码示例来源：origin: apache/zookeeper

private void validateCreateStat(Stat stat, String name) {
  Assert.assertEquals(stat.getCzxid(), stat.getMzxid());
  Assert.assertEquals(stat.getCzxid(), stat.getPzxid());
  Assert.assertEquals(stat.getCtime(), stat.getMtime());
  Assert.assertEquals(0, stat.getCversion());
  Assert.assertEquals(0, stat.getVersion());
  Assert.assertEquals(0, stat.getAversion());
  Assert.assertEquals(0, stat.getEphemeralOwner());
  Assert.assertEquals(name.length(), stat.getDataLength());
  Assert.assertEquals(0, stat.getNumChildren());
 }
}

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