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本文整理了Java中org.apache.twill.zookeeper.ZKClient.getChildren()
方法的一些代码示例,展示了ZKClient.getChildren()
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。ZKClient.getChildren()
方法的具体详情如下:
包路径:org.apache.twill.zookeeper.ZKClient
类名称:ZKClient
方法名:getChildren
[英]Gets the list of children nodes under the given path. Same as calling #getChildren(String,org.apache.zookeeper.Watcher).
[中]获取给定路径下的子节点列表。与调用#getChildren(String,org.apache.zookeeper.Watcher)相同。
代码示例来源:origin: apache/twill
@Override
public OperationFuture<NodeChildren> exec(String path, Watcher watcher) {
return zkClient.getChildren(path, watcher);
}
}, path, callback, cancelled);
代码示例来源:origin: org.apache.twill/twill-zookeeper
@Override
public OperationFuture<NodeChildren> exec(String path, Watcher watcher) {
return zkClient.getChildren(path, watcher);
}
}, path, callback, cancelled);
代码示例来源:origin: apache/twill
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return delegate.getChildren(path, watcher);
}
代码示例来源:origin: org.apache.twill/twill-zookeeper
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return delegate.getChildren(path, watcher);
}
代码示例来源:origin: org.apache.twill/twill-zookeeper
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return client.getChildren(path, watcher);
}
代码示例来源:origin: apache/twill
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return client.getChildren(path, watcher);
}
代码示例来源:origin: caskdata/coopr
/**
* Acts as {@link ZKClient#getChildren(String, Watcher)} if node exists.
* Otherwise sets {@code null} in returned future.
*/
public static ListenableFuture<NodeChildren> getChildrenOrNull(final ZKClient zkClient,
final String path,
@Nullable Watcher watcher) {
return ignoreError(zkClient.getChildren(path, watcher), KeeperException.NoNodeException.class);
}
代码示例来源:origin: apache/twill
/**
* Watches for messages that are sent through ZK messages node.
*/
private void watchMessages() {
final String messagesPath = getZKPath("messages");
Futures.addCallback(zkClient.getChildren(messagesPath, new Watcher() {
@Override
public void process(WatchedEvent event) {
if (event.getType() == Event.EventType.NodeChildrenChanged && isRunning()) {
watchMessages();
}
}
}), new FutureCallback<NodeChildren>() {
@Override
public void onSuccess(NodeChildren result) {
// Sort by the name, which is the messageId. Assumption is that message ids is ordered by time.
List<String> messages = Lists.newArrayList(result.getChildren());
Collections.sort(messages);
for (String messageId : messages) {
processMessage(messagesPath + "/" + messageId, messageId);
}
}
@Override
public void onFailure(Throwable t) {
// TODO: what could be done besides just logging?
LOG.error("Failed to watch messages.", t);
}
}, Threads.SAME_THREAD_EXECUTOR);
}
代码示例来源:origin: org.apache.twill/twill-core
/**
* Watches for messages that are sent through ZK messages node.
*/
private void watchMessages() {
final String messagesPath = getZKPath("messages");
Futures.addCallback(zkClient.getChildren(messagesPath, new Watcher() {
@Override
public void process(WatchedEvent event) {
if (event.getType() == Event.EventType.NodeChildrenChanged && isRunning()) {
watchMessages();
}
}
}), new FutureCallback<NodeChildren>() {
@Override
public void onSuccess(NodeChildren result) {
// Sort by the name, which is the messageId. Assumption is that message ids is ordered by time.
List<String> messages = Lists.newArrayList(result.getChildren());
Collections.sort(messages);
for (String messageId : messages) {
processMessage(messagesPath + "/" + messageId, messageId);
}
}
@Override
public void onFailure(Throwable t) {
// TODO: what could be done besides just logging?
LOG.error("Failed to watch messages.", t);
}
}, Threads.SAME_THREAD_EXECUTOR);
}
代码示例来源:origin: caskdata/cdap
zkClient.getChildren(CoordinationConstants.REQUIREMENTS_PATH, watcher),
wrapCallback(new FutureCallback<NodeChildren>() {
@Override
代码示例来源:origin: org.apache.twill/twill-yarn
/**
* Returns the list of children node under the given path.
*
* @param path path to get children
* @return the list of children or empty list if the path doesn't exist.
* @throws Exception if failed to get children
*/
private List<String> getChildren(String path) throws Exception {
try {
return zkClient.getChildren(path).get(TIMEOUT_SECONDS, TimeUnit.SECONDS).getChildren();
} catch (ExecutionException e) {
if (e.getCause() instanceof KeeperException.NoNodeException) {
// If the node doesn't exists, return an empty list
return Collections.emptyList();
}
throw e;
}
}
}
代码示例来源:origin: caskdata/coopr
private void clearInternal() {
if (currentView.size() > 0) {
currentView = Collections.emptyMap();
NodeChildren nodeChildren = Futures.getUnchecked(zkClient.getChildren(ENTRIES_PATH));
List<ListenableFuture<String>> deleteFutures = Lists.newArrayList();
for (String node : nodeChildren.getChildren()) {
deleteFutures.add(ZKClientExt.delete(zkClient, getNodePath(node), true));
}
Futures.getUnchecked(Futures.allAsList(deleteFutures));
}
}
代码示例来源:origin: apache/twill
/**
* Returns the list of children node under the given path.
*
* @param path path to get children
* @return the list of children or empty list if the path doesn't exist.
* @throws Exception if failed to get children
*/
private List<String> getChildren(String path) throws Exception {
try {
return zkClient.getChildren(path).get(TIMEOUT_SECONDS, TimeUnit.SECONDS).getChildren();
} catch (ExecutionException e) {
if (e.getCause() instanceof KeeperException.NoNodeException) {
// If the node doesn't exists, return an empty list
return Collections.emptyList();
}
throw e;
}
}
}
代码示例来源:origin: caskdata/coopr
public void clear() {
currentView.set(Collections.<String, T>emptyMap());
// Hint: again, we can try to make removal more efficient by cleaning only when in-mem collection cleaned smth,
// but then we may face races...
NodeChildren nodeChildren = Futures.getUnchecked(zkClient.getChildren(""));
List<ListenableFuture<String>> deleteFutures = Lists.newArrayList();
for (String node : nodeChildren.getChildren()) {
deleteFutures.add(ZKClientExt.delete(zkClient, getNodePath(node), true));
}
Futures.getUnchecked(Futures.allAsList(deleteFutures));
}
代码示例来源:origin: caskdata/coopr
public void clear() {
currentView.set(Collections.<T>emptyList());
// Hint: again, we can try to make removal more efficient by cleaning only when in-mem collection cleaned smth,
// but then we may face races...
NodeChildren nodeChildren = Futures.getUnchecked(zkClient.getChildren(""));
List<ListenableFuture<String>> deleteFutures = Lists.newArrayList();
for (String node : nodeChildren.getChildren()) {
deleteFutures.add(ZKClientExt.delete(zkClient, getNodePath(node), true));
}
Futures.getUnchecked(Futures.allAsList(deleteFutures));
}
代码示例来源:origin: org.apache.twill/twill-zookeeper
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return relayFuture(delegate.getChildren(getNamespacedPath(path), watcher), this.<NodeChildren>createFuture(path));
}
代码示例来源:origin: apache/twill
@Override
public OperationFuture<NodeChildren> getChildren(String path, @Nullable Watcher watcher) {
return relayFuture(delegate.getChildren(getNamespacedPath(path), watcher), this.<NodeChildren>createFuture(path));
}
代码示例来源:origin: caskdata/cdap
/**
* Fetches the latest participants from ZK. This method will block until it fetched all participants information.
* Note that the map returned is only a snapshot of the leader election information in ZK, which only reflects
* the states in ZK at the time when the snapshot was taken.
*
* @return An immutable {@link SortedMap} ordered by the participant ID with the smallest key in the map
* as the current leader
* @throws InterruptedException if the caller thread is interrupted while waiting for the participants information
* to be available
* @throws Exception if failed to fetch information from ZK
*/
public SortedMap<Integer, Participant> fetchCurrentParticipants() throws Exception {
try {
NodeChildren nodeChildren = zkClient.getChildren(leaderElectionPath).get();
ConcurrentNavigableMap<Integer, Participant> result = new ConcurrentSkipListMap<>();
SettableFuture<CountDownLatch> completion = SettableFuture.create();
childrenUpdated(nodeChildren, result, completion);
completion.get().await();
return Collections.unmodifiableSortedMap(result);
} catch (ExecutionException e) {
// If the election path doesn't exists, that means there is no participant
Throwable cause = e.getCause();
if (cause instanceof KeeperException.NoNodeException) {
return ImmutableSortedMap.of();
}
Throwables.propagateIfPossible(cause, Exception.class);
// Shouldn't reach here as we propagate any Exception/RuntimeException/Error already
return ImmutableSortedMap.of();
}
}
代码示例来源:origin: co.cask.cdap/cdap-common
/**
* Fetches the latest participants from ZK. This method will block until it fetched all participants information.
* Note that the map returned is only a snapshot of the leader election information in ZK, which only reflects
* the states in ZK at the time when the snapshot was taken.
*
* @return An immutable {@link SortedMap} ordered by the participant ID with the smallest key in the map
* as the current leader
* @throws InterruptedException if the caller thread is interrupted while waiting for the participants information
* to be available
* @throws Exception if failed to fetch information from ZK
*/
public SortedMap<Integer, Participant> fetchCurrentParticipants() throws Exception {
try {
NodeChildren nodeChildren = zkClient.getChildren(leaderElectionPath).get();
ConcurrentNavigableMap<Integer, Participant> result = new ConcurrentSkipListMap<>();
SettableFuture<CountDownLatch> completion = SettableFuture.create();
childrenUpdated(nodeChildren, result, completion);
completion.get().await();
return Collections.unmodifiableSortedMap(result);
} catch (ExecutionException e) {
// If the election path doesn't exists, that means there is no participant
Throwable cause = e.getCause();
if (cause instanceof KeeperException.NoNodeException) {
return ImmutableSortedMap.of();
}
Throwables.propagateIfPossible(cause, Exception.class);
// Shouldn't reach here as we propagate any Exception/RuntimeException/Error already
return ImmutableSortedMap.of();
}
}
代码示例来源:origin: caskdata/coopr
@Override
protected void startUp() throws Exception {
Futures.getUnchecked(ZKClientExt.ensureExists(zkClient, queueType.getPath()));
refreshQueues(Futures.getUnchecked(zkClient.getChildren(queueType.getPath())));
ZKOperations.watchChildren(zkClient, queueType.getPath(), new ZKOperations.ChildrenCallback() {
@Override
public void updated(NodeChildren nodeChildren) {
refreshQueues(nodeChildren);
}
});
}
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