Examples with IZkConnection org.I0Itec.zkclient.IZkConnection used on opensource projects

Example 1 with IZkConnection

use of org.I0Itec.zkclient.IZkConnection in project otter by alibaba.

the class DistributedLock method acquireLock.

// ===================== helper method =============================
/**
 * 执行lock操作，允许传递watch变量控制是否需要阻塞lock操作
 */
private Boolean acquireLock(final BooleanMutex mutex) {
    try {
        do {
            if (id == null) {
                // 构建当前lock的唯一标识
                long sessionId = getSessionId();
                String prefix = "x-" + sessionId + "-";
                // 如果第一次，则创建一个节点
                String path = zookeeper.create(root + "/" + prefix, data, CreateMode.EPHEMERAL_SEQUENTIAL);
                int index = path.lastIndexOf("/");
                id = StringUtils.substring(path, index + 1);
                idName = new LockNode(id);
            }
            if (id != null) {
                List<String> names = zookeeper.getChildren(root);
                if (names.isEmpty()) {
                    logger.warn("lock lost with scene:empty list, id[] and node[]", id, idName);
                    // 异常情况，退出后重新创建一个
                    unlock();
                } else {
                    // 对节点进行排序
                    SortedSet<LockNode> sortedNames = new TreeSet<LockNode>();
                    for (String name : names) {
                        sortedNames.add(new LockNode(name));
                    }
                    if (sortedNames.contains(idName) == false) {
                        logger.warn("lock lost with scene:not contains ,id[] and node[]", id, idName);
                        // 异常情况，退出后重新创建一个
                        unlock();
                        continue;
                    }
                    // 将第一个节点做为ownerId
                    ownerId = sortedNames.first().getName();
                    if (mutex != null && isOwner()) {
                        // 直接更新状态，返回
                        mutex.set(true);
                        return true;
                    } else if (mutex == null) {
                        return isOwner();
                    }
                    SortedSet<LockNode> lessThanMe = sortedNames.headSet(idName);
                    if (!lessThanMe.isEmpty()) {
                        // 关注一下排队在自己之前的最近的一个节点
                        LockNode lastChildName = lessThanMe.last();
                        lastChildId = lastChildName.getName();
                        // 异步watcher处理
                        IZkConnection connection = zookeeper.getConnection();
                        // zkclient包装的是一个持久化的zk，分布式lock只需要一次性的watcher，需要调用原始的zk链接进行操作
                        ZooKeeper orginZk = ((ZooKeeperx) connection).getZookeeper();
                        Stat stat = orginZk.exists(root + "/" + lastChildId, new AsyncWatcher() {

                            public void asyncProcess(WatchedEvent event) {
                                if (!mutex.state()) {
                                    // 避免重复获取lock
                                    acquireLock(mutex);
                                } else {
                                    logger.warn("locked successful.");
                                }
                            }
                        });
                        if (stat == null) {
                            // 如果节点不存在，需要自己重新触发一下，watcher不会被挂上去
                            acquireLock(mutex);
                        }
                    } else {
                        if (isOwner()) {
                            mutex.set(true);
                        } else {
                            logger.warn("lock lost with scene:no less ,id[] and node[]", id, idName);
                            // 可能自己的节点已超时挂了，所以id和ownerId不相同
                            unlock();
                        }
                    }
                }
            }
        } while (id == null);
    } catch (KeeperException e) {
        exception = e;
        if (mutex != null) {
            mutex.set(true);
        }
    } catch (InterruptedException e) {
        interrupt = e;
        if (mutex != null) {
            mutex.set(true);
        }
    } catch (Throwable e) {
        other = e;
        if (mutex != null) {
            mutex.set(true);
        }
    }
    if (isOwner() && mutex != null) {
        mutex.set(true);
    }
    return Boolean.FALSE;
}

Example 2 with IZkConnection

use of org.I0Itec.zkclient.IZkConnection in project otter by alibaba.

the class ArbitrateViewServiceImpl method listProcesses.

public List<ProcessStat> listProcesses(Long channelId, Long pipelineId) {
    List<ProcessStat> processStats = new ArrayList<ProcessStat>();
    String processRoot = ManagePathUtils.getProcessRoot(channelId, pipelineId);
    IZkConnection connection = zookeeper.getConnection();
    // zkclient会将获取stat信息和正常的操作分开，使用原生的zk进行优化
    ZooKeeper orginZk = ((ZooKeeperx) connection).getZookeeper();
    // 获取所有的process列表
    List<String> processNodes = zookeeper.getChildren(processRoot);
    List<Long> processIds = new ArrayList<Long>();
    for (String processNode : processNodes) {
        processIds.add(ManagePathUtils.getProcessId(processNode));
    }
    Collections.sort(processIds);
    for (int i = 0; i < processIds.size(); i++) {
        Long processId = processIds.get(i);
        // 当前的process可能会有变化
        ProcessStat processStat = new ProcessStat();
        processStat.setPipelineId(pipelineId);
        processStat.setProcessId(processId);
        List<StageStat> stageStats = new ArrayList<StageStat>();
        processStat.setStageStats(stageStats);
        try {
            String processPath = ManagePathUtils.getProcess(channelId, pipelineId, processId);
            Stat zkProcessStat = new Stat();
            List<String> stages = orginZk.getChildren(processPath, false, zkProcessStat);
            Collections.sort(stages, new StageComparator());
            StageStat prev = null;
            for (String stage : stages) {
                // 循环每个process下的stage
                String stagePath = processPath + "/" + stage;
                Stat zkStat = new Stat();
                StageStat stageStat = new StageStat();
                stageStat.setPipelineId(pipelineId);
                stageStat.setProcessId(processId);
                byte[] bytes = orginZk.getData(stagePath, false, zkStat);
                if (bytes != null && bytes.length > 0) {
                    // 特殊处理zookeeper里的data信息，manager没有对应node中PipeKey的对象，所以导致反序列化会失败，需要特殊处理，删除'@'符号
                    String json = StringUtils.remove(new String(bytes, "UTF-8"), '@');
                    EtlEventData data = JsonUtils.unmarshalFromString(json, EtlEventData.class);
                    stageStat.setNumber(data.getNumber());
                    stageStat.setSize(data.getSize());
                    Map exts = new HashMap();
                    if (!CollectionUtils.isEmpty(data.getExts())) {
                        exts.putAll(data.getExts());
                    }
                    exts.put("currNid", data.getCurrNid());
                    exts.put("nextNid", data.getNextNid());
                    exts.put("desc", data.getDesc());
                    stageStat.setExts(exts);
                }
                if (prev != null) {
                    // 对应的start时间为上一个节点的结束时间
                    stageStat.setStartTime(prev.getEndTime());
                } else {
                    // process的最后修改时间,select
                    stageStat.setStartTime(zkProcessStat.getMtime());
                // await成功后会设置USED标志位
                }
                stageStat.setEndTime(zkStat.getMtime());
                if (ArbitrateConstants.NODE_SELECTED.equals(stage)) {
                    stageStat.setStage(StageType.SELECT);
                } else if (ArbitrateConstants.NODE_EXTRACTED.equals(stage)) {
                    stageStat.setStage(StageType.EXTRACT);
                } else if (ArbitrateConstants.NODE_TRANSFORMED.equals(stage)) {
                    stageStat.setStage(StageType.TRANSFORM);
                // } else if
                // (ArbitrateConstants.NODE_LOADED.equals(stage)) {
                // stageStat.setStage(StageType.LOAD);
                }
                prev = stageStat;
                stageStats.add(stageStat);
            }
            // 添加一个当前正在处理的
            StageStat currentStageStat = new StageStat();
            currentStageStat.setPipelineId(pipelineId);
            currentStageStat.setProcessId(processId);
            if (prev == null) {
                byte[] bytes = orginZk.getData(processPath, false, zkProcessStat);
                if (bytes == null || bytes.length == 0) {
                    // 直接认为未使用，忽略之
                    continue;
                }
                ProcessNodeEventData nodeData = JsonUtils.unmarshalFromByte(bytes, ProcessNodeEventData.class);
                if (nodeData.getStatus().isUnUsed()) {
                    // 跳过该process
                    continue;
                } else {
                    // select操作
                    currentStageStat.setStage(StageType.SELECT);
                    currentStageStat.setStartTime(zkProcessStat.getMtime());
                }
            } else {
                // 判断上一个节点，确定当前的stage
                StageType stage = prev.getStage();
                if (stage.isSelect()) {
                    currentStageStat.setStage(StageType.EXTRACT);
                } else if (stage.isExtract()) {
                    currentStageStat.setStage(StageType.TRANSFORM);
                } else if (stage.isTransform()) {
                    currentStageStat.setStage(StageType.LOAD);
                } else if (stage.isLoad()) {
                    // 已经是最后一个节点了
                    continue;
                }
                // 开始时间为上一个节点的结束时间
                currentStageStat.setStartTime(prev.getEndTime());
            }
            if (currentStageStat.getStage().isLoad()) {
                // load必须为第一个process节点
                if (i == 0) {
                    stageStats.add(currentStageStat);
                }
            } else {
                // 其他情况都添加
                stageStats.add(currentStageStat);
            }
        } catch (NoNodeException e) {
        // ignore
        } catch (KeeperException e) {
            throw new ArbitrateException(e);
        } catch (InterruptedException e) {
        // ignore
        } catch (UnsupportedEncodingException e) {
        // ignore
        }
        processStats.add(processStat);
    }
    return processStats;
}

Example 3 with IZkConnection

use of org.I0Itec.zkclient.IZkConnection in project otter by alibaba.

the class StageMonitor method syncStage.

// /**
// * 监听process的新增/删除变化，触发process列表的更新
// */
// private void syncStage() {
// // 1. 根据pipelineId构造对应的path
// String path = null;
// try {
// path = StagePathUtils.getProcessRoot(getPipelineId());
// // 2. 监听当前的process列表的变化
// List<String> currentProcesses = zookeeper.getChildren(path, new AsyncWatcher() {
// 
// public void asyncProcess(WatchedEvent event) {
// MDC.put(ArbitrateConstants.splitPipelineLogFileKey, String.valueOf(getPipelineId()));
// if (isStop()) {
// return;
// }
// 
// // 出现session expired/connection losscase下，会触发所有的watcher响应，同时老的watcher会继续保留，所以会导致出现多次watcher响应
// boolean dataChanged = event.getType() == EventType.NodeDataChanged
// || event.getType() == EventType.NodeDeleted
// || event.getType() == EventType.NodeCreated
// || event.getType() == EventType.NodeChildrenChanged;
// if (dataChanged) {
// syncStage(); // 继续监听
// // initStage(); // 重新更新
// }
// }
// });
// 
// // 3. 循环处理每个process
// List<Long> processIds = new ArrayList<Long>();
// for (String process : currentProcesses) {
// processIds.add(StagePathUtils.getProcessId(process));
// }
// 
// Collections.sort(processIds); // 排序一下
// // 判断一下当前processIds和当前内存中的记录是否有差异，如果有差异立马触发一下
// if (!currentProcessIds.equals(processIds)) {
// initStage(); // 立马触发一下
// }
// } catch (KeeperException e) {
// syncStage(); // 继续监听
// } catch (InterruptedException e) {
// // ignore
// }
// }
/**
 * 监听指定的processId节点的变化
 */
private void syncStage(final Long processId) {
    // 1. 根据pipelineId + processId构造对应的path
    String path = null;
    try {
        path = StagePathUtils.getProcess(getPipelineId(), processId);
        // 2. 监听当前的process列表的变化
        IZkConnection connection = zookeeper.getConnection();
        // zkclient包装的是一个持久化的zk，分布式lock只需要一次性的watcher，需要调用原始的zk链接进行操作
        ZooKeeper orginZk = ((ZooKeeperx) connection).getZookeeper();
        List<String> currentStages = orginZk.getChildren(path, new AsyncWatcher() {

            public void asyncProcess(WatchedEvent event) {
                MDC.put(ArbitrateConstants.splitPipelineLogFileKey, String.valueOf(getPipelineId()));
                if (isStop()) {
                    return;
                }
                if (event.getType() == EventType.NodeDeleted) {
                    // 触发下节点删除
                    processTermined(processId);
                    return;
                }
                // 出现session expired/connection losscase下，会触发所有的watcher响应，同时老的watcher会继续保留，所以会导致出现多次watcher响应
                boolean dataChanged = event.getType() == EventType.NodeDataChanged || event.getType() == EventType.NodeDeleted || event.getType() == EventType.NodeCreated || event.getType() == EventType.NodeChildrenChanged;
                if (dataChanged) {
                    // boolean reply = initStage(processId);
                    // if (reply == false) {// 出现过load后就不需要再监听变化，剩下的就是节点的删除操作
                    syncStage(processId);
                // }
                }
            }
        });
        Collections.sort(currentStages, new StageComparator());
        List<String> lastStages = this.currentStages.get(processId);
        if (lastStages == null || !lastStages.equals(currentStages)) {
            // 存在差异，立马触发一下
            initProcessStage(processId);
        }
    } catch (NoNodeException e) {
        // 触发下节点删除
        processTermined(processId);
    } catch (KeeperException e) {
        syncStage(processId);
    } catch (InterruptedException e) {
    // ignore
    }
}

Example 4 with IZkConnection

use of org.I0Itec.zkclient.IZkConnection in project otter by alibaba.

the class ArbitrateViewServiceImpl method getNextProcessId.

public Long getNextProcessId(Long channelId, Long pipelineId) {
    String processRoot = ManagePathUtils.getProcessRoot(channelId, pipelineId);
    IZkConnection connection = zookeeper.getConnection();
    // zkclient会将获取stat信息和正常的操作分开，使用原生的zk进行优化
    ZooKeeper orginZk = ((ZooKeeperx) connection).getZookeeper();
    Stat processParentStat = new Stat();
    // 获取所有的process列表
    try {
        orginZk.getChildren(processRoot, false, processParentStat);
        return (Long) ((processParentStat.getCversion() + processParentStat.getNumChildren()) / 2L);
    } catch (Exception e) {
        return -1L;
    }
}

Example 5 with IZkConnection

use of org.I0Itec.zkclient.IZkConnection in project otter by alibaba.

the class ArbitrateViewServiceImpl method getCanalCursor.

public PositionEventData getCanalCursor(String destination, short clientId) {
    String path = String.format(CANAL_CURSOR_PATH, destination, String.valueOf(clientId));
    try {
        IZkConnection connection = zookeeper.getConnection();
        // zkclient会将获取stat信息和正常的操作分开，使用原生的zk进行优化
        ZooKeeper orginZk = ((ZooKeeperx) connection).getZookeeper();
        Stat stat = new Stat();
        byte[] bytes = orginZk.getData(path, false, stat);
        PositionEventData eventData = new PositionEventData();
        eventData.setCreateTime(new Date(stat.getCtime()));
        eventData.setModifiedTime(new Date(stat.getMtime()));
        eventData.setPosition(new String(bytes, "UTF-8"));
        return eventData;
    } catch (Exception e) {
        return null;
    }
}