public ScheduleDataManager4ZK(ZKManager aZkManager) throws Exception {
this.zkManager = aZkManager;
this.gson =
new GsonBuilder()
.registerTypeAdapter(Timestamp.class, new TimestampTypeAdapter())
.setDateFormat(ScheduleUtil.DATA_FORMAT_YYYYMMDDHHMMSS)
.create();
this.pathServer = this.zkManager.getRootPath() + "/" + NODE_SERVER;
this.pathTask = this.zkManager.getRootPath() + "/" + NODE_TASK;
this.random = new Random();
if (this.getZooKeeper().exists(this.pathServer, false) == null) {
ZKTools.createPath(
getZooKeeper(), this.pathServer, CreateMode.PERSISTENT, this.zkManager.getAcl());
}
loclaBaseTime = System.currentTimeMillis();
String tempPath =
this.zkManager
.getZooKeeper()
.create(
this.zkManager.getRootPath() + "/systime",
null,
this.zkManager.getAcl(),
CreateMode.EPHEMERAL_SEQUENTIAL);
Stat tempStat = this.zkManager.getZooKeeper().exists(tempPath, false);
zkBaseTime = tempStat.getCtime();
ZKTools.deleteTree(getZooKeeper(), tempPath);
if (Math.abs(this.zkBaseTime - this.loclaBaseTime) > 5000) {
LOG.error(
"请注意,Zookeeper服务器时间与本地时间相差 ： " + Math.abs(this.zkBaseTime - this.loclaBaseTime) + " ms");
}
}
public static 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());
}
@Override
public void process(WatchedEvent event) {
// this lock is important so that when changes start happening, we
// won't run into any concurrency issues
synchronized (WatchedNode.this) {
if (!cancelled) {
if (event.getState() == KeeperState.SyncConnected) {
// If connected update data and notify listeners
try {
if (event.getType().equals(Event.EventType.NodeCreated)) {
watchForData();
} else if (event.getType().equals(Event.EventType.NodeDeleted)) {
// Previous version notified is null, and we will notify with null
previousVersion = null;
watchForCreation();
} else if (event.getType().equals(Event.EventType.NodeDataChanged)) {
watchForData();
}
} catch (KeeperException e) {
LOG.error("Exception while trying to update our cached value for " + nodePath, e);
} catch (InterruptedException e) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Interrupted while trying to update our cached value for " + nodePath, e);
}
}
// Notify of new value if either we didn't notify of any value, or the node has
// changed
long currentVersion = stat.getCtime() + stat.getMtime();
if (previousVersion == null || !previousVersion.equals(currentVersion)) {
try {
synchronized (listeners) {
for (WatchedNodeListener<T> listener : listeners) {
listener.onWatchedNodeChange(value);
}
}
} finally {
previousVersion = currentVersion;
}
}
} else {
// Not sync connected, do nothing
if (LOG.isDebugEnabled()) {
LOG.debug("Not sync connected anymore for watched node " + nodePath);
}
}
}
}
}
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;
}
}
public static void checkSystemTime(ZooKeeper zooKeeper, long tolerance)
throws KeeperException, InterruptedException, BlurException {
String path =
zooKeeper.create(
"/" + UUID.randomUUID().toString(), null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
long now = System.currentTimeMillis();
Stat stat = zooKeeper.exists(path, false);
zooKeeper.delete(path, -1);
long ctime = stat.getCtime();
long low = now - tolerance;
long high = now + tolerance;
if (!(low <= ctime && ctime <= high)) {
throw new BlurException(
"The system time is too far out of sync with Zookeeper, check your system time and try again.",
null);
}
}