private String __watchStrValueNode(final WatchBag bag) {
StringValueWatcher lw = (StringValueWatcher) bag.watch;
if (lw == null) {
return null;
}
final Watcher w =
new Watcher() {
public void process(org.apache.zookeeper.WatchedEvent we) {
if (we.getState() == Event.KeeperState.Expired) {
handleExpired();
} else if (we.getType() == Event.EventType.NodeDeleted) {
} else if (we.getType() == Event.EventType.NodeCreated) {
if (bag.watch != null) __watchStrValueNode(bag);
} else if (we.getType() == Event.EventType.NodeDataChanged) {
final StringValueWatcher lw = (StringValueWatcher) bag.watch;
if (lw != null) {
final String s = __watchStrValueNode(bag);
if (s != null) {
new Thread(
new Runnable() {
public void run() {
lw.valueChanged(s);
}
},
"StringWatcher-trigger-thread")
.start();
}
}
}
}
};
try {
Stat stat = new Stat();
String ss = new String(zooKeeper.getData(bag.path, w, stat));
if (bag.lastid == stat.getMzxid()) {
log.warn("str watch get a dupmxxid:{}", bag.lastid);
return null;
}
bag.lastid = stat.getMzxid();
return ss;
} catch (KeeperException.ConnectionLossException e) {
log.debug("Str watch ConnectionLossException:{}", bag.path);
this.watchTries.add(
new RetryRun() {
public void run() throws KeeperException, InterruptedException {
if (bag.watch != null) zooKeeper.getData(bag.path, w, null);
}
});
} catch (KeeperException e) {
log.error(" watchStrValueNode KeeperException:{}", bag.path);
} catch (Exception e) {
log.error("watchStrValueNode Exception:{}", e, bag.path);
}
return null;
}
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());
}
/**
* @param path 要Watch的节点的路径
* @param serverAddress：服务器名，如果null，只watch，不set
* @param watch
*/
private final void __watchMaster(final WatchBag bag)
// throws KeeperException, InterruptedException
{
MasterWatcher watch = (MasterWatcher) bag.watch;
if (watch == null) {
return;
}
final InterMasterWatcher iw = new InterMasterWatcher(bag);
iw.path = bag.path;
final Watcher w =
new Watcher() {
public void process(org.apache.zookeeper.WatchedEvent we) {
if (we.getState() == Event.KeeperState.Expired) {
handleExpired();
} else if (we.getType() == Event.EventType.NodeDeleted) {
if (bag.payload == null) {
iw.setMaster(null);
}
watchExecutorService.submit(
new Runnable() {
public void run() {
try {
Thread.currentThread();
Thread.sleep((long) (300));
} catch (InterruptedException e) {
}
__watchMaster(bag);
}
});
// 否则不能删除Cluster
} else if (we.getType() == Event.EventType.NodeCreated) {
__watchMaster(bag);
} else if (we.getType() == Event.EventType.NodeDataChanged) {
__watchMaster(bag);
log.error("Node data should not change:{}", we);
}
}
};
try {
try {
Stat stat = new Stat();
byte[] master = this.zooKeeper.getData(bag.path, false, stat);
if (stat.getMzxid() == bag.lastid) {
log.warn("master watch Get a dupmxxid:{}", bag.lastid);
}
bag.lastid = stat.getMzxid();
iw.setMaster(new String(master));
} catch (KeeperException.NoNodeException e) {
String serverAddress = bag.payload;
if (serverAddress != null) {
try {
this.zooKeeper.create(
bag.path,
serverAddress.getBytes(),
ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL);
iw.setMaster(serverAddress);
} catch (KeeperException.NodeExistsException ee) {
// 刚才没有，现在有了，zk会触发的，所以忽略
} catch (KeeperException.NoNodeException ee) {
// 没有父节点，在删除schema
watch.exceptionCaught(ee);
}
} else {
iw.setMaster(null);
}
}
} catch (Exception e) {
log.error("Error while get Master", e);
// System.exit(-1);
watch.exceptionCaught(e);
}
try {
this.zooKeeper.exists(bag.path, w);
} catch (KeeperException.ConnectionLossException e) {
this.watchTries.add(
new RetryRun() {
public void run() throws KeeperException, InterruptedException {
zooKeeper.exists(bag.path, w);
}
});
} catch (Exception ex) {
log.warn("ZK Error while watch Master", ex);
}
}
private long __watchLongValueNode(final WatchBag bag) {
LongValueWatcher lw = (LongValueWatcher) bag.watch;
if (lw == null) {
return Long.MAX_VALUE;
}
final Watcher w =
new Watcher() {
public void process(org.apache.zookeeper.WatchedEvent we) {
// System.out.println(we);
if (we.getState() == Event.KeeperState.Expired) {
handleExpired();
} else if (we.getType() == Event.EventType.NodeDeleted) {
log.warn("NodeDeleted:{}", bag.path);
} else if (we.getType() == Event.EventType.NodeCreated) {
if (bag.watch != null) {
__watchLongValueNode(bag);
}
} else if (we.getType() == Event.EventType.NodeDataChanged) {
final LongValueWatcher lw = (LongValueWatcher) bag.watch;
if (lw != null) {
final long lv = __watchLongValueNode(bag);
if (lv != Long.MAX_VALUE) {
new Thread(
new Runnable() {
public void run() {
lw.valueChanged(lv);
}
},
"LongWatcher-trigger-thread")
.start();
}
}
}
}
};
try {
Stat stat = new Stat();
String s = new String(this.zooKeeper.getData(bag.path, w, stat));
if (bag.lastid == stat.getMzxid()) {
log.warn("long watch get a dupmxxid:{}", bag.lastid);
return Long.MAX_VALUE;
}
bag.lastid = stat.getMzxid();
long lv = Long.parseLong(s);
return lv;
} catch (KeeperException.ConnectionLossException e) {
log.debug("ConnectionLossException{}", bag.path);
this.watchTries.add(
new RetryRun() {
public void run() throws KeeperException, InterruptedException {
if (bag.watch != null) zooKeeper.getData(bag.path, w, null);
}
});
} catch (KeeperException e) {
log.error("KeeperException:{}", bag.path);
} catch (InterruptedException e) {
log.error("watchTimeNode InterruptedException:{}", bag.path);
} catch (NumberFormatException e) {
log.error("watchTimeNode NumberFormatException:{}", bag.path);
} catch (Exception e) {
log.error("watchTimeNode Exception:{}", e, bag.path);
}
return Long.MAX_VALUE;
}