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| public class TestLock {
ZooKeeper zk;
ZKConf zkConf;
DefaultWatch defaultWatch;
@Before
public void conn(){
zkConf = new ZKConf();
zkConf.setAddress("192.168.163.128:2181,192.168.163.129:2181,192.168.163.130:2181,192.168.163.131:2181/testLock");
zkConf.setSessionTime(1000);
defaultWatch = new DefaultWatch();
ZKUtils.setConf(zkConf);
ZKUtils.setWatch(defaultWatch);
zk = ZKUtils.getZK();
}
@After
public void close(){
ZKUtils.closeZK();
}
@Test
public void testlock(){
for (int i = 0; i < 10; i++) {
new Thread(){
@Override
public void run() {
WatchCallBack watchCallBack = new WatchCallBack();
watchCallBack.setZk(zk);
String name = Thread.currentThread().getName();
watchCallBack.setThreadName(name);
try {
watchCallBack.tryLock();
System.out.println(name + " at work");
watchCallBack.getRootData();
watchCallBack.unLock();
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
while(true){
}
}
}
public class WatchCallBack implements Watcher, AsyncCallback.StringCallback, AsyncCallback.Children2Callback,AsyncCallback.StatCallback,AsyncCallback.DataCallback {
ZooKeeper zk;
CountDownLatch cc = new CountDownLatch(1);
String lockName ;
String threadName;
public String getThreadName() {
return threadName;
}
public void setThreadName(String threadName) {
this.threadName = threadName;
}
public ZooKeeper getZk() {
return zk;
}
public void setZk(ZooKeeper zk) {
this.zk = zk;
}
public void tryLock() {
try {
zk.create("/lock", threadName.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL, this, threadName );
cc.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void getRootData() throws KeeperException, InterruptedException {
byte[] data = zk.getData("/", false, new Stat());
System.out.println(new String(data));
}
public void unLock(){
try {
zk.delete("/"+lockName,-1);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (KeeperException e) {
e.printStackTrace();
}
}
@Override
public void processResult(int rc, String path, Object ctx, List<String> children, Stat stat) {
if(children == null){
System.out.println(ctx.toString() + "list null");
}else{
try {
Collections.sort(children);
int i = children.indexOf(lockName);
if(i<1){
System.out.println(threadName+" i am first...");
zk.setData("/",threadName.getBytes(),-1);
cc.countDown();
}else{
System.out.println(threadName+" watch "+children.get(i-1));
zk.exists("/"+children.get(i-1),this);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void processResult(int rc, String path, Object ctx, String name) {
System.out.println(ctx.toString()+" create path: "+ name);
lockName = name.substring(1);
zk.getChildren("/", false, this, ctx );
}
@Override
public void process(WatchedEvent event) {
Event.EventType type = event.getType();
switch (type) {
case NodeDeleted:
zk.getChildren("/", false, this, "");
break;
case NodeChildrenChanged:
break;
}
}
@Override
public void processResult(int rc, String path, Object ctx, byte[] data, Stat stat) {
}
@Override
public void processResult(int rc, String path, Object ctx, Stat stat) {
}
}
|
