Examples of org.apache.curator.framework.CuratorFramework.checkExists()

Class org.apache.curator.framework.CuratorFramework

Examples of org.apache.curator.framework.CuratorFramework.checkExists()

org.apache.curator.framework.CuratorFramework.checkExists()
Start an exists builder
The builder will return a Stat object as if org.apache.zookeeper.ZooKeeper.exists() were called. Thus, a null means that it does not exist and an actual Stat object means it does exist. @return builder object

                public void process(WatchedEvent arg0)
                {
                    semaphore.release();
                }
            };
            client.checkExists().usingWatcher(watcher).forPath(PATH);
            node.setData("b".getBytes());
            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            Assert.assertEquals(node.getActualPath(), PATH);
            Assert.assertEquals(client.getData().usingWatcher(watcher).forPath(PATH), "b".getBytes());
            node.setData("c".getBytes());

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            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            Assert.assertEquals(node.getActualPath(), PATH);
            Assert.assertEquals(client.getData().usingWatcher(watcher).forPath(PATH), "c".getBytes());
            node.close();
            Assert.assertTrue(timing.acquireSemaphore(semaphore));
            Assert.assertTrue(client.checkExists().forPath(PATH) == null);
        }
        finally
        {
            if ( node != null )
            {

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            node.waitForInitialCreate(5, TimeUnit.SECONDS);
            assertNodeExists(observer, node.getActualPath());


            // Register a watch that will fire when the node is deleted...
            Trigger deletedTrigger = Trigger.deleted();
            observer.checkExists().usingWatcher(deletedTrigger).forPath(node.getActualPath());


            killSession(curator);


            // Make sure the node got deleted
            assertTrue(deletedTrigger.firedWithin(10, TimeUnit.SECONDS));

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        {
            node.waitForInitialCreate(5, TimeUnit.SECONDS);
            assertNodeExists(observer, node.getActualPath());


            Trigger deletedTrigger = Trigger.deleted();
            observer.checkExists().usingWatcher(deletedTrigger).forPath(node.getActualPath());


            killSession(curator);


            // Make sure the node got deleted...
            assertTrue(deletedTrigger.firedWithin(10, TimeUnit.SECONDS));

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            // Make sure the node got deleted...
            assertTrue(deletedTrigger.firedWithin(10, TimeUnit.SECONDS));


            // Check for it to be recreated...
            Trigger createdTrigger = Trigger.created();
            Stat stat = observer.checkExists().usingWatcher(createdTrigger).forPath(node.getActualPath());
            assertTrue(stat != null || createdTrigger.firedWithin(10, TimeUnit.SECONDS));
        }
        finally
        {
            node.close();

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            // We should be able to disconnect multiple times and each time the node should be recreated.
            for ( int i = 0; i < 5; i++ )
            {
                Trigger deletionTrigger = Trigger.deleted();
                observer.checkExists().usingWatcher(deletionTrigger).forPath(path);


                // Kill the session, thus cleaning up the node...
                killSession(curator);


                // Make sure the node ended up getting deleted...

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                // Make sure the node ended up getting deleted...
                assertTrue(deletionTrigger.firedWithin(10, TimeUnit.SECONDS));


                // Now put a watch in the background looking to see if it gets created...
                Trigger creationTrigger = Trigger.created();
                Stat stat = observer.checkExists().usingWatcher(creationTrigger).forPath(path);
                assertTrue(stat != null || creationTrigger.firedWithin(10, TimeUnit.SECONDS));
            }
        }
        finally
        {

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            curator.delete().forPath(originalNode);


            // Since we're using an ephemeral node, and the original session hasn't been interrupted the name of the new
            // node that gets created is going to be exactly the same as the original.
            Trigger createdWatchTrigger = Trigger.created();
            Stat stat = curator.checkExists().usingWatcher(createdWatchTrigger).forPath(originalNode);
            assertTrue(stat != null || createdWatchTrigger.firedWithin(10, TimeUnit.SECONDS));
        }
        finally
        {
            node.close();

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                    }
                }
            };
            client.getConnectionStateListenable().addListener(listener);


            client.checkExists().forPath("/");


            server.close();


            Assert.assertTrue(timing.awaitLatch(lostLatch));

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            Assert.assertTrue(timing.awaitLatch(lostLatch));


            try
            {
                client.checkExists().forPath("/");
                Assert.fail();
            }
            catch ( KeeperException.ConnectionLossException e )
            {
                // correct

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