Examples of org.apache.zookeeper_voltpatches.ZooKeeper

Package org.apache.zookeeper_voltpatches

Examples of org.apache.zookeeper_voltpatches.ZooKeeper

org.apache.zookeeper_voltpatches.ZooKeeper
This is the main class of ZooKeeper client library. To use a ZooKeeper service, an application must first instantiate an object of ZooKeeper class. All the iterations will be done by calling the methods of ZooKeeper class. The methods of this class are thread-safe unless otherwise noted.
Once a connection to a server is established, a session ID is assigned to the client. The client will send heart beats to the server periodically to keep the session valid.
The application can call ZooKeeper APIs through a client as long as the session ID of the client remains valid.
If for some reason, the client fails to send heart beats to the server for a prolonged period of time (exceeding the sessionTimeout value, for instance), the server will expire the session, and the session ID will become invalid. The client object will no longer be usable. To make ZooKeeper API calls, the application must create a new client object.
If the ZooKeeper server the client currently connects to fails or otherwise does not respond, the client will automatically try to connect to another server before its session ID expires. If successful, the application can continue to use the client.
Some successful ZooKeeper API calls can leave watches on the "data nodes" in the ZooKeeper server. Other successful ZooKeeper API calls can trigger those watches. Once a watch is triggered, an event will be delivered to the client which left the watch at the first place. Each watch can be triggered only once. Thus, up to one event will be delivered to a client for every watch it leaves.
A client needs an object of a class implementing Watcher interface for processing the events delivered to the client. When a client drops current connection and re-connects to a server, all the existing watches are considered as being triggered but the undelivered events are lost. To emulate this, the client will generate a special event to tell the event handler a connection has been dropped. This special event has type EventNone and state sKeeperStateDisconnected.

    }


    @Test
    public void testDeleteChildWithCallback() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache02", zk);


        TestCallback cb = new TestCallback();
        MapCache dut = new MapCache(zk, "/cache02", cb);
        dut.start(true);
        Map<String, JSONObject> cache = cb.m_cache;
        assertEquals("3 items cached.", 3, cache.size());


        zk.delete("/cache02/bb", -1);
        while(true) {
            cache = cb.m_cache;
            if (cache.size() == 3) {
                Thread.sleep(1);
            }
            else {
                break;
            }
        }
        assertEquals("Item removed", 2, cache.size());
        assertEquals(null, cache.get("/cache02/bb"));
        assertEquals("aaval", cache.get("/cache02/aa").get("key"));
        assertEquals("ccval", cache.get("/cache02/cc").get("key"));


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testAddChildWithPut() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache04", zk);


        MapCache dut = new MapCache(zk, "/cache04");
        dut.start(true);
        Map<String, JSONObject> cache = dut.pointInTimeCache();


        JSONObject dd = new JSONObject("{key:ddval}");
        dut.put("dd", dd);


        while(true) {
            cache = dut.pointInTimeCache();
            if (cache.size() == 3) {
                Thread.sleep(1);
            }
            else {
                break;
            }
        }
        assertEquals("Item added", 4, cache.size());
        assertEquals("aaval", cache.get("/cache04/aa").get("key"));
        assertEquals("bbval", cache.get("/cache04/bb").get("key"));
        assertEquals("ccval", cache.get("/cache04/cc").get("key"));
        assertEquals("ddval", cache.get("/cache04/dd").get("key"));


        // modify the new child and make sure it has a watch set.
        JSONObject dd2 = new JSONObject("{key:ddval2}");
        dut.put("dd", dd2);
        while(true) {
            cache = dut.pointInTimeCache();
            if (cache.get("/cache04/dd").get("key").equals("ddval2")) {
                break;
            }
        }
        assertEquals("Items accounted for.", 4, cache.size());
        assertEquals("ddval2", cache.get("/cache04/dd").get("key"));


        dut.shutdown();
        zk.close();
    }

View Full Code Here

    }


    @Test
    public void testAddChildWithPutWithCallback() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache04", zk);


        TestCallback cb = new TestCallback();
        MapCache dut = new MapCache(zk, "/cache04", cb);
        dut.start(true);
        Map<String, JSONObject> cache = cb.m_cache;


        JSONObject dd = new JSONObject("{key:ddval}");
        dut.put("dd", dd);


        while(true) {
            cache = cb.m_cache;
            if (cache.size() == 3) {
                Thread.sleep(1);
            }
            else {
                break;
            }
        }
        assertEquals("Item added", 4, cache.size());
        assertEquals("aaval", cache.get("/cache04/aa").get("key"));
        assertEquals("bbval", cache.get("/cache04/bb").get("key"));
        assertEquals("ccval", cache.get("/cache04/cc").get("key"));
        assertEquals("ddval", cache.get("/cache04/dd").get("key"));


        // modify the new child and make sure it has a watch set.
        JSONObject dd2 = new JSONObject("{key:ddval2}");
        dut.put("dd", dd2);
        while(true) {
            cache = cb.m_cache;
            if (cache.get("/cache04/dd").get("key").equals("ddval2")) {
                break;
            }
        }
        assertEquals("Items accounted for.", 4, cache.size());
        assertEquals("ddval2", cache.get("/cache04/dd").get("key"));


        dut.shutdown();
        zk.close();
    }

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    /*
     * Inherit the per partition txnid from the long since gone
     * partition that existed in the past
     */
    private long[] fetchPerPartitionTxnId() {
        ZooKeeper zk = VoltDB.instance().getHostMessenger().getZK();
        byte partitionTxnIdsBytes[] = null;
        try {
            partitionTxnIdsBytes = zk.getData(VoltZK.perPartitionTxnIds, false, null);
        } catch (KeeperException.NoNodeException e){return null;}//Can be no node if the cluster was never restored
        catch (Exception e) {
            VoltDB.crashLocalVoltDB("Error retrieving per partition txn ids", true, e);
        }
        ByteBuffer buf = ByteBuffer.wrap(partitionTxnIdsBytes);

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        assertTrue(results.length == 1);


        loadSomeData(client, 65, 5);


        //Check that if a catalog update blocker exists the catalog update fails
        ZooKeeper zk = ZKUtil.getClient(((LocalCluster) m_config).zkinterface(0), 10000, new HashSet<Long>());
        final String catalogUpdateBlockerPath = zk.create(
                VoltZK.elasticJoinActiveBlocker,
                null,
                ZooDefs.Ids.OPEN_ACL_UNSAFE,
                CreateMode.EPHEMERAL_SEQUENTIAL );
        try {
            /*
             * Update the catalog and expect failure
             */
            newCatalogURL = Configuration.getPathToCatalogForTest("catalogupdate-cluster-base.jar");
            deploymentURL = Configuration.getPathToCatalogForTest("catalogupdate-cluster-base.xml");
            boolean threw = false;
            try {
                client.updateApplicationCatalog(new File(newCatalogURL), new File(deploymentURL));
            } catch (ProcCallException e) {
                e.printStackTrace();
                threw = true;
            }
            assertTrue(threw);
        }
        finally {
            zk.delete(catalogUpdateBlockerPath, -1);
        }


        //Expect success
        client.updateApplicationCatalog(new File(newCatalogURL), new File(deploymentURL));

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Related Classes of org.apache.zookeeper_voltpatches.ZooKeeper

org.apache.zookeeper_voltpatches.proto.CreateRequest

org.apache.zookeeper_voltpatches.proto.CreateResponse

org.apache.zookeeper_voltpatches.proto.DeleteRequest

org.apache.zookeeper_voltpatches.proto.ExistsRequest

org.apache.zookeeper_voltpatches.proto.GetACLRequest

org.apache.zookeeper_voltpatches.proto.GetACLResponse

org.apache.zookeeper_voltpatches.proto.GetChildren2Request

org.apache.zookeeper_voltpatches.proto.GetChildren2Response

org.apache.zookeeper_voltpatches.proto.GetChildrenRequest

org.apache.zookeeper_voltpatches.proto.GetChildrenResponse

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