Examples of com.sun.sgs.service.NodeMappingService

com.sun.sgs.service.NodeMappingService
The Node Mapping Service has the following responsibilities:
- maintain mapping of active identities to nodes, and vice versa
- decide when the mapping should change (e.g. when a new client joins the system, a client account is canceled, an AI object is created, node failure, load balancing, an identity is quiescent)
- notify interested services of changes in the mapping
While decisions about changes to the map will be made outside a transaction, the actual mapping change will occur inside a transaction. Services can assume the mapping has not changed during one of their own transactions.
On initial client login, the {@link ClientSessionService} will get anode assignment via {@link #assignNode assignNode}. If the assigned node is the current node (as determined by the nodeId), the client will proceed with the login protocol. Otherwise, the client will get a login response indicating a redirection, and the client code should attempt to log in at the redirected node.
Mappings will be removed when the system believes an identity has become quiescent, for example when a client logs out and there are no more durable tasks to be run for that client's identity. In order to determine whether an identity is quiescent, services which manage resources being used on an identity's behalf inform this mapping service when the identity is active or inactive on a node by calling {@link #setStatus setStatus}. The node mapping service will use this information for a simple reference counting garbage collection scheme within the map. Status is tracked per node, so services should consider only their local node state when calling setStatus.
TODO We might want a transactional method that returns true if an identity is both assigned to the local node and the local node is alive, as a convenience to other services.
TODO A variation of "assignNode" which adds hints for identities the input might want to colocate with will probably be added later.

            // location of identities for the accesses below
            // node1: 1,4,7,10,13,16,19,22,25,28,31,34
            // node2: 2,5,8,11,14,17,20,23,26,29,32
            // node3: 3,6,9,12,15,18,21,24,27,30,33
            // Actual round robin policy might assign these differently...
            NodeMappingService nms = node1.getNodeMappingService();
            for (int i = 1; i < 35; i++) {
                idents[i] = new DummyIdentity(String.valueOf(i));
                nms.assignNode(this.getClass(), idents[i]);
            }
            
            // Node 1 uses.
            AffinityGraphBuilder builder1 = driver1.getGraphBuilder();
            AccessedObjectsDetailTest detail = new AccessedObjectsDetailTest();

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            // Find the node mapping server
            Field mapServer =
                    NodeMappingServiceImpl.class.getDeclaredField("serverImpl");
            mapServer.setAccessible(true);
            final NodeMappingService nodeMappingService = 
                    serverNode.getNodeMappingService();
            NodeMappingServerImpl nodeMappingServer =
                    (NodeMappingServerImpl) mapServer.get(nodeMappingService);
            
            // Create a new identity and assign it to a node
            // Since there is only 1 app node, it will be assigned to that one
            final Identity id = new IdentityImpl(appName + "_identity");
            nodeMappingService.assignNode(NodeMappingService.class, id);
            System.err.println("AppNode id: "+appNode.getNodeId());


            txnScheduler.runTask(new TestAbstractKernelRunnable() {
                public void run() throws Exception {
                    // See if the right node has the identity
                    long nodeid = nodeMappingService.getNode(id).getId();
                    System.err.println("Identity is on node: "+nodeid);
                    if (nodeid != appNode.getNodeId())
                        fail("Identity is on the wrong node");
                }
            }, taskOwner);

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        for (int i = 0; i < NUM_NODES; i++) {
            SgsTestNode node =  new SgsTestNode(serverNode, null, props);
            additionalNodes[i] = node;
        
            NodeMappingService nmap = node.getNodeMappingService();


            // Add to our test data structures, so we can find these nodes
            // and listeners.
            TestListener listener = new TestListener();        
            nmap.addNodeMappingListener(listener);
            nodeListenerMap.put(node.getNodeId(), listener);
        }
    }

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        ////////     The tests     /////////
    @Test
    public void testConstructor() {
        NodeMappingService nodemap = null;
        try {
            nodemap = 
                new NodeMappingServiceImpl(
                            serviceProps, systemRegistry, txnProxy);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (nodemap != null) { nodemap.shutdown(); }
        }
    }

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        }
    }


    @Test(expected = NullPointerException.class)
    public void testConstructorNullProperties() throws Exception {
        NodeMappingService nodemap = null;
        try {
            nodemap = 
                new NodeMappingServiceImpl(null, systemRegistry, txnProxy);
        } finally {
            if (nodemap != null) { nodemap.shutdown(); }
        }
    }

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        }
    }
    
    @Test(expected = NullPointerException.class)
    public void testConstructorNullProxy() throws Exception {
        NodeMappingService nodemap = null;
        try {
            nodemap = 
              new NodeMappingServiceImpl(serviceProps, systemRegistry, null);
        } finally {
            if (nodemap != null) { nodemap.shutdown(); }
        }
    }

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                    "TestNodeMappingServiceImpl", 
                    serverNode, 
                    SgsTestNode.DummyAppListener.class);
        props.remove(StandardProperties.SERVER_HOST);
  
        NodeMappingService nmap =
            new NodeMappingServiceImpl(props, systemRegistry, txnProxy);
    }

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        new NodeMappingServiceImpl(serviceProps, systemRegistry, txnProxy);  
    }
    
    @Test
    public void testReady() throws Exception {
        NodeMappingService nodemap = null;
        try {
            nodemap = 
                new NodeMappingServiceImpl(
        SgsTestNode.getDefaultProperties(
      "TestNodeMappingServiceImpl", serverNode, null),
        systemRegistry, txnProxy);
            TestListener listener = new TestListener();        
            nodemap.addNodeMappingListener(listener);
            
            // We have NOT called ready yet.
            final Identity id = new IdentityImpl("first");
            nodemap.assignNode(NodeMappingService.class, id);
            
            txnScheduler.runTask(
                new TestAbstractKernelRunnable() {
                    public void run() throws Exception {
                        nodeMappingService.getNode(id);
                    }
                }, taskOwner);
            
            // Ensure the listener has not been called yet.
            assertTrue(listener.isClear());


            nodemap.ready();
            // Listener should be notified
            listener.waitForNotification();
            
            // no old node
            checkIdAdded(listener, id, null);
        } finally {
            if (nodemap != null) { nodemap.shutdown(); }
        }
    }

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            // Find the node mapping server
            Field mapServer =
                    NodeMappingServiceImpl.class.getDeclaredField("serverImpl");
            mapServer.setAccessible(true);
            final NodeMappingService nodeMappingService = 
                    serverNode.getNodeMappingService();
            NodeMappingServerImpl nodeMappingServer =
                    (NodeMappingServerImpl) mapServer.get(nodeMappingService);
            
            // Create a new identity and assign it to a node
            // Since there is only 1 app node, it will be assigned to that one
            final Identity id = new IdentityImpl(appName + "_identity");
            nodeMappingService.assignNode(NodeMappingService.class, id);
            System.err.println("AppNode id: "+appNode.getNodeId());


            txnScheduler.runTask(new TestAbstractKernelRunnable() {
                public void run() throws Exception {
                    // See if the right node has the identity
                    long nodeid = nodeMappingService.getNode(id).getId();
                    System.err.println("Identity is on node: "+nodeid);
                    if (nodeid != appNode.getNodeId())
                        fail("Identity is on the wrong node");
                }
            }, taskOwner);

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com.sun.sgs.test.impl.service.nodemap.TestNodeMappingServiceImpl

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