Examples of com.datastax.driver.core.policies.RoundRobinPolicy

Package com.datastax.driver.core.policies

Examples of com.datastax.driver.core.policies.RoundRobinPolicy

com.datastax.driver.core.policies.RoundRobinPolicy
A Round-robin load balancing policy.
This policy queries nodes in a round-robin fashion. For a given query, if an host fail, the next one (following the round-robin order) is tried, until all hosts have been tried.
This policy is not datacenter aware and will include every known Cassandra host in its round robin algorithm. If you use multiple datacenter this will be inefficient and you will want to use the {@link DCAwareRoundRobinPolicy} load balancing policy instead.

        }
    }


    @Test(groups = "long")
    public void testRFThreeTokenAware() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session, 3);
            init(c, 12, ConsistencyLevel.TWO);

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    }




    @Test(groups = "long")
    public void testRFOneDowngradingCL() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE);
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session, 1);
            init(c, 12, ConsistencyLevel.ONE);

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        }
    }


    @Test(groups = "long")
    public void testRFTwoDowngradingCL() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE);
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session, 2);
            init(c, 12, ConsistencyLevel.TWO);

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        }
    }


    @Test(groups = "long")
    public void testRFThreeRoundRobinDowngradingCL() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new RoundRobinPolicy()).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE);
        testRFThreeDowngradingCL(builder);
    }

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        testRFThreeDowngradingCL(builder);
    }


    @Test(groups = "long")
    public void testRFThreeTokenAwareDowngradingCL() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE);
        testRFThreeDowngradingCL(builder);
    }

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        }
    }


    @Test(groups = "long")
    public void testRFThreeDowngradingCLTwoDCs() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE);
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, 3, builder);
        try {


            createMultiDCSchema(c.session, 3, 3);
            init(c, 12, ConsistencyLevel.TWO);

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    }


    private LoadBalancingPolicy getLoadBalancingPolicy() {
        String policy = System.getProperty(LOAD_BALANCING);
        if (policy == null || policy.equals("RoundRobin")) {
            return new RoundRobinPolicy();
        }
        if (policy.equals("DCAwareRoundRobin")) {
            String dataCenter = System.getProperty(DATA_CENTER);
            if (dataCenter == null) {
                LOG.warn(policy + " was specified for " + LOAD_BALANCING + " but " + DATA_CENTER + " is undefined." +
                    "Reverting to RoundRobin load balancing policy.");
                return new RoundRobinPolicy();
            } else {
                return new DCAwareRoundRobinPolicy(dataCenter);
            }
        }
        LOG.warn(policy + " is not a supported load balancing policy. Reverting to RoundRobin load balancing policy.");


        return new RoundRobinPolicy();
    }

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    }
    @Provides
    @Named("pooledmetacluster")
    Cluster providePooledCluster(@Named("paas.cassclient") String clientType,@Named("paas.metacluster") String clustername) {
        if (clientType.equals("cql")) {
        Cluster cluster = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).addContactPoint(clustername).build();
//        Cluster cluster = Cluster.builder().addContactPoint(clustername).build();
        return cluster;
        }else {
            return null;
        }

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        } else {
            CassandraStorage cassStorage = new CassandraStorage(storageConf);
            if (clientType.equals(CLIENTTYPE.ASTYANAX.getType())) {
                return new AstyanaxCassandraConnection(cassStorage.getCluster(), db, hs);
            } else {
            Cluster cluster = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).addContactPoint(cassStorage.getCluster()).build();
            return new CassandraConnection(cluster);
            }
        }
    }

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    }
    @Provides
    @Named("pooledmetacluster")
    Cluster providePooledCluster(@Named("staash.cassclient") String clientType,@Named("staash.metacluster") String clustername) {
        if (clientType.equals("cql")) {
        Cluster cluster = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy())).addContactPoint(clustername).build();
        return cluster;
        }else {
            return null;
        }
    }

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