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

Package com.datastax.driver.core.policies

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

com.datastax.driver.core.policies.TokenAwarePolicy
A wrapper load balancing policy that add token awareness to a child policy.
This policy encapsulates another policy. The resulting policy works in the following way:
- the {@code distance} method is inherited from the child policy.
- the iterator return by the {@code newQueryPlan} method will firstreturn the {@code LOCAL} replicas for the query (based on {@link Statement#getRoutingKey}) if possible (i.e. if the query {@code getRoutingKey} methoddoesn't return {@code null} and if {@link Metadata#getReplicas}returns a non empty set of replicas for that partition key). If no local replica can be either found or successfully contacted, the rest of the query plan will fallback to one of the child policy.
Do note that only replica for which the child policy {@code distance}method returns {@code HostDistance.LOCAL} will be considered havingpriority. For example, if you wrap {@link DCAwareRoundRobinPolicy} with thistoken aware policy, replicas from remote data centers may only be returned after all the host of the local data center.

        }
    }


    @Test(groups = "long")
    public void testRFThreeDowngradingCLTwoDCsDCAware() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new DCAwareRoundRobinPolicy("dc2"))).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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    if(localDatacenter != null) {
      logger.info("Creating with DCAwareRoundRobinPolicy: {}", localDatacenter);
      if(loadBalancingPolicy == null) {
        loadBalancingPolicy = new DCAwareRoundRobinPolicy(localDatacenter);
      }
      builder.withLoadBalancingPolicy(new TokenAwarePolicy(loadBalancingPolicy));
    }
    if(this.nativeTransportPort != null) {
      logger.debug("Setting native transport port to {}", this.nativeTransportPort);
      builder.withPort(this.nativeTransportPort);
    }

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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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            break;
        }


        if (loadBalancingPolicy != null && Boolean.valueOf(isTokenAware))
        {
            loadBalancingPolicy = new TokenAwarePolicy(loadBalancingPolicy);
        }
        else if (loadBalancingPolicy != null && Boolean.valueOf(isLatencyAware))
        {
            loadBalancingPolicy = LatencyAwarePolicy.builder(loadBalancingPolicy).build();
        }

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    switch (asConfig.getConnectionPoolType()) {
    case ROUND_ROBIN:
        return new RoundRobinPolicy();
    case TOKEN_AWARE:
        return new TokenAwarePolicy(new RoundRobinPolicy());
    case BAG:
      throw new RuntimeException("Unsupported connection pool type, use ROUND_ROBIN or TOKEN_AWARE");
    default:
      return new RoundRobinPolicy();
    }

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