import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
/**
 * Connect to a cassandra cluster at a given host/port
 */
public void connect() {
    try {
        lock.lock();
    } catch (IOException e) {
        throw new IllegalStateException("There appears to be another health check running", e);
    }
    final List<InetSocketAddress> whiteList= new ArrayList<>();
    whiteList.add(new InetSocketAddress(host, port));

    final LoadBalancingPolicy loadBalancingPolicy = new WhiteListPolicy(new RoundRobinPolicy(), whiteList);
    final Cluster.Builder cb = Cluster.builder()
            .addContactPoint(host)
            .withPort(port)
            .withLoadBalancingPolicy(loadBalancingPolicy)
            .withRetryPolicy(retryPolicy);
    if (username != null) {
        cb.withCredentials(username, password);
    }
    cluster = cb.build();
    session = cluster.connect();
    hosts = cluster.getMetadata().getAllHosts();
}
 

import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
public JavaDriverClient(StressSettings settings, String host, int port, EncryptionOptions.ClientEncryptionOptions encryptionOptions)
{
    this.host = host;
    this.port = port;
    this.username = settings.mode.username;
    this.password = settings.mode.password;
    this.authProvider = settings.mode.authProvider;
    this.encryptionOptions = encryptionOptions;
    if (settings.node.isWhiteList)
        whitelist = new WhiteListPolicy(new DCAwareRoundRobinPolicy(), settings.node.resolveAll(settings.port.nativePort));
    else
        whitelist = null;
}
 

import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
public JavaDriverClient(StressSettings settings, String host, int port, EncryptionOptions.ClientEncryptionOptions encryptionOptions)
{
    this.protocolVersion = settings.mode.protocolVersion;
    this.host = host;
    this.port = port;
    this.username = settings.mode.username;
    this.password = settings.mode.password;
    this.authProvider = settings.mode.authProvider;
    this.encryptionOptions = encryptionOptions;
    if (settings.node.isWhiteList)
        whitelist = new WhiteListPolicy(DCAwareRoundRobinPolicy.builder().build(), settings.node.resolveAll(settings.port.nativePort));
    else
        whitelist = null;
    connectionsPerHost = settings.mode.connectionsPerHost == null ? 8 : settings.mode.connectionsPerHost;

    int maxThreadCount = 0;
    if (settings.rate.auto)
        maxThreadCount = settings.rate.maxThreads;
    else
        maxThreadCount = settings.rate.threadCount;

    //Always allow enough pending requests so every thread can have a request pending
    //See https://issues.apache.org/jira/browse/CASSANDRA-7217
    int requestsPerConnection = (maxThreadCount / connectionsPerHost) + connectionsPerHost;

    maxPendingPerConnection = settings.mode.maxPendingPerConnection == null ? Math.max(128, requestsPerConnection ) : settings.mode.maxPendingPerConnection;
}
 

import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
@Test
public void buildsPolicy() throws Exception {
    final WhiteListPolicyFactory factory = new WhiteListPolicyFactory();
    factory.setSubPolicy(subPolicyFactory);
    factory.setWhiteList(Collections.singletonList(new InetSocketAddress("localhost", 9876)));

    final WhiteListPolicy policy = (WhiteListPolicy) factory.build();

    assertThat(policy.getChildPolicy()).isSameAs(subPolicy);
}
 

import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
public JavaDriverClient(StressSettings settings, String host, int port, EncryptionOptions.ClientEncryptionOptions encryptionOptions)
{
    this.host = host;
    this.port = port;
    this.encryptionOptions = encryptionOptions;
    if (settings.node.isWhiteList)
        whitelist = new WhiteListPolicy(new DCAwareRoundRobinPolicy(), settings.node.resolveAll(settings.port.nativePort));
    else
        whitelist = null;
}
 

import com.datastax.driver.core.policies.WhiteListPolicy; //导入依赖的package包/类
@Override
public LoadBalancingPolicy build() {
    return new WhiteListPolicy(subPolicy.build(), whiteList);
}