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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3
(CQL3) and Cassandra's binary protocol.
/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.driver.core;
import com.datastax.driver.core.policies.Policies;
/**
* The configuration of the cluster.
* It configures the following:
*
* - Cassandra protocol level configuration (compression).
* - Connection pooling configurations.
* - low-level TCP configuration options (tcpNoDelay, keepAlive, ...).
* - Metrics related options.
* - Query related options (default consistency level, fetchSize, ...).
* - Netty layer customization options.
*
* This is also where you get the configured policies, though those cannot be changed
* (they are set during the built of the Cluster object).
*/
public class Configuration {
/**
* Returns a builder to create a new {@code Configuration} object.
*
* You only need this if you are building the configuration yourself. If you
* use {@link Cluster#builder()}, it will be done under the hood for you.
*
* @return the builder.
*/
public static Builder builder() {
return new Builder();
}
private final Policies policies;
private final ProtocolOptions protocolOptions;
private final PoolingOptions poolingOptions;
private final SocketOptions socketOptions;
private final MetricsOptions metricsOptions;
private final QueryOptions queryOptions;
private final ThreadingOptions threadingOptions;
private final NettyOptions nettyOptions;
private final CodecRegistry codecRegistry;
private Configuration(Policies policies,
ProtocolOptions protocolOptions,
PoolingOptions poolingOptions,
SocketOptions socketOptions,
MetricsOptions metricsOptions,
QueryOptions queryOptions,
ThreadingOptions threadingOptions,
NettyOptions nettyOptions,
CodecRegistry codecRegistry) {
this.policies = policies;
this.protocolOptions = protocolOptions;
this.poolingOptions = poolingOptions;
this.socketOptions = socketOptions;
this.metricsOptions = metricsOptions;
this.queryOptions = queryOptions;
this.threadingOptions = threadingOptions;
this.nettyOptions = nettyOptions;
this.codecRegistry = codecRegistry;
}
/**
* Copy constructor.
*
* @param toCopy the object to copy from.
*/
protected Configuration(Configuration toCopy) {
this(
toCopy.getPolicies(),
toCopy.getProtocolOptions(),
toCopy.getPoolingOptions(),
toCopy.getSocketOptions(),
toCopy.getMetricsOptions(),
toCopy.getQueryOptions(),
toCopy.getThreadingOptions(),
toCopy.getNettyOptions(),
toCopy.getCodecRegistry()
);
}
void register(Cluster.Manager manager) {
protocolOptions.register(manager);
poolingOptions.register(manager);
queryOptions.register(manager);
}
/**
* Returns the policies set for the cluster.
*
* @return the policies set for the cluster.
*/
public Policies getPolicies() {
return policies;
}
/**
* Returns the low-level TCP configuration options used (tcpNoDelay, keepAlive, ...).
*
* @return the socket options.
*/
public SocketOptions getSocketOptions() {
return socketOptions;
}
/**
* Returns the Cassandra binary protocol level configuration (compression).
*
* @return the protocol options.
*/
public ProtocolOptions getProtocolOptions() {
return protocolOptions;
}
/**
* Returns the connection pooling configuration.
*
* @return the pooling options.
*/
public PoolingOptions getPoolingOptions() {
return poolingOptions;
}
/**
* Returns the metrics configuration, if metrics are enabled.
*
* Metrics collection is enabled by default but can be disabled at cluster
* construction time through {@link Cluster.Builder#withoutMetrics}.
*
* @return the metrics options or {@code null} if metrics are not enabled.
*/
public MetricsOptions getMetricsOptions() {
return metricsOptions;
}
/**
* Returns the queries configuration.
*
* @return the queries options.
*/
public QueryOptions getQueryOptions() {
return queryOptions;
}
/**
* @return the threading options for this configuration.
*/
public ThreadingOptions getThreadingOptions() {
return threadingOptions;
}
/**
* Returns the {@link NettyOptions} instance for this configuration.
*
* @return the {@link NettyOptions} instance for this configuration.
*/
public NettyOptions getNettyOptions() {
return nettyOptions;
}
/**
* Returns the {@link CodecRegistry} instance for this configuration.
*
* Note that this method could return {@link CodecRegistry#DEFAULT_INSTANCE}
* if no specific codec registry has been set on the {@link Cluster}.
* In this case, care should be taken when registering new codecs as they would be
* immediately available to other {@link Cluster} instances sharing the same default instance.
*
* @return the {@link CodecRegistry} instance for this configuration.
*/
public CodecRegistry getCodecRegistry() {
return codecRegistry;
}
/**
* A builder to create a new {@code Configuration} object.
*/
public static class Builder {
private Policies policies;
private ProtocolOptions protocolOptions;
private PoolingOptions poolingOptions;
private SocketOptions socketOptions;
private MetricsOptions metricsOptions;
private QueryOptions queryOptions;
private ThreadingOptions threadingOptions;
private NettyOptions nettyOptions;
private CodecRegistry codecRegistry;
/**
* Sets the policies for this cluster.
*
* @param policies the policies.
* @return this builder.
*/
public Builder withPolicies(Policies policies) {
this.policies = policies;
return this;
}
/**
* Sets the protocol options for this cluster.
*
* @param protocolOptions the protocol options.
* @return this builder.
*/
public Builder withProtocolOptions(ProtocolOptions protocolOptions) {
this.protocolOptions = protocolOptions;
return this;
}
/**
* Sets the pooling options for this cluster.
*
* @param poolingOptions the pooling options.
* @return this builder.
*/
public Builder withPoolingOptions(PoolingOptions poolingOptions) {
this.poolingOptions = poolingOptions;
return this;
}
/**
* Sets the socket options for this cluster.
*
* @param socketOptions the socket options.
* @return this builder.
*/
public Builder withSocketOptions(SocketOptions socketOptions) {
this.socketOptions = socketOptions;
return this;
}
/**
* Sets the metrics options for this cluster.
*
* If this method doesn't get called, the configuration will use the
* defaults: metrics enabled with JMX reporting enabled.
* To disable metrics, call this method with an instance where
* {@link MetricsOptions#isEnabled() isEnabled()} returns false.
*
* @param metricsOptions the metrics options.
* @return this builder.
*/
public Builder withMetricsOptions(MetricsOptions metricsOptions) {
this.metricsOptions = metricsOptions;
return this;
}
/**
* Sets the query options for this cluster.
*
* @param queryOptions the query options.
* @return this builder.
*/
public Builder withQueryOptions(QueryOptions queryOptions) {
this.queryOptions = queryOptions;
return this;
}
/**
* Sets the threading options for this cluster.
*
* @param threadingOptions the threading options to set.
* @return this builder.
*/
public Builder withThreadingOptions(ThreadingOptions threadingOptions) {
this.threadingOptions = threadingOptions;
return this;
}
/**
* Sets the Netty options for this cluster.
*
* @param nettyOptions the Netty options.
* @return this builder.
*/
public Builder withNettyOptions(NettyOptions nettyOptions) {
this.nettyOptions = nettyOptions;
return this;
}
/**
* Sets the codec registry for this cluster.
*
* @param codecRegistry the codec registry.
* @return this builder.
*/
public Builder withCodecRegistry(CodecRegistry codecRegistry) {
this.codecRegistry = codecRegistry;
return this;
}
/**
* Builds the final object from this builder.
*
* Any field that hasn't been set explicitly will get its default value.
*
* @return the object.
*/
public Configuration build() {
return new Configuration(
policies != null ? policies : Policies.builder().build(),
protocolOptions != null ? protocolOptions : new ProtocolOptions(),
poolingOptions != null ? poolingOptions : new PoolingOptions(),
socketOptions != null ? socketOptions : new SocketOptions(),
metricsOptions != null ? metricsOptions : new MetricsOptions(),
queryOptions != null ? queryOptions : new QueryOptions(),
threadingOptions != null ? threadingOptions : new ThreadingOptions(),
nettyOptions != null ? nettyOptions : NettyOptions.DEFAULT_INSTANCE,
codecRegistry != null ? codecRegistry : CodecRegistry.DEFAULT_INSTANCE);
}
}
}