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85 lines
3.2 KiB
JavaScript
85 lines
3.2 KiB
JavaScript
2 years ago
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/*
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* Copyright DataStax, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* Contains driver tuning policies to determine [load balancing]{@link module:policies/loadBalancing},
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* [retrying]{@link module:policies/retry} queries, [reconnecting]{@link module:policies/reconnection} to a node,
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* [address resolution]{@link module:policies/addressResolution},
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* [timestamp generation]{@link module:policies/timestampGeneration} and
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* [speculative execution]{@link module:policies/speculativeExecution}.
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* @module policies
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*/
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const addressResolution = exports.addressResolution = require('./address-resolution');
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const loadBalancing = exports.loadBalancing = require('./load-balancing');
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const reconnection = exports.reconnection = require('./reconnection');
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const retry = exports.retry = require('./retry');
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const speculativeExecution = exports.speculativeExecution = require('./speculative-execution');
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const timestampGeneration = exports.timestampGeneration = require('./timestamp-generation');
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/**
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* Returns a new instance of the default address translator policy used by the driver.
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* @returns {AddressTranslator}
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*/
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exports.defaultAddressTranslator = function () {
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return new addressResolution.AddressTranslator();
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};
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/**
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* Returns a new instance of the default load-balancing policy used by the driver.
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* @param {string} [localDc] When provided, it sets the data center that is going to be used as local for the
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* load-balancing policy instance.
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* <p>When localDc is undefined, the load-balancing policy instance will use the <code>localDataCenter</code>
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* provided in the {@link ClientOptions}.</p>
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* @returns {LoadBalancingPolicy}
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*/
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exports.defaultLoadBalancingPolicy = function (localDc) {
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return new loadBalancing.DefaultLoadBalancingPolicy(localDc);
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};
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/**
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* Returns a new instance of the default retry policy used by the driver.
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* @returns {RetryPolicy}
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*/
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exports.defaultRetryPolicy = function () {
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return new retry.RetryPolicy();
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};
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/**
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* Returns a new instance of the default reconnection policy used by the driver.
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* @returns {ReconnectionPolicy}
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*/
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exports.defaultReconnectionPolicy = function () {
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return new reconnection.ExponentialReconnectionPolicy(1000, 10 * 60 * 1000, false);
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};
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/**
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* Returns a new instance of the default speculative execution policy used by the driver.
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* @returns {SpeculativeExecutionPolicy}
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*/
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exports.defaultSpeculativeExecutionPolicy = function () {
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return new speculativeExecution.NoSpeculativeExecutionPolicy();
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};
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/**
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* Returns a new instance of the default timestamp generator used by the driver.
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* @returns {TimestampGenerator}
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*/
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exports.defaultTimestampGenerator = function () {
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return new timestampGeneration.MonotonicTimestampGenerator();
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};
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