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sharding-jdbc如何配置分析Configuration

sharding-jdbc如何配置分析Configuration,很多新手對(duì)此不是很清楚,為了幫助大家解決這個(gè)難題,下面小編將為大家詳細(xì)講解,有這方面需求的人可以來學(xué)習(xí)下,希望你能有所收獲。

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Sharding核心配置主要如下(官網(wǎng)):

  • 分片規(guī)則

    分片規(guī)則配置的總?cè)肟?。包含?shù)據(jù)源配置、表配置、綁定表配置以及讀寫分離配置等

  • 數(shù)據(jù)源配置

    真實(shí)數(shù)據(jù)源列表

  • 表配置

    邏輯表名稱、數(shù)據(jù)節(jié)點(diǎn)與分表規(guī)則的配置

  • 數(shù)據(jù)節(jié)點(diǎn)配置

    用于配置邏輯表與真實(shí)表的映射關(guān)系??煞譃榫鶆蚍植己妥远x分布兩種形式

  • 分片策略配置

    對(duì)于分片策略存有數(shù)據(jù)源分片策略和表分片策略兩種維度

    • 數(shù)據(jù)源分片策略:

      對(duì)應(yīng)于DatabaseShardingStrategy。用于配置數(shù)據(jù)被分配的目標(biāo)數(shù)據(jù)源

    • 表分片策略
      對(duì)應(yīng)于TableShardingStrategy。用于配置數(shù)據(jù)被分配的目標(biāo)表,該目標(biāo)表存在與該數(shù)據(jù)的目標(biāo)數(shù)據(jù)源內(nèi)。故表分片策略是依賴與數(shù)據(jù)源分片策略的結(jié)果的

  • 自增主鍵生成策略

    通過在客戶端生成自增主鍵替換以數(shù)據(jù)庫原生自增主鍵的方式,做到分布式主鍵無重復(fù)。

接下來對(duì)各個(gè)核心配置進(jìn)行分析:

  1. 以多主多從讀寫分離、表分片為例

    public final class ShardingMasterSlaveConfigurationPrecise implements ExampleConfiguration {
        
        @Override
        public DataSource getDataSource() throws SQLException {
            ShardingRuleConfiguration shardingRuleConfig = new ShardingRuleConfiguration();
            //分片表規(guī)則配置
            shardingRuleConfig.getTableRuleConfigs().add(getOrderTableRuleConfiguration());
            shardingRuleConfig.getTableRuleConfigs().add(getOrderItemTableRuleConfiguration());
            //綁定分片表,主要用來路由
            shardingRuleConfig.getBindingTableGroups().add("t_order, t_order_item");
            //設(shè)置默認(rèn)數(shù)據(jù)源分片策略
            shardingRuleConfig.setDefaultDatabaseShardingStrategyConfig(new StandardShardingStrategyConfiguration("user_id", new PreciseModuloShardingDatabaseAlgorithm()));
            //設(shè)置默認(rèn)表分片策略
            shardingRuleConfig.setDefaultTableShardingStrategyConfig(new StandardShardingStrategyConfiguration("order_id", new PreciseModuloShardingTableAlgorithm()));
            //主從配置,支持多主多從
            shardingRuleConfig.setMasterSlaveRuleConfigs(getMasterSlaveRuleConfigurations());
            //創(chuàng)建ShardingDataSource數(shù)據(jù)源
            return ShardingDataSourceFactory.createDataSource(createDataSourceMap(), shardingRuleConfig, new Properties());
        }
        
        private static TableRuleConfiguration getOrderTableRuleConfiguration() {
            //分片表配置
            TableRuleConfiguration result = new TableRuleConfiguration(/*邏輯表*/"t_order", /*數(shù)據(jù)源名.真實(shí)表*/"ds_${0..1}.t_order_${[0, 1]}");
            //自定義主鍵生成配置
            result.setKeyGeneratorConfig(new KeyGeneratorConfiguration("SNOWFLAKE", "order_id", getProperties()));
            return result;
        }
        
        private static TableRuleConfiguration getOrderItemTableRuleConfiguration() {
            TableRuleConfiguration result = new TableRuleConfiguration("t_order_item", "ds_${0..1}.t_order_item_${[0, 1]}");
            result.setKeyGeneratorConfig(new KeyGeneratorConfiguration("SNOWFLAKE", "order_item_id", getProperties()));
            return result;
        }
        
        private static List<MasterSlaveRuleConfiguration> getMasterSlaveRuleConfigurations() {
            MasterSlaveRuleConfiguration masterSlaveRuleConfig1 = new MasterSlaveRuleConfiguration("ds_0", "demo_ds_master_0", Arrays.asList("demo_ds_master_0_slave_0", "demo_ds_master_0_slave_1"));
            MasterSlaveRuleConfiguration masterSlaveRuleConfig2 = new MasterSlaveRuleConfiguration("ds_1", "demo_ds_master_1", Arrays.asList("demo_ds_master_1_slave_0", "demo_ds_master_1_slave_1"));
            return Lists.newArrayList(masterSlaveRuleConfig1, masterSlaveRuleConfig2);
        }
        
        private static Map<String, DataSource> createDataSourceMap() {
            final Map<String, DataSource> result = new HashMap<>();
            result.put("demo_ds_master_0", DataSourceUtil.createDataSource("demo_ds_master_0"));
            result.put("demo_ds_master_0_slave_0", DataSourceUtil.createDataSource("demo_ds_master_0_slave_0"));
            result.put("demo_ds_master_0_slave_1", DataSourceUtil.createDataSource("demo_ds_master_0_slave_1"));
            result.put("demo_ds_master_1", DataSourceUtil.createDataSource("demo_ds_master_1"));
            result.put("demo_ds_master_1_slave_0", DataSourceUtil.createDataSource("demo_ds_master_1_slave_0"));
            result.put("demo_ds_master_1_slave_1", DataSourceUtil.createDataSource("demo_ds_master_1_slave_1"));
            return result;
        }
        
        private static Properties getProperties() {
            Properties result = new Properties();
            result.setProperty("worker.id", "123");
            return result;
        }
    }

  2. ShardingRuleConfiguration分片規(guī)則核心配置

    @Getter
    @Setter
    public final class ShardingRuleConfiguration implements RuleConfiguration {
        //表規(guī)則配置
        private Collection<TableRuleConfiguration> tableRuleConfigs = new LinkedList<>();
    
        //綁定表配置
        private Collection<String> bindingTableGroups = new LinkedList<>();
    
        //廣播表配置
        private Collection<String> broadcastTables = new LinkedList<>();
    
        //默認(rèn)數(shù)據(jù)源名稱
        private String defaultDataSourceName;
    
        //默認(rèn)分庫策略
        private ShardingStrategyConfiguration defaultDatabaseShardingStrategyConfig;
    
        //默認(rèn)分片策略
        private ShardingStrategyConfiguration defaultTableShardingStrategyConfig;
    
        //默認(rèn)主鍵生成工具類
        private KeyGeneratorConfiguration defaultKeyGeneratorConfig;
    
        //主從規(guī)則配置
        private Collection<MasterSlaveRuleConfiguration> masterSlaveRuleConfigs = new LinkedList<>();
    
        //數(shù)據(jù)脫敏規(guī)則配置
        private EncryptRuleConfiguration encryptRuleConfig;
    }

     

  3. 分析ShardingDataSourceFactory#createDataSource中的ShardingRule配置

    /**
     * Sharding data source factory.
     * 
     * @author zhangliang 
     */
    @NoArgsConstructor(access = AccessLevel.PRIVATE)
    public final class ShardingDataSourceFactory {
        
        /**
         * Create sharding data source.
         *
         * @param dataSourceMap data source map
         * @param shardingRuleConfig rule configuration for databases and tables sharding
         * @param props properties for data source
         * @return sharding data source
         * @throws SQLException SQL exception
         */
        public static DataSource createDataSource(
                final Map<String, DataSource> dataSourceMap, final ShardingRuleConfiguration shardingRuleConfig, final Properties props) throws SQLException {
            //創(chuàng)建ShardingDataSource數(shù)據(jù)源,同時(shí)創(chuàng)建sharding rule配置
            return new ShardingDataSource(dataSourceMap, new ShardingRule(shardingRuleConfig, dataSourceMap.keySet()), props);
        }
    }


     

  4. ShardingRule分片規(guī)則

    public ShardingRule(final ShardingRuleConfiguration shardingRuleConfig, final Collection<String> dataSourceNames) {
            Preconditions.checkArgument(null != shardingRuleConfig, "ShardingRuleConfig cannot be null.");
            Preconditions.checkArgument(null != dataSourceNames && !dataSourceNames.isEmpty(), "Data sources cannot be empty.");
            this.shardingRuleConfig = shardingRuleConfig;
            //sharding數(shù)據(jù)源名稱
            shardingDataSourceNames = new ShardingDataSourceNames(shardingRuleConfig, dataSourceNames);
            //創(chuàng)建表規(guī)則集合
            tableRules = createTableRules(shardingRuleConfig);
            //創(chuàng)建分組綁定表
            //1.從tableRules查找
            //2.是否廣播表,如果是廣播表,dataSourceNames.size() == 1 ? dataSourceNames.iterator().next() : shardingRuleConfig.getDefaultDataSourceName();
            //3.已上兩種情況都不滿足,則使用默認(rèn)數(shù)據(jù)源創(chuàng)建tableRule
            bindingTableRules = createBindingTableRules(shardingRuleConfig.getBindingTableGroups());
            //廣播表
            broadcastTables = shardingRuleConfig.getBroadcastTables();
            //默認(rèn)分庫策略
            defaultDatabaseShardingStrategy = createDefaultShardingStrategy(shardingRuleConfig.getDefaultDatabaseShardingStrategyConfig());
            //默認(rèn)表分片策略
            defaultTableShardingStrategy = createDefaultShardingStrategy(shardingRuleConfig.getDefaultTableShardingStrategyConfig());
            //默認(rèn)主鍵生成工具類
            defaultShardingKeyGenerator = createDefaultKeyGenerator(shardingRuleConfig.getDefaultKeyGeneratorConfig());
            //創(chuàng)建主從規(guī)則
            masterSlaveRules = createMasterSlaveRules(shardingRuleConfig.getMasterSlaveRuleConfigs());
            //數(shù)據(jù)脫敏規(guī)則
            encryptRule = createEncryptRule(shardingRuleConfig.getEncryptRuleConfig());
        }

     

  5. TableRule表規(guī)則

    public TableRule(final TableRuleConfiguration tableRuleConfig, final ShardingDataSourceNames shardingDataSourceNames, final String defaultGenerateKeyColumn) {
            //獲取邏輯表
            logicTable = tableRuleConfig.getLogicTable().toLowerCase();
            //inline表達(dá)式解析出真實(shí)表,比如:ds_${0..1}.t_order_${[0, 1]}
            //解析出來為:
            //ds_0.t_order_0
            //ds_0.t_order_1
            //ds_1.t_order_0
            //ds_1.t_order_1
            List<String> dataNodes = new InlineExpressionParser(tableRuleConfig.getActualDataNodes()).splitAndEvaluate();
    
            dataNodeIndexMap = new HashMap<>(dataNodes.size(), 1);
    
            //真實(shí)表數(shù)據(jù)節(jié)點(diǎn)
            //1.如果沒有配置真實(shí)表,則根據(jù)邏輯表、數(shù)據(jù)源來生成對(duì)應(yīng)真實(shí)表數(shù)據(jù)節(jié)點(diǎn)
            //2.否則根據(jù)inline表達(dá)式解析出來的真實(shí)表來生成真實(shí)數(shù)據(jù)節(jié)點(diǎn)
            actualDataNodes = isEmptyDataNodes(dataNodes)
                ? generateDataNodes(tableRuleConfig.getLogicTable(), shardingDataSourceNames.getDataSourceNames()) : generateDataNodes(dataNodes, shardingDataSourceNames.getDataSourceNames());
            //真實(shí)表
            actualTables = getActualTables();
            //數(shù)據(jù)源->分片策略
            databaseShardingStrategy = null == tableRuleConfig.getDatabaseShardingStrategyConfig() ? null : ShardingStrategyFactory.newInstance(tableRuleConfig.getDatabaseShardingStrategyConfig());
            //表->分片策略
            tableShardingStrategy = null == tableRuleConfig.getTableShardingStrategyConfig() ? null : ShardingStrategyFactory.newInstance(tableRuleConfig.getTableShardingStrategyConfig());
            //主鍵字段
            generateKeyColumn = getGenerateKeyColumn(tableRuleConfig.getKeyGeneratorConfig(), defaultGenerateKeyColumn);
            //生成主鍵工具類,比如SNOWFLAKE
            shardingKeyGenerator = containsKeyGeneratorConfiguration(tableRuleConfig)
                    ? new ShardingKeyGeneratorServiceLoader().newService(tableRuleConfig.getKeyGeneratorConfig().getType(), tableRuleConfig.getKeyGeneratorConfig().getProperties()) : null;
        }

     

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