Implementation:Apache Shardingsphere MetaDataContextManager Facade

Knowledge Sources	Apache_Shardingsphere
Domains	Mode_Management, Metadata
Last Updated	2026-02-10 00:00 GMT

Overview

Central facade coordinating access to all metadata management sub-managers.

Description

MetaDataContextManager is the top-level coordinator for metadata management operations. It provides access to DatabaseMetaDataManager, DatabaseRuleItemManager, StorageUnitManager, DatabaseRuleConfigurationManager, GlobalConfigurationManager, and StatisticsManager. Dependencies are wired via constructor injection.

Usage

Accessed from ContextManager to perform metadata management operations. Each sub-manager handles a specific domain of metadata operations.

Code Reference

Source Location

• Repository: Apache_Shardingsphere
• File: MetaDataContextManager.java
• Lines: 1-72

Signature

@Getter
public final class MetaDataContextManager {

    private final DatabaseMetaDataManager databaseMetaDataManager;
    private final DatabaseRuleItemManager databaseRuleItemManager;
    private final StorageUnitManager storageUnitManager;
    private final DatabaseRuleConfigurationManager databaseRuleConfigurationManager;
    private final GlobalConfigurationManager globalConfigurationManager;
    private final StatisticsManager statisticsManager;

    public MetaDataContextManager(MetaDataContexts metaDataContexts, MetaDataPersistFacade persistFacade);
}

Import

import org.apache.shardingsphere.mode.metadata.manager.MetaDataContextManager;

I/O Contract

Inputs

Name	Type	Required	Description
metaDataContexts	MetaDataContexts	Yes	Runtime metadata contexts
persistFacade	MetaDataPersistFacade	Yes	Persistence facade for metadata ops

Outputs

Name	Type	Description
getDatabaseMetaDataManager()	DatabaseMetaDataManager	Database/schema metadata manager
getStorageUnitManager()	StorageUnitManager	Storage unit lifecycle manager
getStatisticsManager()	StatisticsManager	Statistics data manager

Usage Examples

MetaDataContextManager manager = contextManager.getMetaDataContextManager();

// Access sub-managers
manager.getDatabaseMetaDataManager().addDatabase("new_db");
manager.getStorageUnitManager().registerStorageUnit("db", switchingResource);
manager.getStatisticsManager().addDatabase("new_db");

Related Pages

• Principle:Apache_Shardingsphere_MetaData_Context_Creation