Package org.eclipse.emf.cdo.server.db.mapping

Interface IMappingStrategy

  • All Known Subinterfaces:
    IMappingStrategy2
    public interface IMappingStrategy
    The mapping strategy acts as a connection between the DBStore and the database management (and OR-mapping) classes. The DBStore uses methods of this interface to create and lookup mappings (or mappers, as they could also be named as such) and to get properties and informations about the mappings used. The mapping classes (e.g., instances of IClassMapping and IListMapping) also use this class as a central point of information and as a resource of common functionalities.
    Since:
    2.0
    Author:
    Eike Stepper, Stefan Winkler

    • Field Detail

      • PROP_MAX_TABLE_NAME_LENGTH

        @Deprecated
static final java.lang.String PROP_MAX_TABLE_NAME_LENGTH
        Deprecated.
        As of 4.4 use IMappingStrategy.Props.MAX_TABLE_NAME_LENGTH.
        Name of the integer property that configures the maximum length for table names. A value of zero indicates the value of the db adapter to be used.
        See Also:
        Constant Field Values

      • PROP_MAX_FIELD_NAME_LENGTH

        @Deprecated
static final java.lang.String PROP_MAX_FIELD_NAME_LENGTH
        Deprecated.
        As of 4.4 use IMappingStrategy.Props.MAX_FIELD_NAME_LENGTH.
        Name of the integer property that configures the maximum length for column names. A value of zero indicates the value of the db adapter to be used.
        See Also:
        Constant Field Values

      • PROP_QUALIFIED_NAMES

        @Deprecated
static final java.lang.String PROP_QUALIFIED_NAMES
        Deprecated.
        As of 4.4 use IMappingStrategy.Props.QUALIFIED_NAMES.
        Name of the boolean property that configures whether the table names are made of simple class names or of qualified class names.
        See Also:
        Constant Field Values

      • PROP_FORCE_NAMES_WITH_ID

        @Deprecated
static final java.lang.String PROP_FORCE_NAMES_WITH_ID
        Deprecated.
        As of 4.4 use IMappingStrategy.Props.FORCE_NAMES_WITH_ID.
        Name of the boolean property that configures whether table names and column names are always suffixed with the internal DBID or only in cases where generated names violate the naming constraints of the underlying backend.
        See Also:
        Constant Field Values

      • PROP_OBJECT_TYPE_CACHE_SIZE

        @Deprecated
static final java.lang.String PROP_OBJECT_TYPE_CACHE_SIZE
        Deprecated.
        As of 4.4 use IMappingStrategy.Props.OBJECT_TYPE_CACHE_SIZE.
        Name of the integer property that configures the size of the object type in-memory cache. Possible configuration values are:
        • 0 (zero). Don't use memory caching.
        • >0. Use memory caching with the cache size given.
        Default is a memory cache size of 10,000,000.

        Since:
        4.0
        See Also:
        Constant Field Values

    • Method Detail

      • getStore

        IDBStore getStore()
        Returns:
        the store, this MappingStrategy instance belongs to.

      • setStore

        void setStore​(IDBStore dbStore)
        Set the store to which this MappingStrategy instance belongs. Should only be called by the DBStore, and only once to initialize the connection between DBStore and mapping strategy.
        Parameters:
        dbStore - the DBStore instance to which this MappingStrategy instance belongs.

      • createValueMapping

        ITypeMapping createValueMapping​(EStructuralFeature feature)
        Factory for value mappings of single-valued attributes.
        Parameters:
        feature - the feature for which a mapping should be created. It must hold feature.isMany() == false.
        Returns:
        the mapping created.

      • createListMapping

        IListMapping createListMapping​(EClass containingClass,
                               EStructuralFeature feature)
        Factory for value mappings of multi-valued-attributes.
        Parameters:
        containingClass - the class containing the feature.
        feature - the feature for which a mapping should be created. It must hold feature.isMany() == true.

      • getTableName

        java.lang.String getTableName​(ENamedElement element)
        Create a suitable table name which can be used to map the given element. Should only be called by mapping classes.
        Parameters:
        element - the element for which the name should be created. It must hold: element instanceof EClass || element instanceof EPackage.
        Returns:
        the created table name. It is guaranteed that the table name is compatible with the chosen database.

      • getTableName

        java.lang.String getTableName​(EClass containingClass,
                              EStructuralFeature feature)
        Create a suitable table name which can be used to map the given element. Should only be called by mapping classes. Should only be called by mapping classes.
        Parameters:
        containingClass - the class containeng the feature.
        feature - the feature for which the table name should be created.
        Returns:
        the created table name. It is guaranteed that the table name is compatible with the chosen database.

      • getFieldName

        java.lang.String getFieldName​(EStructuralFeature feature)
        Create a suitable column name which can be used to map the given element. Should only be called by mapping classes.
        Parameters:
        feature - the feature for which the column name should be created.
        Returns:
        the created column name. It is guaranteed that the name is compatible with the chosen database.

      • createMapping

        void createMapping​(java.sql.Connection connection,
                   InternalCDOPackageUnit[] packageUnits,
                   org.eclipse.net4j.util.om.monitor.OMMonitor monitor)
        Create and initialize the mapping infrastructure for the given packages. Should be called from the DBStore or the DBStoreAccessor.
        Parameters:
        connection - the connection to use.
        packageUnits - the packages whose elements should be mapped.
        monitor - the monitor to report progress.

      • removeMapping

        void removeMapping​(java.sql.Connection connection,
                   InternalCDOPackageUnit[] packageUnits)
        Remove the mapping infrastructure for the given packages. Should be called from the DBStore or the DBStoreAccessor.
        Parameters:
        connection - the connection to use.
        packageUnits - the packages for which the mappings should be removed
        Since:
        4.0

      • getClassMappings

        java.util.Map<EClass,​IClassMapping> getClassMappings()
        Returns all class mappings of this strategy.
        Since:
        4.0

      • getClassMappings

        java.util.Map<EClass,​IClassMapping> getClassMappings​(boolean createOnDemand)
        Returns all class mappings of this strategy.
        Since:
        4.0

      • hasDeltaSupport

        boolean hasDeltaSupport()
        Query if this mapping supports revision deltas.
        If this method returns true, it is guaranteed that all class mappings returned by getClassMapping(EClass) implement IClassMappingDeltaSupport.
        Returns:
        true if revision deltas are supported, false else.

      • hasAuditSupport

        boolean hasAuditSupport()
        Query if this mapping supports audits.
        If this method returns true, it is guaranteed that all class mappings returned by getClassMapping(EClass) implement IClassMappingAuditSupport.
        Returns:
        true if audits are supported, false else.

      • hasBranchingSupport

        boolean hasBranchingSupport()
        Query if this mapping supports branches.
        Returns:
        true if branches are supported, false else.
        Since:
        3.0

      • queryResources

        void queryResources​(IDBStoreAccessor accessor,
                    IStoreAccessor.QueryResourcesContext context)
        Executes a resource query.
        Parameters:
        accessor - the accessor to use.
        context - the context from which the query parameters are read and to which the result is written.

      • queryXRefs

        void queryXRefs​(IDBStoreAccessor accessor,
                IStoreAccessor.QueryXRefsContext context)
        Executes a cross reference query.
        Parameters:
        accessor - the accessor to use.
        context - the context from which the query parameters are read and to which the result is written.
        Since:
        3.0

      • readObjectType

        CDOClassifierRef readObjectType​(IDBStoreAccessor accessor,
                                CDOID id)
        Read the type (i.e. class) of the object referred to by a given ID.
        Parameters:
        accessor - the accessor to use to look up the type.
        id - the ID of the object for which the type is to be determined.
        Returns:
        the type of the object.

      • readObjectIDs

        org.eclipse.net4j.util.collection.CloseableIterator<CDOID> readObjectIDs​(IDBStoreAccessor accessor)
        Get an iterator over all instances of objects in the store.
        Parameters:
        accessor - the accessor to use.
        Returns:
        the iterator.

      • repairAfterCrash

        void repairAfterCrash​(org.eclipse.net4j.db.IDBAdapter dbAdapter,
                      java.sql.Connection connection)
        Return the maximum object id used in the store. This is used by the DBStore if a previous crash is discovered during the startup process. Should only be called by the DBStore and only during startup.
        Parameters:
        dbAdapter - the dbAdapter to use to access the database
        connection - the connection to use to access the database
        Since:
        4.0

      • getProperties

        java.util.Map<java.lang.String,​java.lang.String> getProperties()
        Returns the configuration properties of this mapping strategy.
        Since:
        4.0

      • setProperties

        void setProperties​(java.util.Map<java.lang.String,​java.lang.String> properties)
        Set configuration properties for this mapping strategy. Should only be called by the factory creating the mapping strategy instance.
        Parameters:
        properties - the configuration properties to set.

      • handleRevisions

        void handleRevisions​(IDBStoreAccessor accessor,
                     EClass eClass,
                     CDOBranch branch,
                     long timeStamp,
                     boolean exactTime,
                     CDORevisionHandler handler)
        Passes all revisions of the store to the handler if all of the following conditions are met:
        • The eClass parameter is null or equal to revision.getEClass().
        • The branch parameter is null or equal to revision.getBranch().
        • The timeStamp parameter is CDOBranchPoint.UNSPECIFIED_DATE or equal to revision.getTimeStamp().
        Since:
        4.0

      • rawExport

        void rawExport​(IDBStoreAccessor accessor,
               CDODataOutput out,
               int lastReplicatedBranchID,
               int lastBranchID,
               long lastReplicatedCommitTime,
               long lastCommitTime)
        throws java.io.IOException
        Throws:
        java.io.IOException
        Since:
        3.0

      • rawImport

        void rawImport​(IDBStoreAccessor accessor,
               CDODataInput in,
               long fromCommitTime,
               long toCommitTime,
               org.eclipse.net4j.util.om.monitor.OMMonitor monitor)
        throws java.io.IOException
        Throws:
        java.io.IOException
        Since:
        4.0

      • getListJoin

        java.lang.String getListJoin​(java.lang.String attrTable,
                             java.lang.String listTable)
        Since:
        4.0