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> ## Common Client Interface

> This section describes how components use the Connector architecture Common Client Interface (CCI) API and a resource adapter to access data from an EIS.

> Defined by the J2EE Connector architecture specification, the CCI defines a set of interfaces and classes whose methods allow a client to perform typical data access operations. The CCI interfaces and classes are as follows:

> - `ConnectionFactory`: Provides an application component with a `Connection` instance to an EIS.
> - `Connection`: Represents the connection to the underlying EIS.
> - `ConnectionSpec`: Provides a means for an application component to pass connection-request-specific properties to the `ConnectionFactory` when making a connection request.
> - `Interaction`: Provides a means for an application component to execute EIS functions, such as database stored procedures.
> - `InteractionSpec`: Holds properties pertaining to an application component's interaction with an EIS.
> - `Record`: The superclass for the various kinds of record instances. Record instances can be `MappedRecord`, `IndexedRecord`, or `ResultSet` instances, all of which inherit from the `Record` interface.
> - `RecordFactory`: Provides an application component with a `Record` instance.
> - `IndexedRecord`: Represents an ordered collection of `Record` instances based on the `java.util.List` interface.

> A client or application component that uses the CCI to interact with an underlying EIS does so in a prescribed manner. The component must establish a connection to the EIS's resource manager, and it does so using the `ConnectionFactory`. The `Connection` object represents the actual connection to the EIS and is used for subsequent interactions with the EIS.

> The component performs its interactions with the EIS, such as accessing data from a specific table, using an `Interaction` object. The application component defines the `Interaction` object using an `InteractionSpec` object. When the application component reads data from the EIS (such as from database tables) or writes to those tables, it does so using a particular type of `Record` instance: either a `MappedRecord`, an `IndexedRecord`, or a `ResultSet` instance. Just as the `ConnectionFactory` creates `Connection` instances, a `RecordFactory` creates `Record` instances.

> Note, too, that a client application that relies on a CCI resource adapter is very much like any other J2EE client that uses enterprise bean methods.

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