Studio:Transport Server Component

The Host Transport Services

The Host Transport Services define an interface that enables the STRIDE Runtime on your host to send data to and receive data from the target. The STRIDE Transport Server connects the Transport DLL to the STRIDE Runtime running on the host platform, thus providing indirect access to the target from STRIDE Studio, AutoScript, and other STRIDE applications. Several common transports are already supported within the STRIDE Transport Server, including serial and TCP/IP.

The Host Transport Services are defined in "transport.h" and each Transport DLL must implement the interfaces derived from the IStrideTransport class.

Refer to the STRIDE Host Runtime Transport Specification document for a more detailed description of the Host Transport Services.

The Transport Server

The Transport Server is an out-of-process COM server that fields client requests to a target and provides connection management, loopback and diagnostic features. The client communicates to the Transport Server. The Transport Server communicates to the target runtime of a target.

To access the transport server, a client first registers with to it using a process id (PID). This is done transparently for script clients using the script wrapper named STRIDE.transport. In JScript getting ahold of the transport server may be done as follows:

var tpserver = new ActiveXObject("STRIDE.transport");

Transport Server API

This section contains all the applicable API to reference transport server functionality.

transport

This is the root-level object. It provides direct access to the top-level transport objects.

Member	Type	Description
HRESULT Init (   long ProcessId,   boolean pVal )	Method	Method to initialize the transport server.
HRESULT Terminate (   long ProcessId )	Method	Method to terminate the transport server.
Connection	Property, Read-only, Object	The Connection object.

transport._TSEvents

This is an outgoing connection point interface that is optionally implemented by clients that wish to be notified of connection related events.

Member	Type	Description
HRESULT OnConnect (void)	Method	Event method fired when the transport connection state changes from disconnected to connected.
HRESULT OnDisconnect (void)	Method	Event method fired when the transport connection state changes from connected to disconnected.
HRESULT OnEvent (    TSEventType type,    TSEventLevel level,    String message )	Method	Event method fired when there is a reportable event in the transport communication.

transport.Connection

This is the root object for all connection-related functionality.

Member	Type	Description
ActiveTransport	Property, Object	Contains the current active transport object or null if none is active.
boolean Connect (    int timeout [optional],    boolean* stat )	Method	Attempts to create a runtime connection to a target using the active transport. The timeout value (in milliseconds) is passed to the runtime connection request and it fails if timeout is exceeded. Default timeout is 5 seconds (5000). Returns true if connection succeeded, false if either the transport or runtime connection failed.
boolean ConnectAsync (    boolean monitor[optional],    int transportTimeout[optional],    int runtimeTimeout,    boolean* stat )	Method	Makes an asynchronous connection request. A background thread is started to attempt to establish the connection. If monitor is true, the thread will run continuously and attempt to reconnect whenever the connection is lost. If monitor is false (the default) the background thread will exit once a connection is initially established.
Database	Property, Object	Database settings.
boolean Disconnect (    boolean* stat )	Method	Attempts to disconnect the runtime and the transport from the target. Returns true if successfully disconnected.
boolean DisconnectAsync (    boolean* stat )	Method	Initiates the request to disconnect from the target, but does not wait fo an acknowledgement of the disconnect request from runtime. Returns true if disconnect request initiated.
IBlockDataDump	Property, boolean	Turns IBlock dumps on or off. Default is off. If enabled, all IBlocks that are sent and received will be dumped to the STRIDE application log and to a predefined tracepoint.
IsConnected	Property, Read-only, boolean	Contains true if transport server is connected.
Loopback	Property, Object	Loopback settings.
Ping	Property, Object	Ping settings.
Statistics	Property, Object	Statistics settings.
TargetRuntimeVersion	Property, String	Returns the runtime version string.
TransportDataDump	Property, boolean	Turns raw data dumps on or off. Default is off. If enabled, all SLAP messages that are sent and received by the transport will be dumped to the STRIDE application log and to a predefined tracepoint.
Transports	Collection	Collection of transports.
TransportsLocation	Property, String	The current directory for transport DLLs. Changing this value will immediately change the values in the Transports collection and will cause the current connection (if any) to be closed.

transport.Connection.Database

This is the interface for database settings.

Member	Type	Description
IsLoaded	Property, Read-only, boolean	Contains true if the database is loaded.
HRESULT Load (    String FullPath,    boolean stat )	Method	Loads the database.
Path	Property, Read-only, String	Contains the path to the database.
HRESULT Unload (    boolean stat )	Method	Unloads the database.

transport.Connection.Loopback

This is the interface for loopback settings.

Member	Type	Description
DataErrors	Property, Read-only, unsigned long	Contains the number of data errors.
Interval	Property, unsigned long	The interval value in milliseconds.
Sent	Property, Read-only, unsigned long	Contains the number of loopbacks attempted.
HRESULT Start (    boolean* pVal )	Method	Start the loopback processing.
HRESULT Stop (    boolean* pVal )	Method	Stops the loopback processing.
Timeout	Property, unsigned long	The timeout value in milliseconds.
TimeoutErrors	Property, Read-only, unsigned long	Contains the number of timeout errors.

transport.Connection.Ping

This is the interface for ping settings. All ping settings are automatically persisted in the registry and restored when the transport server is instantiated.

Member	Type	Description
Enabled	Property, boolean	Runtime switch to turn ping messages on or off. This setting is persisted and restored automatically.
Interval	Property, int	The time interval between ping messages, in milliseconds.
RetryCount	Property, int	The number of allowable ping failures. Once this number if exceeded, the connection will be closed automatically.
Timeout	Property, int	The timeout value for the ping message in milliseconds. If a response is not received within this time, the ping fails.

transport.Connection.Statistics

This is the interface for statistic settings.

Member	Type	Description
IBlocks	Collection	Collection of IBlock statistics.
SequenceErrors	Collection	Collection of Sequence Errors statistics.
TargetResources	Collection	Collection of Target Resource statistics.

transport.Connection.Statistics.IBlocks

This is the interface for IBlock settings.

Member	Type	Description
Sent	Property, Read-only, unsigned long	The number of IBlocks sent.
Received	Property, Read-only, unsigned long	The number of IBlocks received.
HRESULT Reset (void)	Method	Resets the counts to zero.

transport.Connection.Statistics.SequenceErrors

This is the interface for sequence error settings.

Member	Type	Description
Host	Property, Read-only, unsigned long	Number of Host errors.
HRESULT Reset (void)	Method	Resets the host/target sequence error counts.
Target	Property, Read-only, unsigned long	Number of Target errors.
HRESULT Update (void)	Method	Updates the host/target error counts.

transport.Connection.Statistics.TargetResources

This is the interface for the target resource settings

Member	Type	Description
EmbeddedPointers	Property, Read-only, unsigned long	Contains the number of embedded pointers.
MessageQueue	Property, Read-only, unsigned long	Contains the number of message queues.
HRESULT Reset (void)	Method	Resets the counts.
STIDs	Property, Read-only, unsigned long	Contains the number of STIDs.
Subscribers	Property, Read-only, unsigned long	Contains the number of subscribers.
SUIDs	Property, Read-only, unsigned long	Contains the number of SUIDs.
SUIDFilters	Property, Read-only, unsigned long	Contains the number of SUID filters.
SUIDOverrides	Property, Read-only, unsigned long	Contains the number of SUID overrides.
HRESULT Update (void)	Method	Updates the counts to their current value.

transport.Connection.Transports

This is the collection of currently available transports.

Member	Type	Description
int Count (void)	Property, Read-only, int	Gives the number of transport items in the collection.
Transport Item (    int Index )	Method	Returns the specified transport item. Index can be a zero-based integer value or a string representing the name of the transport. Each transport advertises a unique name via its API and that’s what we use as the string keys. As per our usual policy, out-of-range integer indices will generate exceptions and out-of-range string indices will return null.

transport.Connection.Transports.Item

This is the interface associated with each transport object.

Member	Type	Description
Active	Property, boolean	The active status of the transport. Only one transport can be active at any given time, so setting this to true for a transport that is not already active will cause the current active transport to be disconnected. Setting this property to true when the item is already active is a no-op.
File	Property, Read-only, String	The full file path and name for the corresponding transport DLL.
Name	Property, Read-only, String	The name of the transport item.
Properties	Collection	Collection of transport properties for this transport.

transport.Connection.Transports.Properties

This is the collection of properties for a given transport.

Member	Type	Description
int Count (void)	Property, Read-only, int	Gives the number of properties in the collection.
TransportProperty Item (    int Index )	Method	Returns the specified property item. Index can be a zero-based integer value or a string representing the name of the property. As per our usual policy, out-of-range integer indices will generate exceptions and out-of-range string indices will return null.

transport.Connection.Transports.Properties.Item

This is the interface for a specific transport property.

Member	Type	Description
AllowableValues	Property, Read-only, String	A pipe-delimited string where each delimited value represents an allowable value for the property. Clients might use this to restrict or validate input.
Name	Property, Read-only, String	The name of the property item.
Value	Property, String	The value of the property. When set, the validation method of the transport will be called. Any failures in validation will be returned as exceptions here.