SDMConnectivity Public APIs

Provides a list of public APIs in the SDMConnectivity library.

SDMConnectivity Public APIs

Note: The SAP Mobile Platform APIs and their descriptions are available after the installation of SAP Mobile Platform at the following location within your installation folder: ...\UnwiredPlatform\ClientAPI\apidoc.

The SDMRequestManager class implements the ISDMRequestManager interface, which provides the following methods:

ISDMRequestManager

	 void makeRequest(final ISDMRequest aRequest); 
	 void makeRequest(final ISDMBundleRequest aRequest); 
	 ConnectivityParameters getConnectivityParameter();
	 int getQueueSize();
	 Vector getAllRequests();
     Object getRequest();
     void setMainHandlerClassName(final String classname);
     void terminate();
     boolean hasRequests();
 void sendOnSuccess(final ISDMNetListener listener, final ISDMRequest request, finral HttpResponse response);

The number of working threads in the RequestManager class is configurable via the constructor. The number of threads is maximized by the connectivity layer because of performance related issues. If the client initializes the layer with more than the allowed threads, the implementation of the connectivity layer will decrease the thread number to the max allowed number (4).

Methods defined by the ISDMConnectivityParameters interface: 

SDMConnectivityParameters

	void enableXsrf(Boolean isXsrfEnabled)
    void setUserName(String aUserName);
	String getUserName(); 
	void setUserPassword(String aPassword); 
	String getUserPassword();
	void setBaseUrl(final String url);
	String getBaseUrl();
	String getLanguage();
	void setLanguage(String language); 
	void setServerCertificate(Certificate certificate) throws KeyStoreException;
	final TrustManager[] getTrustManagers();
Sending requests with the connectivity layer consists of the following steps:
  1. Create the RequestManager class and initialize it with the required parameters.
  2. Create the request object. This can be done in the following ways:
    • Implement the ISDMRequest interface.
    • Extend the BaseRequest class, which is the base implementation of the ISDMRequest interface.
    • When the requests’ execution order is important, implement the ISDMBundleRequest, add the ISDMRequest instances into it, then pass this bundle to the request manager. Both of them are provided by the connectivity layer.
  3. Use the request / request bundle object when making a request to the RequestManager.

SDMBundleRequest is a special set of SDMRequest objects. It provides serial processing of the requests when the SDMRequestManager is in multithreaded mode. Because the single SDMRequest objects are processed by multiple threads, the timing of the responses are not consistent. With SDMBundleRequest, one thread processes the bundled requests, guaranteeing that the responses are arriving in the same order as the requests are added to the bundle.

Technical Details

The tasks of the connectivity library have been divided into three main categories:
  • Manage the request queues
  • Manage the reading writing to the input/output streams
  • Manage the platform specific connection creation
The Connectivity component always performs the requests in asynchronous mode. The application’s role is to handle the requests in sync mode. The component is able to perform HTTP and HTTPS requests, which you can use for developing and testing purposes, but the default is SUPRequest. The threads in the connectivity library are responsible for taking the requests from the queue (FIFO - First in first out - algorithm) and performing the requests. The number of working threads in the connection pool can be configured in the connectivity layer. The queue is handled by the SDMRequestManager, and the working threads take the requests from this queue. Applications are interacting only with the SDMRequestManager class; the other components of the connectivity library are not visible to them. The network component consists of three main parts:
  • SDMRequestManager: responsible for queuing the requests, managing the threads and keeping the connection with applications
  • AbstractConnectionHandler: responsible for performing the request
  • ConnectionFactory: responsible for creating and managing platform dependent connections to the server

An application can have more than one SDMRequestManager instances, for example, when connecting to two different servers at the same time. To support this scenario, SDMRequestManager handles ConnectionHandler as a plugin. This kind of plugin needs to implement the ISDMConnectionHandler and implement a constructor taking three parameters: SDMRequestManager, ISDMLogger implementation and ISDMPreferences implementation.

The class name with package is set by SDMRequestManager.setMainHandlerClassName(String), or in SDMPreferences by the ISDMPreferences.SDM_CONNECTIVITY_HANDLER_CLASS_NAME preference key. The default plugin is com.sybase.mobile.lib.client.IMOConnectionHandler, which handles connections through SAP Mobile Platform.

There is built-in support for setting the timeout for the socket connection: the application can use the SDMPreferences object to modify the value, using the following keys:
  • ISDMPreferences.SDM_CONNECTIVITY_CONNTIMEOUT for connection timeout, and
  • ISDMPreferences.SDM_CONNECTIVITY_SCONNTIMEOUT for socket connection timeout.
Parent topic: SDMConnectivity