Hash-table, on the other hand, is available in all JDK releases as early as the version 1. Vector was not chosen because it does not provide the key-value associations and would have required manual search to find the desired source object. The hash-table, on the other hand, has the search functionality and association built-in making it trivial to retrieve the desired source object given its SSRC as the key.
An implementation aspect of the source table needs to be pointed out; it is that the sample implementation suggested rfc distinguishes between the senders and members by maintaining two separate tables. In this package, the source table provided by the session holds the members and there is no separate table for senders. A source attribute ActiveSender is used to distinguish the senders from listeners in the member table.
Functions in Session are provided to get the senders or the members. What constitutes the network interaction can be classified into two distinct processes:. The synchronous interaction with the network is straightforward, this is driven by the application the user of the package and is invoked by calling the Session. The asynchronous interaction , on the other hand, requires the RTP and RTCP receivers to run on separate threads and wait for the packet arrival.
Following the reception of a packet, several tasks are performed among which is posting of the packet arrival event. Using events, the application has the option to ignore a particular event family or subscribe to it. The event model and the object interaction that takes place when asynchronous events occur are described in the Event Model section of this document. This loop is started directly by calling the or using Session. Start method which starts all the receivers. The functionality of sending and receiving RTCP packets is not folded into one class to keep the design modular and simple.
RTCP sender and receiver both have complicated algorithms and to keep the changes in the send RTCP module from effecting the receiver module or vice-versa , these functional modules are implemented as separate encapsulations.
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This was decided upon to keep the overall design in accordance with the design guideline of isolating the package modules from the changes made in other modules, while allowing for extensibility. RTCPThreadHandler class is the parent class, which serves as an intstantiator of the sender and receiver thread classes.
This class has the sole purpose of policing the RTCP sender and receiver threads. Although sending of the RTCP packets is an asynchronous process, the sender thread does not run in an endless loop like the receiver -- the Session has some control over it. Likewise, the RTCP sender stops sending packets after application requests a shutdown by calling the Session. Sending RTCP packets has to follow certain rules and guidelines as dictated by the rfc. The flowchart shown in Figure 2 summarizes the algorithms used in the implementation of the sender.
The thread loop is entered at the top-left and exited at the right.
Java RTP Implementation
This flow depicted in the flow-diagram above implements the BYE back-off algorithm rfc, section 7. After parsing the packet, source table is updated if required and an event is generated for the registered listener. This makes it easy for applications, which do not necessary need to concern themselves with the protocol intricacies, to use this software package and with only a few lines of code, have a fully functional RTP session.
For instance, notice the following sample code. However, for the applications requiring finer control over the RTP session, it is necessary to expose some of the session internals. This allows for applications, requiring distinct level of control, to use the same software package. Session exposes some of the internal functionality, such as, thread handling, source-table modification methods etc.
It was mentioned earlier that when a RTP or RTCP packet arrives, session level state and statistics are updated, furthermore, it is necessary to forward the RTP packets over to the user of the session application or any other class requiring the received RTP packets. To avoid using hard-coded callback functions, an event model was designed which is discussed in the next section.
In the AWT event-model, asynchronous events, such as button-click etc.
A listener is a class which implements an interface specified by the event-model. Likely due to the successful "first-vibes" of our pre-date, we hit it off instantly and have been a couple ever since January 21, Monday Time: February 11, Monday Time: Click here to learn more about bring a friend program Monday, February 11 Who: Click here to learn more about bring a friend program Tuesday, March 5 Who: March 5, Tuesday Time: Solvay Specialty Polymers, a leading global supplier of high-performance polymers, announced a new licensing agreement that enables RTP Company, a custom compounder of engineered thermoplastics, to manufacture and sell RTP custom compounds based on Solvay's ultra-high performance Torlon[R] polyamide-imide PAI polymer.
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