摘要:
Techniques for deriving a provenance of one or more of a plurality of output data elements generated from a given output port of a PC are provided. At least one dependency function is created that relates the one or more output data elements to a set of one or more input ports of the PC and a corresponding plurality of input data elements. The dependency function comprises an encoding of at least one of one or more temporal filters and one or more sequence filters relating to the plurality of input data elements. The at least one dependency function is stored. A history of stream-level bindings of one or more input streams to one or more input ports of the processing component and one or more output streams from one or more output ports of the processing component is stored. The plurality of input data elements belonging to the one or more input streams and the plurality of output data elements belonging to the one or more output streams are stored. The set of one or more input data elements from the plurality of input data elements are determined that relate to the one or more output data elements in accordance with at least one dependency function and the history of stream-level bindings.
摘要:
Techniques for deriving a provenance of one or more of a plurality of output data elements generated from a given output port of a PC are provided. At least one dependency function is created that relates the one or more output data elements to a set of one or more input ports of the PC and a corresponding plurality of input data elements. The dependency function comprises an encoding of at least one of one or more temporal filters and one or more sequence filters relating to the plurality of input data elements. The at least one dependency function is stored. A history of stream-level bindings of one or more input streams to one or more input ports of the processing component and one or more output streams from one or more output ports of the processing component is stored. The plurality of input data elements belonging to the one or more input streams and the plurality of output data elements belonging to the one or more output streams are stored. The set of one or more input data elements from the plurality of input data elements are determined that relate to the one or more output data elements in accordance with at least one dependency function and the history of stream-level bindings.
摘要:
A system and method for determining data usage based on provenance information, in a stream-processing system, includes progressively setting usage information for output stream data objects (SDOs), determining input SDOs that an output SDO depends on, based on a provenance dependency function; recursively feeding back the usage information for a subset of SDOs that can be discarded; and discarding the subset of SDOs. A system and method for data retention based on usage information, in a stream-processing system, includes managing retention of SDOs by deleting SDOs that are determined to be of null usage; and enhancing retention characteristics of SDOs that are deemed to have usage.
摘要:
A system and method for dynamically building applications for stream processing includes providing processing elements with a flow specification describing each input and a stream description describing each output such that the flow specification indicates a stream or streams which are to be received based on processing information and the stream descriptions indicate the processing information. Processing elements that can be reused are identified by determining equivalence between the processing elements. Processing elements that are new and are not reusable are instantiated in a flow graph. An application is dynamically composed, using the instantiated processing elements by routing available streams to the instantiated processing elements in accordance with the flow specifications.
摘要:
A system and method for dynamically building applications for stream processing includes providing processing elements with a flow specification describing each input and a stream description describing each output such that the flow specification indicates a stream or streams which are to be received based on processing information and the stream descriptions indicate the processing information. Processing elements that can be reused are identified by determining equivalence between the processing elements. Processing elements that are new and are not reusable are instantiated in a flow graph. An application is dynamically composed, using the instantiated processing elements by routing available streams to the instantiated processing elements in accordance with the flow specifications.
摘要:
A publisher-subscriber system includes a broker configured to receive and distribute at least one data stream from publishers to subscribers in accordance with subscriptions. An annotator/classifier is configured to annotate or classify the data stream by employing one or more additional stream-level attributes to create an annotated data stream wherein the annotated data stream applies the stream-level attribute to all messages therein such that subscribers can subscribe to the annotated data stream created by the annotator/classifier.
摘要:
A publisher-subscriber system includes a broker configured to receive and distribute at least one data stream from publishers to subscribers in accordance with subscriptions. An annotator/classifier is configured to annotate or classify the data stream by employing one or more additional stream-level attributes to create an annotated data stream wherein the annotated data stream applies the stream-level attribute to all messages therein. Subscribers can subscribe to the annotated data stream created by the annotator/classifier.
摘要:
Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.
摘要:
A resource-efficient live streaming system includes a broadcaster and a streaming server. The broadcaster receives a live feed and broadcasts a media stream to the streaming server containing several descriptions of the live feed along with control information. The broadcaster includes a stream thinner that implements a pruning algorithm. If descriptions from different streams are similar enough, one or more of them may be discarded without penalizing the quality of service perceived by the receivers. The streaming server assembles compressed data units into streams according to the control information from the broadcaster. The streaming server may also gather client feedback in order to estimate the status of the transmission channels and forwards the information to the broadcaster. The streaming server builds and streams media information to clients according to user preferences and receiver capabilities.
摘要:
A system and method for dynamically building applications for stream processing includes providing processing elements with a flow specification describing each input and a stream description describing each output such that the flow specification indicates a stream or streams which are to be received based on processing information and the stream descriptions indicate the processing information. Processing elements that can be reused are identified by determining equivalence between the processing elements. Processing elements that are new and are not reusable are instantiated in a flow graph. An application is dynamically composed, using the instantiated processing elements by routing available streams to the instantiated processing elements in accordance with the flow specifications.