Abstract:
Embodiments of the present invention provide a method, system and computer program product for dynamic, granular messaging persistence in a messaging system. In an embodiment of the invention, a method for dynamic, granular messaging persistence in a messaging system is provided. The method includes monitoring operational performance of a message broker and receiving a message for queuing in a message queue of the message broker. The method also includes parsing the message to extract different fields and corresponding priorities and selectively storing in fixed storage, data for corresponding ones of the different fields based upon consideration of corresponding ones of the priorities and the monitored operational performance. Finally, the method includes queuing the message in the message queue.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
       [0001]    The present invention relates to the field of messaging and more particularly to message queue management in a messaging system. 
       Description of the Related Art 
       [0002]    In the field of information technology, messaging refers to the exchange of information between two computing processes. A message can be something as simple as just a few bits of data, or something as robust as an electronic mail message containing embedded multimedia imagery. In its simplest form, a messaging system acts to directly exchange messages between messaging partners. Inter-process communications methods facilitate message passing between processes in a computer communications network. E-mail messaging systems rely upon messaging servers both to transmit and receive messages onto a network, and instant messaging systems moderate and facilitate the exchange of instantaneous messages between chat partners. 
         [0003]    Message queues provide an asynchronous mode of message passing between processes. In a message queuing system, applications can submit messages to a queue for delivery to subscribing clients who can consume the messages in the queue at a later time. To the extent that a uniform message structure can be agreed upon between message provider and message consumer, a message queue can provide an ideal solution for disparate applications seeking to communicate without requiring internal codification for compatibility with one another. 
         [0004]    Modern message queuing systems account for the possibility of the failure of supporting infrastructure such as network communications loss, server crashes and the like. In this regard, current messaging systems enable a delivery model to be specified such that messages that contain critical data are persisted to disk or other forms of reliable storage, such that the message can be recovered and processed following machine reboots and application failures/shutdown. Some messaging systems extend this concept further and provide a message reliability level to provide a finer grained control on the quality of service provided. 
         [0005]    Persisting messages to fixed storage during message queuing, though, can become taxing on the underlying computing infrastructure. Specifically, for a high volume message queue, significant disk storage will be required to persist all affected messages. Further, the act of persisting, retrieving and intelligently purging messages so as to account for the possibility of an infrastructure failure can be time consuming resulting in performance delays. Thus, as the reliability level of a messaging system increases based upon message persistence, processing overhead placed upon the messaging system increases resulting in a reduction in system performance. 
       BRIEF SUMMARY OF THE INVENTION 
       [0006]    Embodiments of the present invention address deficiencies of the art in respect to message persistence in a messaging system and provide a novel and non-obvious method, system and computer program product for dynamic, granular messaging persistence in a messaging system. In an embodiment of the invention, a method for dynamic, granular messaging persistence in a messaging system is provided. The method includes monitoring operational performance of a message broker and receiving a message for queuing in a message queue of the message broker. The method also includes parsing the message to extract different fields and associating these fields with a corresponding priority, either via a message schema or from data contained within the message, and selectively storing in fixed storage, data for corresponding ones of the different fields based upon consideration of corresponding ones of the priorities and the monitored operational performance. Finally, the method includes queuing the message in the message queue. 
         [0007]    In one aspect of the embodiment, the operational performance indicates a degree of resource utilization in a host server hosting the message broker. As such, at least one of the priorities can indicate that data in a corresponding one of the fields is to be persisted in the fixed storage in response to detecting a low degree of resource utilization, but that data in a corresponding one of the fields is not to be persisted in the fixed storage in response to detecting a high degree of resource utilization. Also, at least one of the priorities can indicate that data in a corresponding one of the fields is to be persisted irrespective of a degree of utilization detected for the host server. Further, at least one of the priorities can indicate that data in a corresponding one of the fields is never to be persisted irrespective of a degree of utilization detected for the host server. 
         [0008]    In another embodiment of the invention, a message data processing system can be configured for dynamic, granular messaging persistence. The system can include a host server communicatively linked to client servers over a computer communications network and also fixed storage. The system also can include a message broker executing in memory of the host server and brokering messages in a message queue for the client servers. Finally, the system can include a granular message persistence module coupled to the host server. The module can include program code enabled to monitor operational performance of the message broker, parse a message received for queuing by the message broker in the message queue to extract different fields, associate these fields with corresponding priorities, and selectively store in the fixed storage data for corresponding ones of the different fields based upon consideration of corresponding ones of the priorities and the monitored operational performance. 
         [0009]    Additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The aspects of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0010]    The accompanying drawings, which are incorporated in and constitute part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. The embodiments illustrated herein are presently preferred, it being understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown, wherein: 
           [0011]      FIG. 1  is a pictorial illustration of a process for dynamic, granular messaging persistence in a messaging system; 
           [0012]      FIG. 2  is a schematic illustration of a message data processing system configured for dynamic, granular messaging persistence; and, 
           [0013]      FIG. 3  is a flow chart illustrating a process for dynamic, granular messaging persistence in a messaging system. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0014]    Embodiments of the invention provide for dynamic, granular messaging persistence in a messaging system. In accordance with an embodiment of the invention, messages from message publishers can be queued in a message queue for retrieval by different message consumers. Different messages provided for message queuing in the message queue can be inspected to determine fields of the different messages marked for selective persistence. Thereafter, marked portions of the different messages can be queued according to a measured performance of the messaging system. Specifically, during periods of time when the measured performance of the messaging system is high, both low and high priority fields of the messages can be persisted, while during periods of low performance, only high priority fields of the messages can be persisted. In this way, the goal of accounting for a potential failure in infrastructure of the messaging system can be balanced with the requirement not to overtax the resources of the messaging system. 
         [0015]    In further illustration,  FIG. 1  is a pictorial illustration of a process for dynamic, granular messaging persistence in a messaging system. As shown in  FIG. 1 , a message publisher  110  can publish a message  160  to a message queue  150  of a message server  140  over a computer communications network  130 . A message consumer  120  in turn can retrieve the message  160  from the message queue  150  from over the computer communications network  130 . The message server  140  can be coupled not only to the message queue  150 , but also a message data store  170  into which message data can be stored into fixed storage the persists even subsequent to a reset or power cycle condition in the message server  140 . Further, dynamic granular message persistence logic  100  can execute in memory of the message server  140 . The logic  100  can be enabled to process priority value  180  indicated within the message  160 , or in the alternative in a schema established for the message  160 , and the corresponding message fields  190  from the message  160  in order to determine whether or not to persist data in each of the fields  190  to the message data store  170 . 
         [0016]    In this regard, the message  160  can include different data fields  190 . Each of the data fields  190  can include a corresponding priority  180  indicated within the message  160 , or in the alternative, within a schema defined for the message  160 . The priority  180  can indicate under which circumstance data encapsulated by a corresponding one of the data fields  190  is to be persisted in the message data store  170  concurrently with the placement of the message  160  in the message queue  150 . For example, the priority  180  can provide that under periods of high resource utilization in the message server  140 , data in a corresponding one of the data fields  190  is not persisted to the message data store  170 , but under periods of low resource utilization in the message server  140 , data in a corresponding one of the data fields  190  is to be persisted to the message data store  170 . Alternatively, the priority  180  can provide that data in a corresponding one of the data fields  190  always is to be persisted to the message data store  170  irrespective of resource utilization in the message server  140 , or the priority  180  can provide that data in a corresponding one of the data fields  190  is never to be persisted to the message data store  170  irrespective of resource utilization in the message server  140 . 
         [0017]    The process described in connection with  FIG. 1  can be implemented in a message data processing system. In yet further illustration,  FIG. 2  schematically shows a message data processing system configured for dynamic, granular messaging persistence. The system can include a host server  210  with memory and at least processor coupled to fixed storage  260  such as a fixed disk drive or solid state memory. The host server  210  can be communicatively linked over computer communications network  230  to different client servers  220  supporting different applications executing in memory therein. The host server  210  likewise can host in memory a message broker  240  configured to broker messages  250  from the different applications of the different client servers  220  in a message queue established in memory of the host server  210 . 
         [0018]    Notably, a granular message persistence module  300  can be coupled to the message broker  240 . The module  300  can include program code that when executed in the memory of the host server  210  can be enabled to parse the content of each message  250  published to the message queue of the message broker  240  to identify different fields therein and corresponding priorities. For instance, an exemplary message format can be provided according to the following extensible markup language (XML) schema: 
         [0019]    For example taking a simple XML Schema: 
         [0000]    
       
         
               
             
           
               
                   
               
             
             
               
                 &lt;xsd:schema xmlns:msg=“http://www.ibm.com/mpt/ 
               
               
                 granular/” xmlns:xsd=“http://www.w3.org/2001/XMLSchema” ...&gt; 
               
               
                 &lt;xsd:complexType name=“PolicyType”&gt; 
               
               
                 &lt;xsd:sequence&gt; 
               
               
                 &lt;xsd:element name=“name” type=“xsd:string” persistence= 
               
               
                 “msg:alwaysPersist”/&gt; 
               
               
                 &lt;xsd:element name=“policyNumber” type=“xsd:int” persistence= 
               
               
                 “msg:alwaysPersist”/&gt; 
               
               
                 &lt;xsd:element name=“address” type=“xsd:string” persistence= 
               
               
                 “msg:persistWhenResourcesPermit ”/&gt; 
               
               
                 &lt;xsd:element name=“salary” type=“xsd:string” persistence= 
               
               
                 “msg:neverPersist”/&gt; 
               
               
                 &lt;xsd:element name=“renewalDate” type=“xsd:decimal” persistence= 
               
               
                 “msg:persistWhenResourcesPermit”/&gt; 
               
               
                 &lt;/xsd:sequence&gt; 
               
               
                 &lt;/xsd:complexType&gt; 
               
               
                   
               
             
          
         
       
     
         [0020]    Thus, the priorities can be values or rules indicating under which conditions corresponding fields are to be persisted to the fixed storage  260  in addition to the message queue. 
         [0021]    As such, the program code of the module  300  can be enabled to monitor resource utilization in the host server  210 , for example processor utilization, memory utilization, disk utilization, message traffic or network bandwidth, in order to either apply the rules of the priorities, or to apply rules specified by the module  300  to the values of the priorities. 
         [0022]    In even yet further illustration of the operation of the granular message persistence module  300 ,  FIG. 3  is a flow chart illustrating a process for dynamic, granular messaging persistence in a messaging system. Beginning in block  310 , a message can be received for queuing in a message queue of a message broker. In block  320 , different fields can be extracted from the message and the corresponding priorities obtained from the message or associated schema. In block  330 , the operational performance of the message broker can be monitored to determine resource utilization in the message broker. In block  340 , only selected ones of the fields of the message can be persisted to fixed storage based upon an application of the priorities to the monitored operational performance. Finally, the message can be queued in the message queue. 
         [0023]    As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon. 
         [0024]    Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. 
         [0025]    A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. 
         [0026]    Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radiofrequency, and the like, or any suitable combination of the foregoing. Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language and conventional procedural programming languages. The program code may execute entirely on the user&#39;s computer, partly on the user&#39;s computer, as a stand-alone software package, partly on the user&#39;s computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user&#39;s computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). 
         [0027]    Aspects of the present invention have been described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. In this regard, the flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. For instance, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. 
         [0028]    It also will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
         [0029]    These computer program instructions may also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks. The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
         [0030]    Finally, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
         [0031]    The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated. 
         [0032]    Having thus described the invention of the present application in detail and by reference to embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims as follows: