JSRs: Java Specification Requests
JSR 138: Performance Metric Instrumentation
This JSR has been Withdrawn
Submitting Member: David Clay, Oracle Corporation
Name of Contact Person: David Clay, Oracle Corporation
E-Mail Address: email@example.com
Telephone Number: 503-525-8018
Fax Number: 503-790-9074
Specification Lead: Bruce Irvin
E-Mail Address: firstname.lastname@example.org
Telephone Number: 503-525-8027
Fax Number: 503-790-9074
Initial Expert Group Membership:
Bruce Irvin, Oracle Corporation
Section 2: Request
2.1 Please describe the proposed Specification:Programmers frequently add counters, timers, and application data loggers to their code in order to isolate logic or performance problems. There is no standard way of doing this, it is reinvented for every application. Among the problems the programmer faces are:
2.2 What is the target Java platform? (i.e., desktop, server, personal, embedded, card, etc.)Any.
2.3 What need of the Java community will be addressed by the proposed specification?The primary goal of DMS is to allow developers to write as little code as possible to solve a very common problem.
2.4 Why isn't this need met by existing specifications?There is no existing specification which deals specifically with program instrumentation. However, there are specifications which are complementary with DMS, and integration with these will be addressed in the DMS specification. These specifications deal with means for outputting DMS gathered statistics. It is proposed that DMS use
The Java Logging API (JSR 47), is an important integration point because applications may wish to log performance data collected using DMS. Note, however, that it is not the case that every DMS event should be logged; e.g., it may be sufficient to periodically log the number of occurrences of an event.
The Java Management API (JMX), defines interfaces for publishing data from managed applications to management applications (MBeans). The DMS specification will illustrate the use of MBeans for providing access to DMS statistics.
2.5 Please give a short description of the underlying technology or technologies:An application begins by defining a hierarchical measurement framework, similar to a file directory structure. At the leaf nodes of the structure are sensors, which record application instrumentation data associated with the name. There are different types of sensors, including:
2.6 Is there a proposed package name for the API Specification? (i.e., javapi.something, org.something, etc.)java.util.dms
2.7 Does the proposed specification have any dependencies on specific operating systems, CPUs, or I/O devices that you know of?No.
2.8 Are there any security issues that cannot be addressed by the current security model?No.
2.9 Are there any internationalization or localization issues?No.
2.10 Are there any existing specifications that might be rendered obsolete, deprecated, or in need of revision as a result of this work?No.
2.11 Please describe the anticipated schedule for the development of this specification.
Section 3: Contributions
3.1 Please list any existing documents, specifications, or implementations that describe the technology. Please include links to the documents if they are publicly available.Java Documentation for DMS2
3.2 Explanation of how these items might be used as a starting point for the work.Java documentation of an existing DMS system might be used as a starting point. Existing functional and design specifications are too implementation specific to be of use to the expert group.
Section 4: Additional Information (Optional)
4.1 This section contains any additional information that the submitting Member wishes to include in the JSR.The Oracle DMS system has been in used in Oracle products for about 2 years. It has proved to be popular among developers.