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Event Stream Intelligence: Esper & NEsper

NEsper Change History

This section lists the changes between Esper releases. The changes introduced in each release are split into the following categories.

  • API changes: Any changes to the API that may impact existing users.
  • Major changes: Major new features.
  • Minor changes: Smaller changes and bug fixes.

NEsper 4.1.0

Released April 27, 2011

API changes

  • See Esper version 4.1.0 change description, no major API changes.

Major changes

  • See Esper version 4.1.0 change description
  • Same feature set as Esper 4.1.0

Minor changes

  • none

NEsper 4.0.0

Released January 19, 2011

API changes

  • See Esper version 4.0.0 change description, no major API changes.

Major changes

  • See Esper version 4.0.0 change description
  • Same feature set as Esper 4.0.0

Minor changes

  • none

NEsper 3.4.1

Released October 18, 2010

API changes

  • Enhancements release: Performance changes

Major changes

  • Same featue set as NEsper 3.4.0

Minor changes

  • none

NEsper 3.4.0

Released July 27, 2010

API changes

  • Enhancements release; Esper for .NET - feature equivalent to Esper 3.4.0 with the exception of IO adapters

Major changes

  • All new featues of Esper 3.4
  • The DLL has been split into an API DLL and a runtime DLL: NEsper.dll and NEsper.Runtime.dll

Minor changes

  • none

NEsper 3.3.0

Released March 8, 2010

API changes

  • Enhancements release; Esper for .NET - feature equivalent to Esper 3.3.0

Major changes

  • All changes for Esper 3.3
  • MonitorLock, MonitorSpinLock
    • Default timeout now uses BaseLock.MLockTimeout
    • IDisposable instance is singleton reducing heap fragmentation.
  • HighResolutionPerformanceProvider changed to use double instead of decimal for calculation. Faster performance with no notable degradation.
  • Benchmark performance improved from 1.3 million EPS to 3.6 million EPS.

Minor changes

  • none

NEsper 3.2.1

Released Jan. 26, 2010

API changes

  • Bug fix release; Esper for .NET - feature equivalent to Esper 3.2.0

Major changes

  • Fixed bug ESPER-436.
  • Fixed bug ESPER-437.
  • Fixed bug ESPER-438.
  • Fixed bug ESPER-442.
  • Added BlitReaderWriterLock as a configurable option.

Minor changes

  • none

NEsper 3.2.0

Released Jan. 2, 2010

API changes

  • Esper for .NET - feature equivalent to Esper 3.2.0

Major changes

  • Feature equivalent with Esper 3.2.0

Minor changes

  • see Esper 3.2.0 release notes

NEsper 3.1.0

Released Sept. 15, 2009

API changes

  • Esper for .NET - feature equivalent to Esper 3.1.0

Major changes

  • Feature equivalent with Esper 3.1.0

Minor changes

  • see Esper 3.1.0 release notes

NEsper 3.0.0

Released August 3, 2009

API changes

  • Esper for .NET - feature equivalent to Esper 3.0.0
  • When migrating from NEsper 2.1 to NEsper 3.0, please follow Migrating Esper 2.x to Esper 3
  • The Destroy() method has been changed to Dispose(). Of course this implies that the objects now implement IDisposable ... so if you have language bindings, now you can use them.
  • The statement listeners have been augmented by true EventHandlers (delegates). So you don't need to implement an interface and you don't need to use proxies from previous versions.

Major changes

  • Feature equivalent with Esper 3.0.0
  • XML support is now a part of NEsper. Includes XML schema normalization and XPath.
  • The strict Map requirement has been replaced with a general infrastructure for handling IDictionary - if you choose not to use that structure, but instead use IDictionary it will now do automatic translation under the covers for you.
  • Full support for string indexing was added to NEsper (the Java version doesn't support this).

Minor changes

  • see Esper 3.0.0 release notes

NEsper 2.1.0

Released September 27, 2008

API changes

  • None

Major changes

  • Feature equivalent with Esper 2.1.0

Minor changes

  • None

NEsper 1.12.0 Release Candidate 2

Released June 3, 2008

API changes

  • None

Major changes

  • Feature equivalent with Esper 1.12.0
  • Repackaged to add projects to distribution

Minor changes

  • None

NEsper 1.12.0 Beta 1

Released February 16, 2008

API changes

  • None

Major changes

  • Feature equivalent with Esper 1.12.0
  • Improved support for SQL and database access
  • Includes benchmark kits

Minor changes

  • None

NEsper 1.10.0 Beta 1

Released September 22, 2007

API changes

  • None

Major changes

  • Refactoring effort in Esper between 1.3 and 1.4
  • Refactoring effort in Esper between 1.4 and 1.10
  • Addition of database support to NEsper via ADO.NET
  • Addition of parameter style support do address quirks in the ADO.NET parameter model
  • Addition of dynamic code generation to access properties and fields
  • Conversion of ReaderWriterLock to FastReaderWriterLock -- implementation flaw in CLR
  • Includes NEsperIO as a port of EsperIO 1.10.0

Minor changes

  • None

NEsper 1.3.0 Final

Released June 13, 2007

API changes

  • None

Major changes

  • Conversion of Esper to the CLR.
  • Most of the method names have had their canonization changed to reflect .NET coding conventions.
  • Database support has been dropped in this release until we can address positional parameters in ADO.NET.
  • Many of the interfaces used in Esper have been changed to delegates in NEsper.

Minor changes

  • None

NEsper 1.3.0 Beta 1 - Release Candidate

Released April 28, 2007

API changes

  • None

Major changes

  • None

Minor changes

  • None
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