The API supporting execution of an external process in the IDE.
The support API for processing the growing streams or files.
The support API extending the capabalities of input processing.
The support API allowing client to query the startup extenders.
The support SPI for creation of external processes.
The support SPI for terminating external processes.
The support SPI to allow pluggability of predefined
The support SPI for registration of startup extenders.
The External Execution module provides the ExternalExecutionAPI that contains support for execution of external processes in the IDE. It also provide support class for the actual creation of the external process and support for destroying the process tree. There is also abstraction of process builder.
Another exported API ExternalExecutionInputAPI define interfaces for input processing (character or line based) and provides common implementations of these with factory methods.
Natural extension to input processing API is printing API
that defines interfaces transforming lines to lines printed to
org.openide.windows.OutputWriter. API provides common implementations too.
The SPI ExternalExecutionSPI allows different implementations of process builder.
There is also SPI allowing to register support for destroying the process tree ExternalExecutionDestroySPI.
The ExternalExecutionOpenSPI allows implementation module to determine particular way of file or HTTP URL opening in predefined covertors. It also makes options dialog opening pluggable.
There is also API to provide additional startup arguments to interested clients such as projects and servers ExternalExecutionStartupAPI. Th corresponding SPI for plugins which need to provide such additional arguments is also available as ExternalExecutionStartupSPI.
advised to throw
UserQuestionException in case
they need some interaction with user.
This API/SPI allow splitting the extexecution to real API and implementation classes.
This API/SPI allow third party plugins (such as JRebel) to register extenders of process startup. The interested clients such as projects or servers may optionaly query such extenders and pass additional arguments to the process.
Added configuration method to ExecutionDescriptor to allow opening of output tab on nonzero exit code.
New API/SPI classes to allow different implementations of process builders.
Client needs to execute an external process and handle process streams and display the output in the output tab.
In order to achieve this client creates the ExecutionDescriptor. Via this object client configures all the UI behaviour of the subsequent execution. As a next step client creates the ExecutionService itself and calls run to execute the job. Run can be called multiple times. The output and input streams are presented in output tab. Additional processing and printing conversion can be configured in descriptor through interfaces described in following usecases.
The creation of the external process is supported by ExternalProcessBuilder to make things easier.
Client needs to process character data coming from stream, file or other source.
To abstract the source of the data client must implement InputReader. To abstract the data processing client must implement InputProcessor or LineProcessor. For all three interfaces there are prepared common implementations (and bridge from character based to line based processing) at these three factory classes:
To configure additional functionality specific to
see the next usecase.
Once the data source and processing objects are prepared client creates InputReaderTask. Factory methods of the InputReaderTask can create either common task exiting on interruption or cancellation or draining task which is trying to drain out all available data before exiting.
Client intends to process input lines and print them to
In addition printed lines should be transformed (converted) somehow
and enriched by line listeners.
The both default printing processors provide factory method accepting LineConvertor. Namely InputProcessors.printing(org.openide.windows.OutputWriter out, LineConvertor convertor, boolean resetEnabled) and LineProcessors.printing(org.openide.windows.OutputWriter out, LineConvertor convertor, boolean resetEnabled). Convertor is then used to convert received lines to printed ones. Common convertors (file, http) are provided in factory class LineConvertors.
Third party wants to implement custom process builder to provide additional functionality, such as remote execution.
Client wants to destroy the process, trying to kill whole process tree. Method ExternalProcessSupport.destroy(java.lang.Process process, Map<String,String> env) is designed for that. It will use a ProcessDestroyPerformer registered in default lookup to do so.
The third party plugin may want to be able provide additional arguments for the process startup in a standardized way. In order to do so it will register a implementation of StartupExtenderImplementation to the layer folder StartupExtender. The annotation StartupExtenderImplementation.Registration can be used for that.
The clients (for exmaple project or server) may query the extenders via the API class StartupExtender and use the additional arguments for the process.
Some default LineConvertors returned by LineConvertor needs to open file or URL. A bit special case is also options dialog opening required by ExecutionService to open options dialog specified by ExecutionDescriptor. To cover this three usecases in a pluggable way while keeping dependencies minimal there are three corresponding SPI classes one may implement. So there is FileOpenHandler to handle file opening, HttpOpenHandler to deal with HTTP URLs and OptionOpenHandler to open proper options dialog.
The sources for the module are in the NetBeans Mercurial repositories.
Read more about the implementation in the answers to architecture questions.
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