General kinds of queries between modules. Queries are one way of solving the intermodule communication problem when it is necessary for some modules to obtain basic information about the system (e.g. whether a particular file is intended for version control) without needing direct dependencies on the module providing the answer (e.g. the project type which controls the file). Details are covered in the Javadoc.Question (arch-overall): Describe the overall architecture. Answer: GeneralQueriesAPI - The General Queries API provides generic
queries, or sources of concrete information, useful throughout the build system and perhaps elsewhere. Each query is split into an API component intended for clients to find the answer to a particular question without knowledge of the underlying structure or origin of the answer; and an SPI interface (using lookup) permitting answers to be provided from any source. These queries currently pertain to VCS and compilation status and user visibility of files. Question (arch-usecases): Describe the main use cases of the new API. Who will use it under what circumstances? What kind of code would typically need to be written to use the module? Answer:
Particular use cases are enumerated in the Javadoc for each query API. Usage consists of simple static method calls. Potentially a wide variety of modules could use these queries; implementations are typically registered by project type providers, though also by Java library and platform implementations.Question (arch-time): What are the time estimates of the work? Answer:
Essentially done.Question (arch-quality): How will the quality of your code be tested and how are future regressions going to be prevented? Answer:
All functionality specified in Javadoc should be covered by unit tests. Since query implementations are found in lookup, it is straightforward to register test implementations and confirm that the API produces the correct answer.Question (arch-where): Where one can find sources for your module? Answer:
The sources for the module are in the NetBeans Mercurial repositories.
Uses the NetBeans Filesystems, Lookup and Preferences APIs.
The default answer to this question is:
These modules are required in project.xml:
None.Question (dep-platform): On which platforms does your module run? Does it run in the same way on each? Answer:
Should be platform-independent.Question (dep-jre): Which version of JRE do you need (1.2, 1.3, 1.4, etc.)? Answer:
JRE 1.4+.Question (dep-jrejdk): Do you require the JDK or is the JRE enough? Answer:
Just the JRE.
Just a JAR file.Question (deploy-nbm): Can you deploy an NBM via the Update Center? Answer:
Yes.Question (deploy-shared): Do you need to be installed in the shared location only, or in the user directory only, or can your module be installed anywhere? Answer:
Should work anywhere.Question (deploy-packages): Are packages of your module made inaccessible by not declaring them public? Answer:
Only official API and SPI packages are made public.Question (deploy-dependencies): What do other modules need to do to declare a dependency on this one, in addition to or instead of the normal module dependency declaration (e.g. tokens to require)? Answer: Nothing.
There are no I18N issues in this module.Question (compat-standards): Does the module implement or define any standards? Is the implementation exact or does it deviate somehow? Answer:
There are no known relevant standards.Question (compat-version): Can your module coexist with earlier and future versions of itself? Can you correctly read all old settings? Will future versions be able to read your current settings? Can you read or politely ignore settings stored by a future version? Answer:
The module uses NbPreferences to store the default project encoding. When there is no default project encoding stored it falls back to UTF-8.Question (compat-deprecation): How the introduction of your project influences functionality provided by previous version of the product? Answer:
Addition of a new API.
File directly as they only make sense for disk files and need to
work with paths of nonexistent files.
No.Question (resources-read): Does your module read any resources from layers? For what purpose? Answer:
No.Question (resources-mask): Does your module mask/hide/override any resources provided by other modules in their layers? Answer:
No.Question (resources-preferences): Does your module uses preferences via Preferences API? Does your module use NbPreferences or or regular JDK Preferences ? Does it read, write or both ? Does it share preferences with other modules ? If so, then why ? Answer:
The module internally uses
NbPreferences to store the default value of encoding of a new project.
Clients should not access this preferences directly using preferences API but they should use
|Default encoding which should be used for new project
or any similar technology to find any components to communicate with? Which ones?
Yes, query implementations are found via global lookup. Order is significant in case two queries supply different answers; generally the first one wins.Question (lookup-register): Do you register anything into lookup for other code to find? Answer:
None.Question (lookup-remove): Do you remove entries of other modules from lookup? Answer:
On a similar note, is there something interesting that you
java.util.logging.Logger? Or do you observe
what others log?
No.Question (exec-component): Is execution of your code influenced by any (string) property of any of your components? Answer:
No.Question (exec-ant-tasks): Do you define or register any ant tasks that other can use? Answer:
No.Question (exec-classloader): Does your code create its own class loader(s)? Answer:
No.Question (exec-reflection): Does your code use Java Reflection to execute other code? Answer:
No.Question (exec-privateaccess): Are you aware of any other parts of the system calling some of your methods by reflection? Answer:
No.Question (exec-process): Do you execute an external process from your module? How do you ensure that the result is the same on different platforms? Do you parse output? Do you depend on result code? Answer:
No.Question (exec-introspection): Does your module use any kind of runtime type information (
No.Question (exec-threading): What threading models, if any, does your module adhere to? How the project behaves with respect to threading? Answer:
Most general queries should be treated similarly to API and SPI calls in the
FileBuiltQuery is intended to be thread-safe for
No.Question (security-grant): Does your code grant additional rights to some other code? Answer:
None.Question (format-dnd): Which protocols (if any) does your code understand during Drag & Drop? Answer:
None.Question (format-clipboard): Which data flavors (if any) does your code read from or insert to the clipboard (by access to clipboard on means calling methods on
No.Question (perf-exit): Does your module run any code on exit? Answer:
No.Question (perf-scale): Which external criteria influence the performance of your program (size of file in editor, number of files in menu, in source directory, etc.) and how well your code scales? Answer:
Number of query implementations (typically only a few) and their own performance.Question (perf-limit): Are there any hard-coded or practical limits in the number or size of elements your code can handle? Answer:
Performance of queries scales linearly in number of query implementations, but typical implementations are singletons which delegate to other implementations in constant time.Question (perf-mem): How much memory does your component consume? Estimate with a relation to the number of windows, etc. Answer:
Trivial, except in case of
FileBuiltQuery.Status which is
proportional to number of files.
No.Question (perf-progress): Does your module execute any long-running tasks? Answer:
No.Question (perf-huge_dialogs): Does your module contain any dialogs or wizards with a large number of GUI controls such as combo boxes, lists, trees, or text areas? Answer:
No.Question (perf-menus): Does your module use dynamically updated context menus, or context-sensitive actions with complicated and slow enablement logic? Answer:
No.Question (perf-spi): How the performance of the plugged in code will be enforced? Answer:
Query implementations are intended to be fast.