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<?xml version="1.0" encoding="UTF-8"?>
<!--
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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-->
<!DOCTYPE api-answers PUBLIC "-//NetBeans//DTD Arch Answers//EN" "../nbbuild/antsrc/org/netbeans/nbbuild/Arch.dtd" [
<!ENTITY api-questions SYSTEM "../nbbuild/antsrc/org/netbeans/nbbuild/Arch-api-questions.xml">
]>
<api-answers
question-version="1.25"
author="mkleint@netbeans.org"
>
&api-questions;
<!--
<question id="arch-overall" when="init">
Describe the overall architecture.
<hint>
What will be API for
<a href="http://openide.netbeans.org/tutorial/api-design.html#design.apiandspi">
clients and what support API</a>?
What parts will be pluggable?
How will plug-ins be registered? Please use <code><api type="export"/></code>
to describe your general APIs.
If possible please provide
simple diagrams.
</hint>
</question>
-->
<answer id="arch-overall">
<p>
The module will be autoload.
There is an api module and a pluggable implementation.
<api name="Progress" group="java" type="export" category="official"
url="@org-netbeans-api-progress@/index.html"/>
</p>
</answer>
<!--
<question id="arch-quality" when="init">
How will the <a href="http://www.netbeans.org/community/guidelines/q-evangelism.html">quality</a>
of your code be tested and
how are future regressions going to be prevented?
<hint>
What kind of testing do
you want to use? How much functionality, in which areas,
should be covered by the tests?
</hint>
</question>
-->
<answer id="arch-quality">
<p>
There are unit tests of API methods and assertions for proper use of the API.
</p>
</answer>
<!--
<question id="arch-time" when="init">
What are the time estimates of the work?
<hint>
Please express your estimates of how long the design, implementation,
stabilization are likely to last. How many people will be needed to
implement this and what is the expected milestone by which the work should be
ready?
</hint>
</question>
-->
<answer id="arch-time">
<p>
1-1.5 man/month
</p>
</answer>
<!--
<question id="arch-usecases" when="init">
<hint>
Content of this answer will be displayed as part of page at
http://www.netbeans.org/download/dev/javadoc/usecases.html
You can use tags <usecase name="name> regular html description </usecase>
and if you want to use an URL you can prefix if with @TOP@ to begin
at the root of your javadoc
</hint>
Describe the main <a href="http://openide.netbeans.org/tutorial/api-design.html#usecase">
use cases</a> 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?
</question>
-->
<answer id="arch-usecases">
<usecase id="basic" name="Basic usage" >
<p>There are 3 types of progress indication:</p>
<ul>
<li>1. indefinite when it's not known how much time will be needed to complete</li>
<li>2. definite with time estimate for completion (UI shows time that remains)</li>
<li>3. definite without time estimate where the UI shows percentage completed.</li>
</ul>
<p>
The default location of the progress indication is the status bar which aggregates all
tasks running in the IDE that show progress. However it's possible to exclude the task from the default location
and show the progress in one's custom dialog component. In such a case the same task should not appear in the status line component as well.
</p>
<p>
It's possible to request cancelling the task from status line progress aggregator if the task allows cancelling.
</p>
<p>
Progress tasks that get started as a result of explicit user action takes precedence in the status line
docked component over tasks that are triggered by the system. (say filesystem refresh for example)
</p>
<p> The most common usecase of the API looks like this: </p>
<pre>
ProgressHandle handle = ProgressHandleFactory.creatHandle("My custom task");
...
// we have 100 workunits
// at this point the task appears in status bar.
handle.start(100);
...
handle.progress(10);
...
handle.progress("half way through", 50);
...
handle.progress(99);
// at this point the task is finished and removed from status bar
// it's not realy necessary to count all the way to the limit, finish can be called earlier.
// however it has to be called at the end of the processing.
handle.finish();
</pre>
</usecase>
<usecase id="advanced" name="Advanced Usage" >
<p>In case your usage of the API </p>
<ul>
<li>spans across multiple independent modules, </li>
<li>requires adjusting of number of workunits or </li>
<li>triggers additional action based on the current progress</li>
</ul>
<p>
then you should consider using the aggregating version of APIs which is similar to the
simple APIs but has distinctive differences and additions that allow for more complex scenarios.
</p>
<p>
It allows to compose the progress bar from 1+ independent sources, all sharing proportional piece
of the progress bar. Additionally you can monitor the task's overall progress from one central place and possibly
add more contributing sources of the progress during processing.
</p>
<pre>
// let's have a factory for client code that performs some part of the job to be done..
Lookup.Result res = Lookup.getDefault().lookup(new LookupTemplate(MyWorkerFactory.class));
Iterator it = res.allInstances().iterator();
ProgressContributor[] contribs = new ProgressContributor[res.allInstances().size()];
int i = 0;
while (it.hasNext()) {
MyWorkerFactory prov = (MyWorkerFactory)it.next();
contribs[i] = AggregateProgressFactory.createProgressContributor("Module X contribution");
MyWorker worker = prov.createWorker(contribs[i]);
//... snip ... do something with the worker..
i = i + 1;
}
AggregateProgressHandle handle = AggregateProgressFactory.createHandle("My Task", contribs, null, null);
// non-cancellable and with out output link.
// calling start() at the time when the actual long running task starts processing
handle.start("here we go");
// ...snip...
// now the individual MyWorker instances log their progress.
// possibly in other threads too..
// ... snip...
//
if (myConditionThatSpawnsAnotherContributor()) {
ProgressContributor cont = AggregateProgressFactory.createProgressContributor("Additional exceptional contribution");
handle.addContributor(cont);
// ... snip ...
}
// the task is finished when all the ProgressContributors finish..
</pre>
</usecase>
</answer>
<!--
<question id="arch-what" when="init">
What is this project good for?
<hint>
Please provide here a few lines describing the project,
what problem it should solve, provide links to documentation,
specifications, etc.
</hint>
</question>
-->
<answer id="arch-what">
<p>
The progress API is good for tracking progress of long lasting tasks in the IDE.
</p>
</answer>
<!--
<question id="compat-i18n" when="impl">
Is your module correctly internationalized?
<hint>
Correct internationalization means that it obeys instructions
at <a href="http://www.netbeans.org/download/dev/javadoc/org-openide-modules/org/openide/modules/doc-files/i18n-branding.html">
NetBeans I18N pages</a>.
</hint>
</question>
-->
<answer id="compat-i18n">
<p>
yes
</p>
</answer>
<!--
<question id="compat-standards" when="init">
Does the module implement or define any standards? Is the
implementation exact or does it deviate somehow?
</question>
-->
<answer id="compat-standards">
<p>
Not to my knowledge.
</p>
</answer>
<!--
<question id="compat-version" when="impl">
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?
<hint>
Very helpful for reading settings is to store version number
there, so future versions can decide whether how to read/convert
the settings and older versions can ignore the new ones.
</hint>
</question>
-->
<answer id="compat-version">
<p>
There are no settings currently. The API should be backward compatible.
</p>
</answer>
<!--
<question id="dep-jre" when="final">
Which version of JRE do you need (1.2, 1.3, 1.4, etc.)?
<hint>
It is expected that if your module runs on 1.x that it will run
on 1.x+1 if no, state that please. Also describe here cases where
you run different code on different versions of JRE and why.
</hint>
</question>
-->
<answer id="dep-jre">
<p>
1.4+
</p>
</answer>
<!--
<question id="dep-jrejdk" when="final">
Do you require the JDK or is the JRE enough?
</question>
-->
<answer id="dep-jrejdk">
<p>
JRE should be enough.
</p>
</answer>
<!--
<question id="dep-nb" when="init">
What other NetBeans projects and modules does this one depend on?
<hint>
If you want, describe such projects as imported APIs using
the <code><api name="identification" type="import or export" category="stable" url="where is the description" /></code>
</hint>
</question>
-->
<answer id="dep-nb">
<p>
Currently just openide, will also be dependent on module which will provide API for Status Line content.
(not in current codebase yet)
</p>
</answer>
<!--
<question id="dep-non-nb" when="init">
What other projects outside NetBeans does this one depend on?
<hint>
Some non-NetBeans projects are packaged as NetBeans modules
(see <a href="http://libs.netbeans.org/">libraries</a>) and
it is preferred to use this approach when more modules may
depend on such third-party library.
</hint>
</question>
-->
<answer id="dep-non-nb">
<p>
No external dependencies.
</p>
</answer>
<!--
<question id="dep-platform" when="init">
On which platforms does your module run? Does it run in the same
way on each?
<hint>
If your module is using JNI or deals with special differences of
OSes like filesystems, etc. please describe here what they are.
</hint>
</question>
-->
<answer id="dep-platform">
<p>
Should run everywhere the same. There might be different LookAndFeel for each platform.
</p>
</answer>
<answer id="deploy-dependencies">
<p>
Nothing.
</p>
</answer>
<!--
<question id="deploy-jar" when="impl">
Do you deploy just module JAR file(s) or other files as well?
<hint>
Usually a module consist of one JAR file (perhaps with Class-Path
extensions) and also a configuration file that enables it. If you
have any other files, use
<api group="java.io.File" name="yourname" type="export" category="friend">...</api>
to define the location, name and stability of your files (of course
changing "yourname" and "friend" to suit your needs).
If it uses more than one JAR, describe where they are located, how
they refer to each other.
If it consist of module JAR(s) and other files, please describe
what is their purpose, why other files are necessary. Please
make sure that installation/uninstallation leaves the system
in state as it was before installation.
</hint>
</question>
-->
<answer id="deploy-jar">
<p>
Just the module jar.
</p>
</answer>
<!--
<question id="deploy-nbm" when="impl">
Can you deploy an NBM via the Update Center?
<hint>
If not why?
</hint>
</question>
-->
<answer id="deploy-nbm">
<p>
Yes.
</p>
</answer>
<!--
<question id="deploy-packages" when="init">
Are packages of your module made inaccessible by not declaring them
public?
<hint>
NetBeans module system allows restriction of access rights to
public classes of your module from other modules. This prevents
unwanted dependencies of others on your code and should be used
whenever possible (<a href="http://www.netbeans.org/download/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.4-public-packages">
public packages
</a>). If you do not restrict access to your classes you are
making it too easy for other people to misuse your implementation
details, that is why you should have good reason for not
restricting package access.
</hint>
</question>
-->
<answer id="deploy-packages">
<p>
Yes.
</p>
</answer>
<!--
<question id="deploy-shared" when="final">
Do you need to be installed in the shared location only, or in the user directory only,
or can your module be installed anywhere?
<hint>
Installation location shall not matter, if it does explain why.
Consider also whether <code>InstalledFileLocator</code> can help.
</hint>
</question>
-->
<answer id="deploy-shared">
<p>
Anywhere.
</p>
</answer>
<!--
<question id="exec-ant-tasks" when="impl">
Do you define or register any ant tasks that other can use?
<hint>
If you provide an ant task that users can use, you need to be very
careful about its syntax and behaviour, as it most likely forms an
API for end users and as there is a lot of end users, their reaction
when such API gets broken can be pretty strong.
</hint>
</question>
-->
<answer id="exec-ant-tasks">
<p>
No.
</p>
</answer>
<!--
<question id="exec-classloader" when="impl">
Does your code create its own class loader(s)?
<hint>
A bit unusual. Please explain why and what for.
</hint>
</question>
-->
<answer id="exec-classloader">
<p>
No.
</p>
</answer>
<!--
<question id="exec-component" when="impl">
Is execution of your code influenced by any (string) property
of any of your components?
<hint>
Often <code>JComponent.getClientProperty</code>, <code>Action.getValue</code>
or <code>PropertyDescriptor.getValue</code>, etc. are used to influence
a behavior of some code. This of course forms an interface that should
be documented. Also if one depends on some interface that an object
implements (<code>component instanceof Runnable</code>) that forms an
API as well.
</hint>
</question>
-->
<answer id="exec-component">
<p>
The API is not. The implementation provided in the progress.ui module
allows the look and feel to set the color used to gray out the main window
during blocking progress operations, using <code>UIManager.getColor("progress.windowMaskColor")</code>.
</p>
</answer>
<!--
<question id="exec-introspection" when="impl">
Does your module use any kind of runtime type information (<code>instanceof</code>,
work with <code>java.lang.Class</code>, etc.)?
<hint>
Check for cases when you have an object of type A and you also
expect it to (possibly) be of type B and do some special action. That
should be documented. The same applies on operations in meta-level
(Class.isInstance(...), Class.isAssignableFrom(...), etc.).
</hint>
</question>
-->
<answer id="exec-introspection">
<p>
No.
</p>
</answer>
<!--
<question id="exec-privateaccess" when="final">
Are you aware of any other parts of the system calling some of
your methods by reflection?
<hint>
If so, describe the "contract" as an API. Likely private or friend one, but
still API and consider rewrite of it.
</hint>
</question>
-->
<answer id="exec-privateaccess">
<p>
No.
</p>
</answer>
<!--
<question id="exec-process" when="impl">
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?
<hint>
If you feed an input, parse the output please declare that as an API.
</hint>
</question>
-->
<answer id="exec-process">
<p>
No.
</p>
</answer>
<!--
<question id="exec-property" when="impl">
Is execution of your code influenced by any environment or
Java system (<code>System.getProperty</code>) property?
<hint>
If there is a property that can change the behavior of your
code, somebody will likely use it. You should describe what it does
and the <a href="http://openide.netbeans.org/tutorial/api-design.html#life">stability category</a>
of this API. You may use
<pre>
<api type="export" group="property" name="id" category="private" url="http://...">
description of the property, where it is used, what it influence, etc.
</api>
</pre>
</hint>
</question>
-->
<answer id="exec-property">
<p>
No.
</p>
</answer>
<!--
<question id="exec-reflection" when="impl">
Does your code use Java Reflection to execute other code?
<hint>
This usually indicates a missing or insufficient API in the other
part of the system. If the other side is not aware of your dependency
this contract can be easily broken.
</hint>
</question>
-->
<answer id="exec-reflection">
<p>
No.
</p>
</answer>
<!--
<question id="exec-threading" when="impl">
What threading models, if any, does your module adhere to?
<hint>
If your module calls foreign APIs which have a specific threading model,
indicate how you comply with the requirements for multithreaded access
(synchronization, mutexes, etc.) applicable to those APIs.
If your module defines any APIs, or has complex internal structures
that might be used from multiple threads, declare how you protect
data against concurrent access, race conditions, deadlocks, etc.,
and whether such rules are enforced by runtime warnings, errors, assertions, etc.
Examples: a class might be non-thread-safe (like Java Collections); might
be fully thread-safe (internal locking); might require access through a mutex
(and may or may not automatically acquire that mutex on behalf of a client method);
might be able to run only in the event queue; etc.
Also describe when any events are fired: synchronously, asynchronously, etc.
Ideas: <a href="http://core.netbeans.org/proposals/threading/index.html#recommendations">Threading Recommendations</a> (in progress)
</hint>
</question>
-->
<answer id="exec-threading">
<p>
The API can be called from any thread. However it is assumed that that the Progress indication starts, then progresses and then at last finishes.
</p>
</answer>
<!--
<question id="format-clipboard" when="impl">
Which data flavors (if any) does your code read from or insert to
the clipboard (by access to clipboard on means calling methods on <code>java.awt.datatransfer.Transferable</code>?
<hint>
Often Node's deal with clipboard by usage of <code>Node.clipboardCopy, Node.clipboardCut and Node.pasteTypes</code>.
Check your code for overriding these methods.
</hint>
</question>
-->
<answer id="format-clipboard">
<p>
Not applicable.
</p>
</answer>
<!--
<question id="format-dnd" when="impl">
Which protocols (if any) does your code understand during Drag & Drop?
<hint>
Often Node's deal with clipboard by usage of <code>Node.drag, Node.getDropType</code>.
Check your code for overriding these methods. Btw. if they are not overridden, they
by default delegate to <code>Node.clipboardCopy, Node.clipboardCut and Node.pasteTypes</code>.
</hint>
</question>
-->
<answer id="format-dnd">
<p>
No DND.
</p>
</answer>
<!--
<question id="format-types" when="impl">
Which protocols and file formats (if any) does your module read or write on disk,
or transmit or receive over the network? Do you generate an ant build script?
Can it be edited and modified?
<hint>
<p>
Files can be read and written by other programs, modules and users. If they influence
your behaviour, make sure you either document the format or claim that it is a private
api (using the <api> tag).
</p>
<p>
If you generate an ant build file, this is very likely going to be seen by end users and
they will be attempted to edit it. You should be ready for that and provide here a link
to documentation that you have for such purposes and also describe how you are going to
understand such files during next release, when you (very likely) slightly change the
format.
</p>
</hint>
</question>
-->
<answer id="format-types">
<p>
Nothing.
</p>
</answer>
<!--
<question id="lookup-lookup" when="init">
Does your module use <code>org.openide.util.Lookup</code>
or any similar technology to find any components to communicate with? Which ones?
<hint>
Please describe the interfaces you are searching for, where
are defined, whether you are searching for just one or more of them,
if the order is important, etc. Also classify the stability of such
API contract. For that use <api group=&lookup& /> tag.
</hint>
</question>
-->
<answer id="lookup-lookup">
<p>
yes, it finds the progress implementation that way..
</p>
</answer>
<!--
<question id="lookup-register" when="final">
Do you register anything into lookup for other code to find?
<hint>
Do you register using layer file or using <code>META-INF/services</code>?
Who is supposed to find your component?
</hint>
</question>
-->
<answer id="lookup-register">
<p>
it is be registered as part of the StatusLine.
</p>
</answer>
<!--
<question id="lookup-remove" when="final">
Do you remove entries of other modules from lookup?
<hint>
Why? Of course, that is possible, but it can be dangerous. Is the module
your are masking resource from aware of what you are doing?
</hint>
</question>
-->
<answer id="lookup-remove">
<p>
No.
</p>
</answer>
<!--
<question id="perf-exit" when="final">
Does your module run any code on exit?
</question>
-->
<answer id="perf-exit">
<p>
No.
</p>
</answer>
<!--
<question id="perf-huge_dialogs" when="final">
Does your module contain any dialogs or wizards with a large number of
GUI controls such as combo boxes, lists, trees, or text areas?
</question>
-->
<answer id="perf-huge_dialogs">
<p>
No.
</p>
</answer>
<!--
<question id="perf-limit" when="init">
Are there any hard-coded or practical limits in the number or size of
elements your code can handle?
</question>
-->
<answer id="perf-limit">
<p>
No.
</p>
</answer>
<!--
<question id="perf-mem" when="final">
How much memory does your component consume? Estimate
with a relation to the number of windows, etc.
</question>
-->
<answer id="perf-mem">
<p>
XXX no answer for perf-mem
</p>
</answer>
<!--
<question id="perf-menus" when="final">
Does your module use dynamically updated context menus, or
context-sensitive actions with complicated and slow enablement logic?
<hint>
If you do a lot of tricks when adding actions to regular or context menus, you can significantly
slow down display of the menu, even when the user is not using your action. Pay attention to
actions you add to the main menu bar, and to context menus of foreign nodes or components. If
the action is conditionally enabled, or changes its display dynamically, you need to check the
impact on performance. In some cases it may be more appropriate to make a simple action that is
always enabled but does more detailed checks in a dialog if it is actually run.
</hint>
</question>
-->
<answer id="perf-menus">
<p>
No.
</p>
</answer>
<!--
<question id="perf-progress" when="final">
Does your module execute any long-running tasks?
<hint>Long running tasks should never block
AWT thread as it badly hurts the UI
<a href="http://performance.netbeans.org/responsiveness/issues.html">
responsiveness</a>.
Tasks like connecting over
network, computing huge amount of data, compilation
be done asynchronously (for example
using <code>RequestProcessor</code>), definitively it should
not block AWT thread.
</hint>
</question>
-->
<answer id="perf-progress">
<p>
No.
</p>
</answer>
<!--
<question id="perf-scale" when="init">
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?
<hint>
Please include some estimates, there are other more detailed
questions to answer in later phases of implementation.
</hint>
</question>
-->
<answer id="perf-scale">
<p>
XXX no answer for perf-scale
</p>
</answer>
<!--
<question id="perf-spi" when="init">
How the performance of the plugged in code will be enforced?
<hint>
If you allow foreign code to be plugged into your own module, how
do you enforce that it will behave correctly and quickly and will not
negatively influence the performance of your own module?
</hint>
</question>
-->
<answer id="perf-spi">
<p>
Events for the visual component will be collected and related events will be merged upon display.
</p>
</answer>
<!--
<question id="perf-startup" when="final">
Does your module run any code on startup?
</question>
-->
<answer id="perf-startup">
<p>
No.
</p>
</answer>
<!--
<question id="perf-wakeup" when="final">
Does any piece of your code wake up periodically and do something
even when the system is otherwise idle (no user interaction)?
</question>
-->
<answer id="perf-wakeup">
<p>
No.
</p>
</answer>
<!--
<question id="resources-file" when="final">
Does your module use <code>java.io.File</code> directly?
<hint>
NetBeans provide a logical wrapper over plain files called
<code>org.openide.filesystems.FileObject</code> that
provides uniform access to such resources and is the preferred
way that should be used. But of course there can be situations when
this is not suitable.
</hint>
</question>
-->
<answer id="resources-file">
<p>
No.
</p>
</answer>
<!--
<question id="resources-layer" when="final">
Does your module provide own layer? Does it create any files or
folders in it? What it is trying to communicate by that and with which
components?
<hint>
NetBeans allows automatic and declarative installation of resources
by module layers. Module register files into appropriate places
and other components use that information to perform their task
(build menu, toolbar, window layout, list of templates, set of
options, etc.).
</hint>
</question>
-->
<answer id="resources-layer">
<p>
No.
</p>
</answer>
<!--
<question id="resources-mask" when="final">
Does your module mask/hide/override any resources provided by other modules in
their layers?
<hint>
If you mask a file provided by another module, you probably depend
on that and do not want the other module to (for example) change
the file's name. That module shall thus make that file available as an API
of some stability category.
</hint>
</question>
-->
<answer id="resources-mask">
<p>
No.
</p>
</answer>
<!--
<question id="resources-read" when="final">
Does your module read any resources from layers? For what purpose?
<hint>
As this is some kind of intermodule dependency, it is a kind of API.
Please describe it and classify according to
<a href="http://openide.netbeans.org/tutorial/api-design.html#categories">
common stability categories</a>.
</hint>
</question>
-->
<answer id="resources-read">
<p>
No.
</p>
</answer>
<!--
<question id="security-grant" when="final">
Does your code grant additional rights to some other code?
<hint>Avoid using a class loader that adds extra
permissions to loaded code unless really necessary.
Also note that your API implementation
can also expose unneeded permissions to enemy code by
calling AccessController.doPrivileged().</hint>
</question>
-->
<answer id="security-grant">
<p>
No.
</p>
</answer>
<!--
<question id="security-policy" when="final">
Does your functionality require modifications to the standard policy file?
<hint>Your code might pass control to third-party code not
coming from trusted domains. This could be code downloaded over the
network or code coming from libraries that are not bundled
with NetBeans. Which permissions need to be granted to which domains?</hint>
</question>
-->
<answer id="security-policy">
<p>
No.
</p>
</answer>
</api-answers>
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