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authorDave Orme2010-10-12 17:11:13 (EDT)
committerDave Orme2010-10-12 17:11:13 (EDT)
commitdd0a18c984863e9082fd6569a11c31f0544d996b (patch)
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parent27fe294219093c60986bc71d1036cd835646d7ce (diff)
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Point documentation.xml at the shiny new Wiki page. :)
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diff --git a/examples/org.eclipse.e4.ui.deeplink.example.client/documentation.xml b/examples/org.eclipse.e4.ui.deeplink.example.client/documentation.xml
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@@ -10,398 +10,6 @@
<chapter id="deeplink">
<title>Deeplinking - Making an RCP application URL-addressable</title>
- <para>Web and networked applications have shown the power and versatility of hyperlinking.
- Rich graphical applications have, generally speaking, missed out on the benefits of
- hyperlinking: being able to easily connect anything to anything else, across technologies
- and platforms.</para>
-
- <sect1>
- <title>Why deeplinking?</title>
-
- <para>Now that web browsers are increasingly being embedded into applications and
- hyperlinking is being implemented in desktop operating systems, we feel it would be
- beneficial if client-side applications could participate on an equal footing with
- web applications.</para>
-
- <para>Why?</para>
-
- <para>In order to understand the benefits that this could bring
- client-side applications, it is useful to first describe how URLs and hyperlinks
- are currently used in web applications:</para>
-
- <sect2>
- <title>URLs specify multiple entry points to applications</title>
-
- <para>Web applications commonly use URLs to specify multiple "starting places" within
- an application. For example, a content management system may expose separate URLs to
- enter the application at the system blog, the wiki, or within the calendaring system:</para>
-
- <para>In contrast, rich client applications have traditionally imposed a
- rigid navigational structure on the user, forcing him to start at the same
- entry screen and navigate everywhere else from there.</para>
- </sect2>
-
- <sect2>
- <title>URLs specify the initial information to load into a page</title>
-
- <para>URLs addressing pages within a web application may also include information
- about data to load. These "concatinated keys" of application + data identifier then may
- be emailed, sent via instant messaging clients, or embedded
- in applications and then used by <emphasis>other</emphasis>users to identify
- the same content on the same web site later. Common URLs of this sort include:</para>
-
- <itemizedlist>
- <listitem>
- <para>Google search URLs identifying particular searches/results</para>
- </listitem>
- <listitem>
- <para>URLs identifying SlideShare presentations or YouTube videos</para>
- </listitem>
- <listitem>
- <para>A specific LinkedIn user's home or profile page</para>
- </listitem>
- <listitem>
- <para>Etc...</para>
- </listitem>
- </itemizedlist>
-
- <para>Applied effectively, this capability provides constant-time navigation to common
- bits of data within an application.</para>
-
- <para>In contrast, rich client applications have traditionally imposed a rigid
- navigational structure on the user, forcing him to start at the same entry screen
- and navigate everywhere else from there.</para>
- </sect2>
-
- <sect2>
- <title>URLs help break applications into components</title>
-
- <para>While users can reference parts of an application by encoding input parameters
- into the URL, application programmers can then use this same capability to break
- applications into modules identified by these same entry points.</para>
-
- <para>In Web 1.0, or page-based applications, the entry points are specified by
- the set of pages and their URL parameters. This sort of application's API is then defined by
- the set of pages it has and the parameters these pages can accept.</para>
-
- <para>In AJAX applications, these modules and entry points
- can be made even richer because the result of a request no longer is an HTML page,
- but rather is an XML or JSON document. This result document contains the data that is then rendered
- into the web client's page via JavaScript and CSS.</para>
-
- <para>The API of this kind of application then
- becomes the set of XML or JSON results that can be retrieved by sending
- requests with parameters encoded in the query string. This kind of API
- then basically becomes a generic remote procedure call with HTTP as the
- transport, the set of procedures defined by the kinds of URLs that may be written,
- and XML or JSON as the result type.</para>
-
- <para>In contrast, rich client applications tend to have application code that is
- tightly and rigidly coupled to the navigational structure of the underlying data.</para>
- </sect2>
-
- <sect2>
- <title>Allowing cross-platform, open access to information</title>
-
- <para>Whenever the Google spider indexes a web site, the web application on that
- site is being used by a heterogeneous tool set.</para>
-
- <para>Less grandly, web sites can be scraped and controlled by Microsoft Office
- applications, by scripting languages, and by programming environments different
- from the ones originally used to create them.</para>
-
- <para>In each case, the end result is that making data URL-addressable enables
- applications that the originators never conceived or imagined.</para>
- </sect2>
-
- <sect2>
- <title>Deeplinking: a technology-neutral, URL-based integration platform</title>
-
- <para>We have observed many benefits that URL addressing brings to web
- applications</para>
-
- <itemizedlist>
- <listitem>
- <para>Having multiple "start pages" and relaxing the navigation structure
- within your application</para>
- </listitem>
- <listitem>
- <para>Identifying bits of information, such as a video, slide show, or search
- result using a form that is easy to store and share</para>
- </listitem>
- <listitem>
- <para>Enabling applications to be broken into components. These components
- may be defined by user interface pages (ie: a YouTube video) or may perform
- an action and retrieve a result (ie: a RESTful AJAX invocation).</para>
- </listitem>
- <listitem>
- <para>Allowing and encouraging open, cross-platform use of data, enabling
- uses that the original application authors never imagined.</para>
- </listitem>
- </itemizedlist>
-
- <para>We believe that it is time to make these benefits available to rich graphical
- client applications as well. Deeplinking implements a solid first step toward enabling this
- goal.</para>
- </sect2>
- </sect1>
-
- <sect1>
- <title>How does deeplinking work?</title>
-
- <para>Deeplinking provides a specification and a Java/Eclipse RCP-based
- reference implementation for how any rich graphical application can be made deeply
- URL-addressable, and thus begin to participate and inter-operate in a networked,
- hyperlinked world. Deeplinks work regardless of if the application is started; if it is
- not already started, the deeplink URL handler will automatically launch it.</para>
-
- <para>The best way to understand deeplinking is by describing how it works. Deeplink
- URLs are of the following form:</para>
-
- <programlisting>deeplink://appName/handlerType/handlerInstanceId/action?param1=value1&amp;param2=value2...</programlisting>
-
- <para>where the action and parameters are optional. The appName is the name of the subdirectory
- where the application lives. The remaining two segments are the handler type and the instance ID.
- The handler type is the "type" of the "object" that the link addresses. The handlerInstanceId is
- the string ID the application needs in order to look up an object of the specified type.</para>
-
- <note>
- <title>Unix directory structures</title>
-
- <para>On Unix, it is recommended to place the applications files in an appropriate
- application-specific directory and install a symbolic link to the application's
- binary executable in the appropriate /bin folder, usually /usr/bin or /usr/local/bin.</para>
- </note>
-
- <para>For example, an Eclipse RCP application could have a following deeplink:</para>
-
- <programlisting>deeplink://rcp-app/perspective/org.eclipse.rcp-app.client.perspective?customerid=some_customer_id</programlisting>
-
- <para>The elements of this deeplink have the following meanings:</para>
-
- <itemizedlist>
- <listitem>
- <para><computeroutput>rcp-app</computeroutput> : The name of the subdirectory that the application lives in</para>
- </listitem>
- <listitem>
- <para><computeroutput>perspective</computeroutput> : This deeplink opens or displays a perspective</para>
- </listitem>
- <listitem>
- <para><computeroutput>org.eclipse.rcp-app.client.perspective</computeroutput> : The Eclipse RCP perspective ID</para>
- </listitem>
- <listitem>
- <para><computeroutput>?customerid=some_customer_id</computeroutput> : defines, in the same way as a web application, parameters
- to pass to the Perspective Factory and thus into the application.
-
- Specifically, the <computeroutput>IPerspectiveFactory </computeroutput> referenced by the perspective ID must extend the
- <computeroutput>AbstractDeepLinkInstanceHandler</computeroutput> interface.
-
- In our example, the perspective might then instruct
- views or editors to load a particular trade or set the workbench selection to that trade.</para>
- </listitem>
- </itemizedlist>
-
- <para>Deeplinking is designed so that any application that can listen to a network socket using the HTTP
- protocol can participate. And the URL format is designed so that handler types can be created for
- any kind of application: Eclipse RCP, Swing, .NET, etc. The one current restriction is that deeplinks
- are a 100% local protocol. I.e: a deeplink:// URL always refers to an application running
- on "localhost" and the deeplink URL handler resolves the port number assignment based on the
- application name.</para>
-
- </sect1>
-
- <sect1 id="using-deep-linking">
- <title>Using Deeplinking</title>
-
- <para>The Eclipse deeplinking system has two parts:</para>
-
- <itemizedlist>
- <listitem>
- <para>The deeplink launch proxy. This is a regular POJO command-line application that
- Windows calls via the Windows Registry URL handler mechanism. This is needed to receive and translate
- deeplinks into standard HTTP and forward to the RCP container.</para>
- </listitem>
- <listitem>
- <para>A library that you can include in your RCP application that uses the built-in Eclipse
- RCP servlet container to handle various types of RCP;-based deeplink URLs.
- Additionally, applications that use this library can process HTTP responses received from
- other deeplink aware applications.</para>
- </listitem>
- </itemizedlist>
-
- <sect2>
- <title>Building and configuring the deeplink launch proxy</title>
-
- <para>You can use a pre-built launch proxy or you can build your own.</para>
-
- <para>The launch proxy is 100% self-contained inside its own directory
- structure, so installing and uninstalling it is simply a matter of copying it to the
- location of your choice. You can then register it with Windows so that it will
- automatically handle deeplink URLs that Windows encounters in desktop shortcuts or in
- web pages.</para>
-
- <para>To register your launch proxy with Windows, you will need to add some keys to
- the Windows registry. A pre-built Windows registry configuration file is shipped
- with the launch proxy. You can edit this configuration file and load its keys as
- follows:</para>
-
- <itemizedlist>
- <listitem>
- <para>Locate the <computeroutput>*.reg</computeroutput> file
- that was shipped with launch proxy. You will find it in the root folder of
- the launch proxy distribution.</para>
- </listitem>
- <listitem>
- <para>Right-click this file, and choose <computeroutput>Edit</computeroutput>
- from the context menu. You will need to use a text editor that knows how
- to deal with multibyte character sets. On Windows, Notepad++ is a F/OSS
- editor that works well.</para>
- </listitem>
- <listitem>
- <para>Change the last line of the file to contain the full path and file name
- of the <computeroutput>deeplink-launch.exe</computeroutput> file. You may
- optionally specify an executable file containing an icon for deeplinks.</para>
- </listitem>
- <listitem>
- <para>Save and exit the editor.</para>
- </listitem>
- <listitem>
- <para>Double-click the .reg file to load it into Windows.</para>
- </listitem>
- </itemizedlist>
-
- <para>You have now installed the deeplink launch proxy and have configured Windows to
- understand the <computeroutput>deeplink://</computeroutput> URL type.</para>
- </sect2>
- </sect1>
-
- <sect1>
- <title>Using Deeplinking</title>
-
- <para>For working examples, it is recommended to read the source code of the
- examples shipped with deeplinking as these will always contain the latest
- recommended usage patterns.</para>
-
- <para>As described before, a generic deeplink URL is in the following form:</para>
-
- <programlisting>deeplink://appName/handlerType/handlerInstanceId/action?param1=value1&amp;param2=value2...</programlisting>
-
- <para>In order to use deeplinking, one may perform one of two tasks:</para>
-
- <itemizedlist>
- <listitem>
- <para>Define deeplinks in one's application</para>
- </listitem>
- <listitem>
- <para>Extend deeplinking to support additional handlerTypes</para>
- </listitem>
- </itemizedlist>
-
- <para>This document will cover the former.</para>
-
- <para>Out of the box, deeplinking supports two handlerTypes:</para>
-
- <itemizedlist>
- <listitem>
- <para><computeroutput>perspective</computeroutput> : Open a perspective and optionally
- execute a callback that may return data to the caller.</para>
- </listitem>
- <listitem>
- <para><computeroutput>extensionpt</computeroutput> : Run a callback that is defined by
- an Eclipse extension point. This callback also may optionally return data to the
- caller.</para>
- </listitem>
- </itemizedlist>
-
- <para>The good news is that out of the box, all Eclipse perspectives are automatically turned
- into deeplinks of the form:</para>
-
- <programlisting>deeplink://appName/perspective/com.your-company.your-app.perspective.id</programlisting>
-
- <para>You do not need to do <emphasis>any</emphasis> work beyond enabling deeplinking to use these.</para>
-
- <para>However, if you want your perspectives to process URL parameters or to return results,
- or if you want to define a "headless" callback that can perform any arbitrary (UI or non-UI)
- processing, you will need to do a small amount of additional work:</para>
-
- <sect2>
- <title>Defining a post-perspective-switch callback</title>
-
- <para>In order to define a callback on a perspective, you only need to make your
- perspective factory class extend the callback's abstract class and implement the callback
- method.</para>
-
- <programlisting>public class Perspective extends AbstractDeepLinkInstanceHandler implements IPerspectiveFactory {
- public void createInitialLayout(IPageLayout layout) {
- // your perspective initialization...
- }
-
- @Override
- public Map&lt;String, String> activate(String handlerInstanceID,
- String action, Map&lt;String, String[]> params) {
- // Do whatever you want here. We'll return a simple Date value as an example...
- HashMap&lt;String, String> result = new HashMap&lt;String, String>();
- result.put("date", new Date().toString());
- return result;
- }
-}</programlisting>
-
- <para>That's it. You don't need to register your perspective callback
- because it's <emphasis>already</emphasis> registered by its perspective ID. Deeplinking
- will automatically look it up and call the callback if it exists.</para>
- </sect2>
-
- <sect2>
- <title>Defining a "headless" extension point callback</title>
-
- <para>An extension point callback is defined nearly the same way as a perspective
- callback. The code looks like the following:</para>
-
- <programlisting>public class SayHelloHandler extends AbstractDeepLinkInstanceHandler {
- @Override
- public Map&lt;String, String> activate(String handlerInstanceID, String action,
- Map&lt;String, String[]> params) {
- Map&lt;String, String> results = new HashMap&lt;String, String>();
- String helloMessage = "Hello, " + action;
- System.out.println(helloMessage);
- results.put("Hello", helloMessage);
- return results;
- }
-}</programlisting>
-
- <para>Once you have the code, you have to register the callback using an extension
- point:</para>
-
- <itemizedlist>
- <listitem>
- <para>Go to the MANIFEST.MF editor for your bundle and switch to the "extensions"
- tab.</para>
- </listitem>
- <listitem>
- <para>Click "Add..." and add a new
- <computeroutput>org.eclipse.e4.core.deeplink.typehandler.extensionpt.deepLinkExtensionPointInstanceHandler</computeroutput>
- extension point.</para>
- </listitem>
- <listitem>
- <para>Click on the child in the tree</para>
- </listitem>
- <listitem>
- <para>Change the "id" field to the URL fragment that will identify the deeplink. For example,
- our "Hello, world" extension point uses "sayhello" as its id.</para>
- </listitem>
- <listitem>
- <para>Click "Browse..." and choose the class you created previously as your callback.</para>
- </listitem>
- </itemizedlist>
-
- <para>Once this is done, your callback may be accessed using a URL of the form:</para>
-
- <programlisting>deeplink://appName/extensionpt/id/optionalAction?param1=value1...</programlisting>
-
- <para>Or to use the deep link defined by the code example above:</para>
-
- <programlisting>deeplink://appName/extensionpt/sayhello/George</programlisting>
- </sect2>
- </sect1>
-
+ <para>This documentation has moved to:
+ <ulink url="http://wiki.eclipse.org/E4/Deeplinking">the Eclipse Wiki</ulink></para>
</chapter>