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| <a class="nav-link" href="../../tutorials-examples-and-presentations/apache-felix-osgi-tutorial/apache-felix-tutorial-example-8.html">Example 8 - Spell Checker Service using Service Binder</a> |
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| <a class="nav-link" href="../../tutorials-examples-and-presentations/apache-felix-osgi-tutorial/apache-felix-tutorial-example-9.html">Example 9 - Spell Checker Service using Declarative Services</a> |
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| <div class="content"> |
| <article class="doc"> |
| <h1 class="page">RFC 147 Overview</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The RFC-147 draft is not yet publicly available. |
| It used to be called RFC-132, which can be found in an <a href="http://www.osgi.org/download/osgi-4.2-early-draft.pdf">early specification draft</a></p> |
| </div> |
| <div class="paragraph"> |
| <p>This is an overview of its main features:</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_standard_way_to_implement_and_run_commands_for_any_osgi_4_2_framework"><a class="anchor" href="#_standard_way_to_implement_and_run_commands_for_any_osgi_4_2_framework"></a>Standard way to implement and run commands for any OSGi 4.2 framework</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Commands are registered via service attributes, you don’t have to register a specific service. |
| This allows commands to be registered by existing services, just by adding the new attributes:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> Dictionary<String, Object> dict = new Hashtable<String, Object>(); |
| dict.put(CommandProcessor.COMMAND_SCOPE, "shell"); |
| dict.put(CommandProcessor.COMMAND_FUNCTION, new String[] {"sleep", "grep"}); |
| context.registerService(name, service, dict);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Scope is used to provide a namespace for commands. |
| The commands above can be invoked as <code>shell:sleep</code> and <code>shell:grep</code>. |
| If the scope is omitted (e.g. |
| <code>sleep</code> and <code>grep</code>) then the first matching command is invoked.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_commands_can_have_any_signature"><a class="anchor" href="#_commands_can_have_any_signature"></a>Commands can have any signature</h3> |
| <div class="paragraph"> |
| <p>Arguments are coerced to call the best matching method using reflection. |
| A <code>CommandSession</code> argument is inserted if required:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public void sleep(long millis) throws InterruptedException{ |
| Thread.sleep(millis); |
| } |
| |
| public void sleep(String[] args) throws Exception; |
| |
| public boolean grep(CommandSession session, String[] args) throws Exception;</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>CommandSession</code> interface provides methods for executing commands and getting and setting session variables:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> public interface org.apache.felix.service.command.CommandSession { |
| Object execute(CharSequence commandline) throws Exception; |
| Object get(String name); |
| void put(String name, Object value); |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_easy_to_use_interactively_no_unnecessary_syntax"><a class="anchor" href="#_easy_to_use_interactively_no_unnecessary_syntax"></a>Easy to use interactively - no unnecessary syntax</h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>basic commands</p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! echo hello world |
| hello world</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>session variables</p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! msg = "hello world" |
| g! echo $msg |
| hello world</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>execution quotes <code>()</code> - similar to bash backquotes</p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! (bundle 1) location |
| file:/Users/derek/Downloads/felix-framework-3.0.0/bundle/org.apache.felix.bundlerepository-1.6.2.jar</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_lists_maps_pipes_and_closures"><a class="anchor" href="#_lists_maps_pipes_and_closures"></a>Lists, maps, pipes and closures</h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>lists - <code>[]</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! list = [1 2 a b] |
| 1 |
| 2 |
| a |
| b</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>maps - <code>[]</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! map = [Jan=1 Feb=2 Mar=3] |
| Jan 1 |
| Feb 2 |
| Mar 3</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>pipes - <code>|</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! bundles | grep gogo |
| 2|Active | 1|org.apache.felix.gogo.command (0.6.0) |
| 3|Active | 1|org.apache.felix.gogo.runtime (0.6.0) |
| 4|Active | 1|org.apache.felix.gogo.shell (0.6.0)</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>closures - <code>{}</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! echo2 = { echo xxx $args yyy } |
| g! echo2 hello world |
| xxx hello world yyy</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_leverages_existing_java_capabilities_via_reflection"><a class="anchor" href="#_leverages_existing_java_capabilities_via_reflection"></a>Leverages existing Java capabilities, via reflection</h3> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>exception handling - console shows summary, but full context available</p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! start xxx |
| E: Cannot coerce start[xxx] to any of [(Bundle)] |
| g! $exception printstacktrace |
| java.lang.IllegalArgumentException: Cannot coerce start[xxx] to any of [(Bundle)] |
| at org.apache.felix.gogo.runtime.shell.Reflective.method(Reflective.java:162) |
| at org.apache.felix.gogo.runtime.shell.Command.execute(Command.java:40) |
| at org.apache.felix.gogo.runtime.shell.Closure.execute(Closure.java:211) |
| at org.apache.felix.gogo.runtime.shell.Closure.executeStatement(Closure.java:146) |
| at org.apache.felix.gogo.runtime.shell.Pipe.run(Pipe.java:91) |
| ...</code></pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>add all public methods on <code>java.lang.System</code> as commands:</p> |
| </li> |
| </ul> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! addcommand system (loadClass java.lang.System) |
| g! system:getproperties |
| sun.io.unicode.encodingUnicodeLittle |
| java.version 1.5.0_19 |
| java.class.path bin/felix.jar |
| java.awt.graphicsenvapple.awt.CGraphicsEnvironment |
| user.language en |
| sun.os.patch.level unknown |
| os.version 10.6.2 |
| [snip]</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_easy_to_implement_and_test_commands_without_needing_osgi"><a class="anchor" href="#_easy_to_implement_and_test_commands_without_needing_osgi"></a>Easy to implement and test commands without needing OSGi</h3> |
| <div class="paragraph"> |
| <p>Command implementations don’t need to reference any OSGi interfaces. |
| They can use <code>System.in</code>, <code>System.out</code> and <code>System.err</code>, just as you would in a trivial Java application. |
| The <code>ThreadIO</code> service transparently manages the singleton <code>System.out</code> etc, so that each thread sees the appropriate stream:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> public void cat(String[] args) throws Exception { |
| for (String arg : args) { |
| IOUtil.copy(arg, System.out); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_normal_commands_can_provide_control_primitives"><a class="anchor" href="#_normal_commands_can_provide_control_primitives"></a>Normal commands can provide control primitives</h3> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> public void each(CommandSession session, Collection<Object> list, Function closure) throws Exception { |
| for (Object x : list) { |
| closure.execute(session, null); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>then</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-sh hljs" data-lang="sh"> g! each [Jan Feb Mar] { echo $it | grep . } |
| Jan |
| Feb |
| Mar</code></pre> |
| </div> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| The default <em>echo</em> command <em>returns</em> a String and does not write to System.out. |
| Also, by default, the console prints the results of each command, so <em>echo</em> appears to behave as you would expect. |
| However, the console does not see the <em>each</em> closure above, so the result of echo would not be seen. |
| This is why it is piped into <em>grep</em>, as the <em>result</em> of the command as well as its output is written to a pipeline. |
| </td> |
| </tr> |
| </table> |
| </div> |
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