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| |
| <h1><a name="iPOJO-Arch-Command-iPOJO{{Arch}}command"></a>iPOJO <tt>Arch</tt> command</h1> |
| <p><em>Architecture introspection is required when the system doesn't |
| work as expected. In this case, having a quick access to instances |
| states and interconnection is a stringent requirement. The <tt>arch</tt> command allows getting these data from the Felix Shell and from the Equinox shell.</em></p> |
| |
| <div class="toc"> |
| <ul> |
| <li><a href="#iPOJO-Arch-Command-Download">Download</a></li> |
| <li><a href="#iPOJO-Arch-Command-Usage">Usage</a></li> |
| <li><a href="#iPOJO-Arch-Command-Readinginstancearchitecture">Reading instance architecture</a></li> |
| <li><a href="#iPOJO-Arch-Command-Listavailablefactories">List available factories</a></li> |
| <li><a href="#iPOJO-Arch-Command-Listavailablehandlers">List available handlers</a></li> |
| </ul></div> |
| |
| <h2><a name="iPOJO-Arch-Command-Download"></a>Download</h2> |
| <p>The Felix command is available from the <a href="http://felix.apache.org/site/download.html" title="Download">Download</a> page and in the <tt>arch</tt> folder of the iPOJO trunk <a href="http://svn.apache.org/viewvc/felix/trunk/ipojo/arch" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/arch/</a>.<br> |
| The Equinox command sources are available <a href="http://svn.apache.org/viewvc/felix/sandbox/clement/ipojo-utils/arch-equinox/" rel="nofollow">http://svn.apache.org/repos/asf/felix/sandbox/clement/ipojo-utils/arch-equinox/</a>. To compile sources, just launch the <tt>mvn clean install</tt>.</p> |
| |
| <h2><a name="iPOJO-Arch-Command-Usage"></a>Usage</h2> |
| <p>Once you get the bundle, just install and start it in the OSGi Framework shell:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>start file:/BUNDLE_URL.jar </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">start file:/BUNDLE_URL.jar</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
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| </script> |
| </div> |
| |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>install file:/BUNDLE_URL.jar </span></td></tr><tr><td class="line2">Bundle X installed </td></tr><tr><td class="line1">start X </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">install file:/BUNDLE_URL.jar |
| Bundle X installed |
| start X</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
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| |
| </script> |
| </div> |
| |
| <p>Then, you can use it to introspect the system by launching the <tt>arch</tt> command.</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>arch => displays instances name & state (equivalent to arch \-instances) </span></td></tr><tr><td class="line2">arch -instance $instance_name => displays complete information about the instance $instance_name </td></tr><tr><td class="line1">arch -factories => display the <span class="keyword">list</span><span> of available factories </span></td></tr><tr><td class="line2">arch -factory $factory_name => display complete information about the factory $factory_name </td></tr><tr><td class="line1">arch -handlers => <span class="keyword">list</span><span> available handlers </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">arch => displays instances name & state (equivalent to arch \-instances) |
| arch -instance $instance_name => displays complete information about the instance $instance_name |
| arch -factories => display the list of available factories |
| arch -factory $factory_name => display complete information about the factory $factory_name |
| arch -handlers => list available handlers</textarea> |
| <script class="javascript"> |
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| </script> |
| </div> |
| |
| <h2><a name="iPOJO-Arch-Command-Readinginstancearchitecture"></a>Reading instance architecture </h2> |
| <p>When you launch the <tt>arch</tt> command, the list of created instances (enabling architecture introspection) is displayed.</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>-> arch </span></td></tr><tr><td class="line2">Instance ArchCommand -> valid </td></tr><tr><td class="line1">Instance spell.english.EnglishDictionary-0 -> valid </td></tr><tr><td class="line2">Instance spell.checker.SpellCheck-0 -> valid </td></tr><tr><td class="line1">Instance spell.gui.SpellCheckerGui-0 -> valid </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">-> arch |
| Instance ArchCommand -> valid |
| Instance spell.english.EnglishDictionary-0 -> valid |
| Instance spell.checker.SpellCheck-0 -> valid |
| Instance spell.gui.SpellCheckerGui-0 -> valid</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>To get more information on an instance, launch <tt>arch -instance the_instance_name</tt></p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>-> arch -instance spell.checker.SpellCheck-0 </span></td></tr><tr><td class="line2">instance component.<span class="keyword">type</span><span>="spell.checker.SpellCheck" state="valid" bundle="8" name="spell.checker.SpellCheck-0" </span></td></tr><tr><td class="line1"> handler state="valid" name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" </td></tr><tr><td class="line2"> requires optional="<span class="keyword">false</span><span>" aggregate="</span><span class="keyword">false</span><span>" state="resolved" binding-policy="dynamic" specification="spell.services.DictionaryService" </span></td></tr><tr><td class="line1"> handler state="valid" name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" </td></tr><tr><td class="line2"> provides service.id="36" state="registered" specifications="[spell.services.SpellChecker]" </td></tr><tr><td class="line1"> property value="spell.checker.SpellCheck" name="factory.name" </td></tr><tr><td class="line2"> property value="spell.checker.SpellCheck-0" name="instance.name" </td></tr><tr><td class="line1"> handler state="valid" name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler" </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">-> |
| arch -instance spell.checker.SpellCheck-0 instance |
| component.type="spell.checker.SpellCheck" state="valid" bundle="8" |
| name="spell.checker.SpellCheck-0" handler state="valid" |
| name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" |
| requires optional="false" aggregate="false" state="resolved" |
| binding-policy="dynamic" |
| specification="spell.services.DictionaryService" handler state="valid" |
| name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" |
| |
| provides service.id="36" state="registered" |
| specifications="[spell.services.SpellChecker]" property |
| value="spell.checker.SpellCheck" name="factory.name" property |
| value="spell.checker.SpellCheck-0" name="instance.name" handler |
| state="valid" |
| name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler"</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>Instance architecture is organized as follows:<br> |
| On the first line, are displayed the component type (i.e. factory), the instance state (<tt>valid</tt> or <tt>invalid</tt>), the bundle from which the instance is created, and the instance name.<br> |
| Then, the information is organized handler by handler (a piece of |
| container). For each handler plugged on the instance can participate to |
| the instance architecture. For each handler its name (such as {{ |
| org.apache.felix.ipojo.handlers.dependency.DependencyHandler}} for |
| iPOJO service dependencies, {{ |
| org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler}} |
| for iPOJO service providing...) and the state (either <tt>valid</tt> or <tt>invalid</tt> are displayed. Remember that an instance is valid only and only if all plugged handlers are valid. <br> |
| The <tt>org.apache.felix.ipojo.handlers.dependency.DependencyHandler</tt> |
| provides data on service dependencies and more precisely on the state |
| of service dependencies. In the previous example, the dependency on {{ |
| spell.services.DictionaryService}} was resolved. On the following |
| example, the same dependency is no more resolved:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>instance component.</span><span class="keyword">type</span><span>="spell.checker.SpellCheck" state="invalid" bundle="8" name="spell.checker.SpellCheck-0" </span></td></tr><tr><td class="line2"> handler state="invalid" name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" </td></tr><tr><td class="line1"> requires optional="<span class="keyword">false</span><span>" aggregate="</span><span class="keyword">false</span><span>" state="unresolved" binding-policy="dynamic" specification="spell.services.DictionaryService" </span></td></tr><tr><td class="line2"> handler state="valid" name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" </td></tr><tr><td class="line1"> provides state="unregistered" specifications="[spell.services.SpellChecker]" </td></tr><tr><td class="line2"> property value="spell.checker.SpellCheck" name="factory.name" </td></tr><tr><td class="line1"> property value="spell.checker.SpellCheck-0" name="instance.name" </td></tr><tr><td class="line2"> handler state="valid" name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler" </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">instance |
| component.type="spell.checker.SpellCheck" state="invalid" bundle="8" |
| name="spell.checker.SpellCheck-0" handler state="invalid" |
| name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" |
| requires optional="false" aggregate="false" state="unresolved" |
| binding-policy="dynamic" |
| specification="spell.services.DictionaryService" handler state="valid" |
| name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" |
| |
| provides state="unregistered" |
| specifications="[spell.services.SpellChecker]" property |
| value="spell.checker.SpellCheck" name="factory.name" property |
| value="spell.checker.SpellCheck-0" name="instance.name" handler |
| state="valid" |
| name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler"</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>Notes that, the instance also becomes invalid and that the provided service is unregistered.<br> |
| If the provider comes back, the dependency becomes <tt>resolved</tt> and the instance becomes <tt>valid</tt><br> |
| If an instance begins to use a service, the bound providers are described in the instance architecture:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>-> arch -instance spell.checker.SpellCheck-0 </span></td></tr><tr><td class="line2">instance component.<span class="keyword">type</span><span>="spell.checker.SpellCheck" state="valid" bundle="8" name="spell.checker.SpellCheck-0" </span></td></tr><tr><td class="line1"> object name="spell.checker.SpellCheck@e222eb" </td></tr><tr><td class="line2"> handler state="valid" name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" </td></tr><tr><td class="line1"> requires optional="<span class="keyword">false</span><span>" aggregate="</span><span class="keyword">false</span><span>" state="resolved" binding-policy="dynamic" specification="spell.services.DictionaryService" </span></td></tr><tr><td class="line2"> uses service.id="41" instance.name="spell.english.EnglishDictionary-0" </td></tr><tr><td class="line1"> handler state="valid" name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" </td></tr><tr><td class="line2"> provides service.id="42" state="registered" specifications="[spell.services.SpellChecker]" </td></tr><tr><td class="line1"> property value="spell.checker.SpellCheck" name="factory.name" </td></tr><tr><td class="line2"> property value="spell.checker.SpellCheck-0" name="instance.name" </td></tr><tr><td class="line1"> handler state="valid" name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler" </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">-> |
| arch -instance spell.checker.SpellCheck-0 instance |
| component.type="spell.checker.SpellCheck" state="valid" bundle="8" |
| name="spell.checker.SpellCheck-0" object |
| name="spell.checker.SpellCheck@e222eb" handler state="valid" |
| name="org.apache.felix.ipojo.handlers.dependency.DependencyHandler" |
| requires optional="false" aggregate="false" state="resolved" |
| binding-policy="dynamic" |
| specification="spell.services.DictionaryService" uses service.id="41" |
| instance.name="spell.english.EnglishDictionary-0" handler state="valid" |
| name="org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler" |
| |
| provides service.id="42" state="registered" |
| specifications="[spell.services.SpellChecker]" property |
| value="spell.checker.SpellCheck" name="factory.name" property |
| value="spell.checker.SpellCheck-0" name="instance.name" handler |
| state="valid" |
| name="org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler"</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>In the previous case, the dependency on {{ |
| spell.services.DictionaryService}} use the service 41 from the iPOJO |
| instance named {{ spell.english.EnglishDictionary-0}}<br> |
| You can also check created POJO objects (implementation class objet). Here, only one object was created (<tt>spell.checker.SpellCheck@e222eb</tt>).</p> |
| <h2><a name="iPOJO-Arch-Command-Listavailablefactories"></a>List available factories</h2> |
| <p>To list available factories (i.e. component types), launch the <tt>arch -factories</tt> command:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>-> arch -factories </span></td></tr><tr><td class="line2">Factory spell.checker.SpellCheck (VALID) </td></tr><tr><td class="line1">Factory spell.gui.SpellCheckerGui (VALID) </td></tr><tr><td class="line2">Factory spell.english.EnglishDictionary (VALID) </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">-> arch -factories |
| Factory spell.checker.SpellCheck (VALID) |
| Factory spell.gui.SpellCheckerGui (VALID) |
| Factory spell.english.EnglishDictionary (VALID)</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>For each available (public) factories,the name and the sate are |
| displayed. A factory is valid if and only if all required handlers are |
| available. To get more information on a factory launch the <tt>arch -factory factory_name</tt> command:</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>factory implementation-class="spell.english.EnglishDictionary" state="valid" bundle="7" name="spell.english.EnglishDictionary" </span></td></tr><tr><td class="line2"> provides specification="spell.services.DictionaryService" </td></tr><tr><td class="line1"> missinghandlers <span class="keyword">list</span><span>="[]" </span></td></tr><tr><td class="line2"> requiredhandlers <span class="keyword">list</span><span>="[org.apache.felix.ipojo:provides, org.apache.felix.ipojo:architecture]" </span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">factory implementation-class="spell.english.EnglishDictionary" state="valid" bundle="7" name="spell.english.EnglishDictionary" |
| provides specification="spell.services.DictionaryService" |
| missinghandlers list="[]" |
| requiredhandlers list="[org.apache.felix.ipojo:provides, org.apache.felix.ipojo:architecture]"</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>On the first line, you get the implementation class of the type, the |
| state of the factory, the bundle declaring the type and the name of the |
| type. Then you get the list of required and missing handlers.</p> |
| <h2><a name="iPOJO-Arch-Command-Listavailablehandlers"></a>List available handlers</h2> |
| <p>You can also list available handlers with the <tt>arch -handlers</tt> command.</p> |
| <div class="code"> |
| <div class="dp-highlighter"><table class="dp-shell" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span>-> arch -handlers </span></td></tr><tr><td class="line2">Handler org.apache.felix.ipojo:controller (VALID) </td></tr><tr><td class="line1">Handler org.apache.felix.ipojo:callback (VALID) </td></tr><tr><td class="line2">Handler org.apache.felix.ipojo:requires (VALID) </td></tr><tr><td class="line1">Handler org.apache.felix.ipojo:provides (VALID) </td></tr><tr><td class="line2">Handler org.apache.felix.ipojo:properties (VALID) </td></tr><tr><td class="line1">Handler org.apache.felix.ipojo:architecture (VALID) </td></tr><tr><td class="line2">Handler org.apache.felix.ipojo.handler.whiteboard:wbp (VALID) </td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="shell:nocontrols:nogutter" rows="10" readonly="readonly">-> arch -handlers |
| Handler org.apache.felix.ipojo:controller (VALID) |
| Handler org.apache.felix.ipojo:callback (VALID) |
| Handler org.apache.felix.ipojo:requires (VALID) |
| Handler org.apache.felix.ipojo:provides (VALID) |
| Handler org.apache.felix.ipojo:properties (VALID) |
| Handler org.apache.felix.ipojo:architecture (VALID) |
| Handler org.apache.felix.ipojo.handler.whiteboard:wbp (VALID)</textarea> |
| <script class="javascript"> |
| if(!window.newcodemacro_initialised) |
| { |
| window.newcodemacro_initialised = true; |
| window.oldonloadmethod = window.onload; |
| window.onload = function(){ |
| dp.SyntaxHighlighter.HighlightAll('newcodemacro'); |
| if(window.oldonloadmethod) |
| { |
| window.oldonloadmethod(); |
| } |
| } |
| } |
| |
| </script> |
| </div> |
| |
| <p>Handlers with the <tt>org.apache.felix.ipojo</tt> namespace (section before <tt>:</tt>) are core handlers (provided by the iPOJO bundle). Others are external handlers (provided by others bundles). |
| <br clear="all"> |
| <br clear="all"></p> |
| |
| </div> |
| <img src="ipojo-arch-command_files/footer.png" class="footer"> |
| </div> |
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