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| <head><title>HelloWorld for Java</title> |
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| <h3 class="sectionHead"><span class="titlemark">2.3 </span> <a |
| id="x9-280003"></a>HelloWorld for Java</h3> |
| <!--l. 3--><p class="noindent" >In this tutorial you will get a first look at a very simple eTrice model. The goal is to learn the work flow of eTrice and to |
| understand a few basic features of ROOM. |
| </p><!--l. 5--><p class="noindent" ><span |
| class="ec-lmssbx-10">Preconditions</span>: </p> |
| <ul class="itemize1"> |
| <li class="itemize">Installed JDT Eclipse |
| </li> |
| <li class="itemize">Activated <span |
| class="ec-lmsso-10">Build Automatically </span>option in Eclipse: <span |
| class="ec-lmsso-10">Project -> Build Automatically</span> |
| </li> |
| <li class="itemize">Recommended: Activate automatic resource refresh in Eclipse: <span |
| class="ec-lmsso-10">Window -> Preferences -> General -></span> |
| <span |
| class="ec-lmsso-10">Workspace</span> |
| <ul class="itemize2"> |
| <li class="itemize"><span |
| class="ec-lmsso-10">Refresh using native hooks or polling</span> |
| </li> |
| <li class="itemize"><span |
| class="ec-lmsso-10">Refresh on access</span></li></ul> |
| </li> |
| <li class="itemize">Optional: Install <a |
| href="http://trace2uml.stage.tigris.org/" >Trace2UML</a>, a Open Source MSC viewer |
| <ul class="itemize2"> |
| <li class="itemize"><a |
| href="http://trace2uml.tigris.org/servlets/ProjectDocumentList?folderID=6208" >Windows download site</a> |
| </li> |
| <li class="itemize"><a |
| href="http://apt.astade.de/" >Linux package</a></li></ul> |
| </li></ul> |
| <a |
| id="x9-28001r43"></a> |
| <h4 class="subsectionHead"><span class="titlemark">2.3.1 </span> <a |
| id="x9-290001"></a>Create template project</h4> |
| <!--l. 23--><p class="noindent" >After installation of eTricein Eclipse, we can use the wizard to create the template project, which is good starting point for |
| new ROOM applications. Select the menu <span |
| class="ec-lmsso-10">File -> New -> Other </span>(Ctrl+N) and choose <span |
| class="ec-lmsso-10">eTrice Java Template Project</span>. |
| Name the project <span |
| class="ec-lmsso-10">TemplateModel </span>and press <span |
| class="ec-lmsso-10">Next</span>. On the next page select <span |
| class="ec-lmsso-10">use Eclipse JDT build </span>and press |
| <span |
| class="ec-lmsso-10">Finish</span>. |
| </p><!--l. 25--><p class="noindent" ><img |
| src="images/014-wizard.png" alt="PIC" |
| /> |
| </p><!--l. 27--><p class="noindent" >This will add three projects into your workspace, the library projects <span |
| class="ec-lmsso-10">runtime.java </span>and <span |
| class="ec-lmsso-10">modellib.java </span>and our application |
| project <span |
| class="ec-lmsso-10">TemplateModel</span>. Now open the <span |
| class="ec-lmsso-10">TemplateModel.room </span>in the model folder of our project. |
| </p><!--l. 29--><p class="noindent" ><img |
| src="images/014-after-wizard.png" alt="PIC" |
| /> |
| </p><!--l. 31--><p class="noindent" >The model contains an ActorClass <span |
| class="ec-lmsso-10">TopActor</span>, which is currently the only active actor. TopActor has a state machine that is |
| intended to output a simple HelloWorld statement. To inspect its behavior graphically, we can open the behavior diagram by |
| right click on <span |
| class="ec-lmsso-10">Outline View -> TopActor -> Edit Behavior</span>. Alternatively we can place the cursor within the textual notation |
| and press Alt+B. |
| </p><!--l. 33--><p class="noindent" ><img |
| src="images/014-open-hello-fsm.png" alt="PIC" |
| /> |
| </p><!--l. 35--><p class="noindent" >The state machine has an initial transition that leads to <span |
| class="ec-lmsso-10">helloState</span>. The state defines an entry code, which is executed during |
| the transition. We can view the details by hovering over the state and edit the code with a double-click or right click and <span |
| class="ec-lmsso-10">Edit</span> |
| <span |
| class="ec-lmsso-10">State</span>. |
| </p><!--l. 37--><p class="noindent" ><img |
| src="images/014-hello-fsm.png" alt="PIC" |
| /> |
| <a |
| id="x9-29001r45"></a> |
| |
| |
| </p> |
| <h4 class="subsectionHead"><span class="titlemark">2.3.2 </span> <a |
| id="x9-300002"></a>Generate and run application</h4> |
| <!--l. 41--><p class="noindent" >Now we are ready to translate the model into an executable application. The first step is to generate source files from the |
| model. Therefore we run the eTrice model generator by right click on file |
| </p><div class="quote"> |
| <!--l. 42--><p class="noindent" ><span |
| class="ec-lmsso-10">generate_TemplateModel.launch -> Run As -> generate_TemplateModel</span>.</p></div> |
| <!--l. 44--><p class="noindent" >After that we can build and run the application by right click on file |
| </p><div class="quote"> |
| <!--l. 46--><p class="noindent" ><span |
| class="ec-lmsso-10">run_TemplateModel.launch -> Run As -> run_TemplateModel</span></p></div> |
| <!--l. 47--><p class="noindent" >. This will trigger the build process, carried out by JDT Eclipse and then subsequently start our application. |
| </p> |
| <div class="tabular"> <table id="TBL-3" class="tabular" |
| cellspacing="0" cellpadding="0" |
| ><colgroup id="TBL-3-1g"><col |
| id="TBL-3-1" /><col |
| id="TBL-3-2" /></colgroup><tr |
| style="vertical-align:baseline;" id="TBL-3-1-"><td style="white-space:nowrap; text-align:center;" id="TBL-3-1-1" |
| class="td11"> <img |
| src="images/014-generate.png" alt="PIC" |
| /> </td><td style="white-space:nowrap; text-align:center;" id="TBL-3-1-2" |
| class="td11"> <img |
| src="images/014-build_run.png" alt="PIC" |
| /> </td> |
| </tr><tr |
| style="vertical-align:baseline;" id="TBL-3-2-"><td style="white-space:nowrap; text-align:center;" id="TBL-3-2-1" |
| class="td11"> 1. Invoke generator </td><td style="white-space:nowrap; text-align:center;" id="TBL-3-2-2" |
| class="td11"> 2. Build and run application </td> |
| </tr></table> |
| </div> |
| <!--l. 56--><p class="noindent" >The output of our application is logged in the Console View and it shows the "Hello World". By typing "quit", as prompt, and |
| pressing enter, the application terminates regularly. |
| </p><!--l. 58--><p class="noindent" ><img |
| src="images/014-quit-hello-msc.png" alt="PIC" |
| /> |
| <a |
| id="x9-30001r46"></a> |
| </p> |
| <h4 class="subsectionHead"><span class="titlemark">2.3.3 </span> <a |
| id="x9-310003"></a>Open the Message Sequence Chart</h4> |
| <!--l. 3--><p class="noindent" >After termination, we can inspect the behavior of our application. It is recorded in the form of a MSC (Message Sequence |
| Chart) and can now be used for debugging or documentation purpose. Open <span |
| class="ec-lmsso-10">msc.seq </span>or <span |
| class="ec-lmsso-10">subSystemRef_Async.seq </span>in the |
| folder <span |
| class="ec-lmsso-10">log </span>using the tool Trace2UML. |
| </p><div class="quote"> |
| <!--l. 6--><p class="noindent" >If Trace2UML (Open Source tool) is not already installed, it can be obtained here: <a |
| href="http://trace2uml.tigris.org/servlets/ProjectDocumentList?folderID=6208" >Windows download |
| site</a> or <a |
| href="http://apt.astade.de/" >Linux package of the Astade UML tool containing Trace2UML</a></p></div> |
| <!--l. 10--><p class="noindent" >Yet the MSC is nearly empty having not recorded any interaction between actors. It shows that <span |
| class="ec-lmsso-10">topActor </span>(full |
| instance path <span |
| class="ec-lmsso-10">/LogSys/subSystemRef/topActor</span>) has taken <span |
| class="ec-lmsso-10">helloState</span>. In the next PingPong tutorial we are |
| going to create a more sophisticated and vivid eTriceapplication introducing actor building blocks and message |
| protocols. |
| </p><!--l. 62--><p class="noindent" ><img |
| src="images/014-hello-msc.png" alt="PIC" |
| /> |
| |
| |
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