63 lines
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63 lines
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HTML
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is basically a container for classes extending StrolchComponent with a life
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cycle. These classes mostly implement an interface which describes the
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operations that are supported by the component.</p><p>The following represents a list of the most used components:</p><ul><li><code>RealmHandler</code>: li.strolch.agent.impl.DefaultRealmHandler</li><li><code>PrivilegeHandler</code>: li.strolch.runtime.privilege.DefaultStrolchPrivilegeHandler</li><li><code>EnumHandler</code>: li.strolch.runtime.query.enums.DefaultEnumHandler</li><li><code>PolicyHandler</code>: li.strolch.policy.DefaultPolicyHandler</li><li><code>ServiceHandler</code>: li.strolch.service.api.DefaultServiceHandler</li><li><code>StrolchSessionHandler</code>: li.strolch.rest.DefaultStrolchSessionHandler</li><li><code>PersistenceHandler</code>: multiple implementations</li><li><code>PostInitializer</code>: project specific implementation</li><li><code>MailHandler</code>: li.strolch.handler.mail.SmtpMailHandler</li></ul><p>A component has a life-cycle, which is governed by the Agent’s own life-cycle.
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The life-cycle is as follows:</p><pre><code>setup -> initialize -> start <-> stop -> destroy
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</code></pre><p>The setup step is used to instantiate the component, the initialize step is
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used to validate configuration parameters, and the run step is used to start
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the component, i.e. start threads, etc. The stop step stops these threads and
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also allows the component to be started again. The destroy step destroys the
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instance and makes it unusable anymore, i.e. shutdown of the agent.</p><p>Each component has its own configuration parameters. A component is
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registered in the <code>StrolchConfiguration.xml</code> file with a</p><ul><li>name</li><li>api class name</li><li>implementation class name</li><li>configuration parameters</li><li>any required dependencies</li></ul><p>The dependencies is an important feature as the dependencies of a component
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are always started before the actual component.</p><p>By example of the <code>MailHandler</code> we shall show how a strolch component would
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be implemented.</p><p>First define an interface:</p><div class=highlight><pre style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=color:#66d9ef>public</span> <span style=color:#66d9ef>interface</span> <span style=color:#a6e22e>MailHandler</span> <span style=color:#f92672>{</span>
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<span style=color:#66d9ef>void</span> <span style=color:#a6e22e>sendMail</span><span style=color:#f92672>(</span>String subject<span style=color:#f92672>,</span> String text<span style=color:#f92672>,</span> String recipient<span style=color:#f92672>);</span>
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<span style=color:#f92672>}</span>
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</code></pre></div><p>Then implement a concrete <code>MailHandler</code>:</p><div class=highlight><pre style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java><span style=color:#66d9ef>public</span> <span style=color:#66d9ef>class</span> <span style=color:#a6e22e>SmtpMailHandler</span> <span style=color:#66d9ef>extends</span> StrolchComponent <span style=color:#66d9ef>implements</span> MailHandler <span style=color:#f92672>{</span>
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<span style=color:#75715e>// instance fields with configuration properties to send the mail
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</span><span style=color:#75715e></span>
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<span style=color:#66d9ef>public</span> <span style=color:#a6e22e>SmtpMailHandler</span><span style=color:#f92672>(</span>ComponentContainer container<span style=color:#f92672>,</span> String componentName<span style=color:#f92672>)</span> <span style=color:#f92672>{</span>
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<span style=color:#66d9ef>super</span><span style=color:#f92672>(</span>container<span style=color:#f92672>,</span> componentName<span style=color:#f92672>);</span>
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<span style=color:#f92672>}</span>
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<span style=color:#a6e22e>@Override</span>
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<span style=color:#66d9ef>public</span> <span style=color:#66d9ef>void</span> <span style=color:#a6e22e>initialize</span><span style=color:#f92672>(</span>ComponentConfiguration configuration<span style=color:#f92672>)</span> <span style=color:#66d9ef>throws</span> Exception <span style=color:#f92672>{</span>
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<span style=color:#75715e>// store any properties needed from the configuration
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</span><span style=color:#75715e></span>
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<span style=color:#66d9ef>super</span><span style=color:#f92672>.</span><span style=color:#a6e22e>initialize</span><span style=color:#f92672>(</span>configuration<span style=color:#f92672>);</span>
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<span style=color:#f92672>}</span>
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<span style=color:#a6e22e>@Override</span>
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<span style=color:#66d9ef>public</span> <span style=color:#66d9ef>void</span> <span style=color:#a6e22e>sendMail</span><span style=color:#f92672>(</span>String subject<span style=color:#f92672>,</span> String text<span style=color:#f92672>,</span> String recipient<span style=color:#f92672>)</span> <span style=color:#f92672>{</span>
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<span style=color:#75715e>// send the e-mail using SMTP, or store in stack to send by thread
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</span><span style=color:#75715e></span> <span style=color:#f92672>}</span>
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<span style=color:#f92672>}</span>
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</code></pre></div><p>Now that the component is written, it must be registered on the component, so
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that it is loaded when the agent is started. For this the
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<code>StrolchConfiguration.xml</code> file must be modified to include a component
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element:</p><div class=highlight><pre style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-xml data-lang=xml><span style=color:#f92672><StrolchConfiguration></span>
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<span style=color:#f92672><env</span> <span style=color:#a6e22e>id=</span><span style=color:#e6db74>"dev"</span><span style=color:#f92672>></span>
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...
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<span style=color:#f92672><Component></span>
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<span style=color:#f92672><name></span>MailHandler<span style=color:#f92672></name></span>
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<span style=color:#f92672><api></span>li.strolch.handler.mail.MailHandler<span style=color:#f92672></api></span>
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<span style=color:#f92672><impl></span>li.strolch.handler.mail.SmtpMailHandler<span style=color:#f92672></impl></span>
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<span style=color:#f92672><Properties></span>
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<span style=color:#f92672><username></span>test<span style=color:#f92672></username></span>
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<span style=color:#f92672><password></span>test<span style=color:#f92672></password></span>
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<span style=color:#f92672><hostName></span>localhost<span style=color:#f92672></hostName></span>
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...
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<span style=color:#f92672></Properties></span>
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<span style=color:#f92672></Component></span>
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...
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<span style=color:#f92672></env></span>
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<span style=color:#f92672></StrolchConfiguration></span>
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</code></pre></div><p>Now when the agent is started, the component can be retrieved and used.
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E.g from inside a Service:</p><div class=highlight><pre style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-java data-lang=java>MailHandler mailHandler <span style=color:#f92672>=</span> getComponent<span style=color:#f92672>(</span>MailHandler<span style=color:#f92672>.</span><span style=color:#a6e22e>class</span><span style=color:#f92672>);</span>
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mailHandler<span style=color:#f92672>.</span><span style=color:#a6e22e>sendMail</span><span style=color:#f92672>(</span><span style=color:#e6db74>"My Subject"</span><span style=color:#f92672>,</span> <span style=color:#e6db74>"Hello World"</span><span style=color:#f92672>,</span> <span style=color:#e6db74>"test@test.ch"</span><span style=color:#f92672>);</span>
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</code></pre></div><footer class=footline></footer></div></div><div id=navigation><a class="nav nav-prev" href=/documentation/realms/ title=Realms><i class="fa fa-chevron-left"></i></a><a class="nav nav-next" href=/documentation/services-and-commands/ title="Services and Commands" style=margin-right:0><i class="fa fa-chevron-right"></i></a></div></section><div style=left:-1000px;overflow:scroll;position:absolute;top:-1000px;border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px><div style=border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px></div></div><script src=/js/clipboard.min.js?1626091328></script><script src=/js/perfect-scrollbar.min.js?1626091328></script><script src=/js/perfect-scrollbar.jquery.min.js?1626091328></script><script src=/js/jquery.sticky.js?1626091328></script><script src=/js/featherlight.min.js?1626091328></script><script src=/js/highlight.pack.js?1626091328></script><script>hljs.initHighlightingOnLoad();</script><script src=/js/modernizr.custom-3.6.0.js?1626091328></script><script src=/js/learn.js?1626091328></script><script src=/js/hugo-learn.js?1626091328></script><script src=/mermaid/mermaid.js?1626091328></script><script>mermaid.initialize({startOnLoad:true});</script></body></html> |