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| <h1 id="apache-celix-containers">Apache Celix Containers</h1> |
| <p>Apache Celix containers are executables which starts an Apache Celix framework, with an embedded set of properties |
| and an embedded set of bundles. |
| Although it is also possible to create and start an Apache Celix framework in code, the benefit of an Apache Celix |
| Container is that this can be done with a single <code>add_celix_container</code> Apache Celix CMake command.</p> |
| <p>The <code>add_celix_container</code> Apache Celix CMake command eventually uses the CMake <code>add_executable</code> with the same |
| target name. As result, it is possible to handle an Apache Celix Container as a normal CMake executable |
| (e.g. use <code>target_link_libraries</code>) and also ensures that the CLion IDE detects the containers as an executable.</p> |
| <p>For a complete list of options the <code>add_celix_container</code> Apache Celix CMake command supports, see the |
| <a href="cmake_commands">Apache Celix CMake Commands documentation</a></p> |
| <h2 id="generated-main-source-files">Generated main source files</h2> |
| <p>The main purpose of the <code>add_celix_container</code> Apache Celix CMake command is to generate a main source file |
| which starts an Apache Celix framework with a set of preconfigured properties and set of preconfigured bundles.</p> |
| <p>For example the following (empty) Apache Celix Container:</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-CMake" data-lang="CMake"><span style="display:flex;"><span><span style="color:#a2f">add_celix_container</span>(<span style="color:#b44">my_empty_container</span>)<span style=""> |
| </span></span></span></code></pre></div><p>will create the following main source file (note: reformatted for display purpose):</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-C++" data-lang="C++"><span style="display:flex;"><span><span style="color:#080;font-style:italic">//${CMAKE_BINARY_DIR}/celix/gen/containers/my_empty_container/main.cc |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"></span><span style="color:#080">#include</span> <span style="color:#080"><celix_launcher.h></span><span style="color:#080"> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080"></span><span style="color:#0b0;font-weight:bold">int</span> <span style="color:#00a000">main</span>(<span style="color:#0b0;font-weight:bold">int</span> argc, <span style="color:#0b0;font-weight:bold">char</span> <span style="color:#666">*</span>argv[]) { |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">const</span> <span style="color:#0b0;font-weight:bold">char</span> <span style="color:#666">*</span> config <span style="color:#666">=</span> <span style="color:#b44">"\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_CONTAINER_NAME=my_empty_container</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_BUNDLES_PATH=bundles</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">"</span>; |
| </span></span><span style="display:flex;"><span> celix_properties_t <span style="color:#666">*</span>embeddedProps <span style="color:#666">=</span> celix_properties_loadFromString(config); |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">return</span> celixLauncher_launchAndWaitForShutdown(argc, argv, embeddedProps); |
| </span></span><span style="display:flex;"><span>} |
| </span></span></code></pre></div><p>Note that because the source file is a C++ source file (.cc extension) the executable will be compiled with a C++ |
| compiler.</p> |
| <p>To create C Apache Celix Containers, use the <code>C</code> option in the <code>add_celix_container</code> Apache Celix CMake command; |
| This will generate a <code>main.c</code> instead of <code>main.cc</code> source file:</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-CMake" data-lang="CMake"><span style="display:flex;"><span><span style="color:#a2f">add_celix_container</span>(<span style="color:#b44">my_empty_container</span> <span style="color:#b44">C</span>)<span style=""> |
| </span></span></span></code></pre></div><p>When an Apache Celix Container is also configured with framework properties and/or auto start of bundles, the |
| generated main source file will add these properties as embedded framework properties.</p> |
| <p>For example the following <code>add_celix_container</code> Apache Celix CMake command:</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-CMake" data-lang="CMake"><span style="display:flex;"><span><span style="color:#a2f">add_celix_container</span>(<span style="color:#b44">my_web_shell_container</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">BUNDLES</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">Celix::http_admin</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">Celix::shell</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">Celix::shell_wui</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">PROPERTIES</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">CELIX_LOGGING_DEFAULT_ACTIVE_LOG_LEVEL=debug</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#b44">CELIX_HTTP_ADMIN_LISTENING_PORTS=8888</span> |
| </span></span><span style="display:flex;"><span>)<span style=""> |
| </span></span></span></code></pre></div><p>will create the following main source file (note: reformatted for display purpose):</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-C++" data-lang="C++"><span style="display:flex;"><span><span style="color:#080">#include</span> <span style="color:#080"><celix_launcher.h></span><span style="color:#080"> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080"></span><span style="color:#0b0;font-weight:bold">int</span> <span style="color:#00a000">main</span>(<span style="color:#0b0;font-weight:bold">int</span> argc, <span style="color:#0b0;font-weight:bold">char</span> <span style="color:#666">*</span>argv[]) { |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">const</span> <span style="color:#0b0;font-weight:bold">char</span> <span style="color:#666">*</span> config <span style="color:#666">=</span> <span style="color:#b44">"\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_CONTAINER_NAME=my_web_shell_container</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_BUNDLES_PATH=bundles</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_AUTO_START_3=celix_http_admin-Debug.zip celix_shell-Debug.zip celix_shell_wui-Debug.zip</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_LOGGING_DEFAULT_ACTIVE_LOG_LEVEL=debug</span><span style="color:#b62;font-weight:bold">\n</span><span style="color:#b44">\ |
| </span></span></span><span style="display:flex;"><span><span style="color:#b44">CELIX_HTTP_ADMIN_LISTENING_PORTS=8888"</span>; |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> celix_properties_t <span style="color:#666">*</span>embeddedProps <span style="color:#666">=</span> celix_properties_loadFromString(config); |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">return</span> celixLauncher_launchAndWaitForShutdown(argc, argv, embeddedProps); |
| </span></span><span style="display:flex;"><span>} |
| </span></span></code></pre></div><h2 id="installing-celix-container">Installing Celix container</h2> |
| <p>Currently, installing Apache Celix containers (i.e. using <code>make install</code> on a Celix Container) is not supported.</p> |
| <p>The reason behind this is that an Apache Celix container depends on the location of bundles and there is currently no |
| reliable way to find bundles in a system. For this to work Apache Celix should support something like:</p> |
| <ul> |
| <li>A bundle search path concept like <code>LD_LIBRARY_PATH</code></li> |
| <li>Support for embedded bundles in an executable so that Apache Celix containers can be self containing</li> |
| <li>Bundles as shared libraries (instead of zip) so that the normal shared libraries concepts |
| (installation, <code>LD_LIBRARY_PATH</code>, etc ) can be reused.</li> |
| </ul> |
| <p>There is an exception when an installation of an Apache Celix containers works: If all used bundles are based on already |
| installed bundles and are added to the Apache Celix container with an absolute path (default).</p> |
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