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| <h1>scheduled_send_03.cpp</h1> |
| <div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">"options.hpp"</span><span class="cp"></span> |
| |
| <span class="cp">#include</span> <span class="cpf"><proton/container.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/connection.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/duration.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/message.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/messaging_handler.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/sender.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/tracker.hpp></span><span class="cp"></span> |
| <span class="cp">#include</span> <span class="cpf"><proton/work_queue.hpp></span><span class="cp"></span> |
| |
| <span class="cp">#include</span> <span class="cpf"><iostream></span><span class="cp"></span> |
| |
| <span class="cp">#include</span> <span class="cpf">"fake_cpp11.hpp"</span><span class="cp"></span> |
| |
| <span class="c1">// Send messages at a constant rate one per interval. cancel after a timeout.</span> |
| <span class="c1">// This example uses only C++03 features.</span> |
| <span class="k">class</span> <span class="nc">scheduled_sender</span> <span class="o">:</span> <span class="k">public</span> <span class="n">proton</span><span class="o">::</span><span class="n">messaging_handler</span> <span class="p">{</span> |
| <span class="k">private</span><span class="o">:</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">url</span><span class="p">;</span> |
| <span class="n">proton</span><span class="o">::</span><span class="n">duration</span> <span class="n">interval</span><span class="p">,</span> <span class="n">timeout</span><span class="p">;</span> |
| <span class="n">proton</span><span class="o">::</span><span class="n">work_queue</span> <span class="o">*</span><span class="n">work_queue</span><span class="p">;</span> |
| <span class="kt">bool</span> <span class="n">ready</span><span class="p">,</span> <span class="n">canceled</span><span class="p">;</span> |
| |
| <span class="k">public</span><span class="o">:</span> |
| <span class="n">scheduled_sender</span><span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="o">&</span><span class="n">s</span><span class="p">,</span> <span class="kt">double</span> <span class="n">d</span><span class="p">,</span> <span class="kt">double</span> <span class="n">t</span><span class="p">)</span> <span class="o">:</span> |
| <span class="n">url</span><span class="p">(</span><span class="n">s</span><span class="p">),</span> |
| <span class="n">interval</span><span class="p">(</span><span class="kt">int</span><span class="p">(</span><span class="n">d</span><span class="o">*</span><span class="n">proton</span><span class="o">::</span><span class="n">duration</span><span class="o">::</span><span class="n">SECOND</span><span class="p">.</span><span class="n">milliseconds</span><span class="p">())),</span> <span class="c1">// Send interval.</span> |
| <span class="n">timeout</span><span class="p">(</span><span class="kt">int</span><span class="p">(</span><span class="n">t</span><span class="o">*</span><span class="n">proton</span><span class="o">::</span><span class="n">duration</span><span class="o">::</span><span class="n">SECOND</span><span class="p">.</span><span class="n">milliseconds</span><span class="p">())),</span> <span class="c1">// Cancel after timeout.</span> |
| <span class="n">work_queue</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span> |
| <span class="n">ready</span><span class="p">(</span><span class="nb">true</span><span class="p">),</span> <span class="c1">// Ready to send.</span> |
| <span class="n">canceled</span><span class="p">(</span><span class="nb">false</span><span class="p">)</span> <span class="c1">// Canceled.</span> |
| <span class="p">{}</span> |
| |
| <span class="kt">void</span> <span class="n">on_container_start</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">container</span> <span class="o">&</span><span class="n">c</span><span class="p">)</span> <span class="n">OVERRIDE</span> <span class="p">{</span> |
| <span class="n">c</span><span class="p">.</span><span class="n">open_sender</span><span class="p">(</span><span class="n">url</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="kt">void</span> <span class="n">on_sender_open</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">sender</span> <span class="o">&</span> <span class="n">s</span><span class="p">)</span> <span class="n">OVERRIDE</span> <span class="p">{</span> |
| <span class="n">work_queue</span> <span class="o">=</span> <span class="o">&</span><span class="n">s</span><span class="p">.</span><span class="n">work_queue</span><span class="p">();</span> |
| |
| <span class="n">work_queue</span><span class="o">-></span><span class="n">schedule</span><span class="p">(</span><span class="n">timeout</span><span class="p">,</span> <span class="n">make_work</span><span class="p">(</span><span class="o">&</span><span class="n">scheduled_sender</span><span class="o">::</span><span class="n">cancel</span><span class="p">,</span> <span class="k">this</span><span class="p">,</span> <span class="n">s</span><span class="p">));</span> |
| <span class="n">work_queue</span><span class="o">-></span><span class="n">schedule</span><span class="p">(</span><span class="n">interval</span><span class="p">,</span> <span class="n">make_work</span><span class="p">(</span><span class="o">&</span><span class="n">scheduled_sender</span><span class="o">::</span><span class="n">tick</span><span class="p">,</span> <span class="k">this</span><span class="p">,</span> <span class="n">s</span><span class="p">));</span> |
| <span class="p">}</span> |
| |
| <span class="kt">void</span> <span class="n">cancel</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">sender</span> <span class="n">sender</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">canceled</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span> |
| <span class="n">sender</span><span class="p">.</span><span class="n">connection</span><span class="p">().</span><span class="n">close</span><span class="p">();</span> |
| <span class="p">}</span> |
| |
| <span class="kt">void</span> <span class="n">tick</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">sender</span> <span class="n">sender</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">canceled</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">work_queue</span><span class="o">-></span><span class="n">schedule</span><span class="p">(</span><span class="n">interval</span><span class="p">,</span> <span class="n">make_work</span><span class="p">(</span><span class="o">&</span><span class="n">scheduled_sender</span><span class="o">::</span><span class="n">tick</span><span class="p">,</span> <span class="k">this</span><span class="p">,</span> <span class="n">sender</span><span class="p">));</span> <span class="c1">// Next tick</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">sender</span><span class="p">.</span><span class="n">credit</span><span class="p">()</span> <span class="o">></span> <span class="mi">0</span><span class="p">)</span> <span class="c1">// Only send if we have credit</span> |
| <span class="n">send</span><span class="p">(</span><span class="n">sender</span><span class="p">);</span> |
| <span class="k">else</span> |
| <span class="n">ready</span> <span class="o">=</span> <span class="nb">true</span><span class="p">;</span> <span class="c1">// Set the ready flag, send as soon as we get credit.</span> |
| <span class="p">}</span> |
| <span class="p">}</span> |
| |
| <span class="kt">void</span> <span class="n">on_sendable</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">sender</span> <span class="o">&</span><span class="n">sender</span><span class="p">)</span> <span class="n">OVERRIDE</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">ready</span><span class="p">)</span> <span class="c1">// We have been ticked since the last send.</span> |
| <span class="n">send</span><span class="p">(</span><span class="n">sender</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="kt">void</span> <span class="n">send</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">sender</span><span class="o">&</span> <span class="n">sender</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="s">"send"</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span> |
| <span class="n">sender</span><span class="p">.</span><span class="n">send</span><span class="p">(</span><span class="n">proton</span><span class="o">::</span><span class="n">message</span><span class="p">(</span><span class="s">"ping"</span><span class="p">));</span> |
| <span class="n">ready</span> <span class="o">=</span> <span class="nb">false</span><span class="p">;</span> |
| <span class="p">}</span> |
| <span class="p">};</span> |
| |
| |
| <span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">address</span><span class="p">(</span><span class="s">"127.0.0.1:5672/examples"</span><span class="p">);</span> |
| <span class="kt">double</span> <span class="n">interval</span> <span class="o">=</span> <span class="mf">1.0</span><span class="p">;</span> |
| <span class="kt">double</span> <span class="n">timeout</span> <span class="o">=</span> <span class="mf">5.0</span><span class="p">;</span> |
| |
| <span class="n">example</span><span class="o">::</span><span class="n">options</span> <span class="n">opts</span><span class="p">(</span><span class="n">argc</span><span class="p">,</span> <span class="n">argv</span><span class="p">);</span> |
| |
| <span class="n">opts</span><span class="p">.</span><span class="n">add_value</span><span class="p">(</span><span class="n">address</span><span class="p">,</span> <span class="sc">'a'</span><span class="p">,</span> <span class="s">"address"</span><span class="p">,</span> <span class="s">"connect and send to URL"</span><span class="p">,</span> <span class="s">"URL"</span><span class="p">);</span> |
| <span class="n">opts</span><span class="p">.</span><span class="n">add_value</span><span class="p">(</span><span class="n">interval</span><span class="p">,</span> <span class="sc">'i'</span><span class="p">,</span> <span class="s">"interval"</span><span class="p">,</span> <span class="s">"send a message every INTERVAL seconds"</span><span class="p">,</span> <span class="s">"INTERVAL"</span><span class="p">);</span> |
| <span class="n">opts</span><span class="p">.</span><span class="n">add_value</span><span class="p">(</span><span class="n">timeout</span><span class="p">,</span> <span class="sc">'t'</span><span class="p">,</span> <span class="s">"timeout"</span><span class="p">,</span> <span class="s">"stop after T seconds"</span><span class="p">,</span> <span class="s">"T"</span><span class="p">);</span> |
| |
| <span class="k">try</span> <span class="p">{</span> |
| <span class="n">opts</span><span class="p">.</span><span class="n">parse</span><span class="p">();</span> |
| <span class="n">scheduled_sender</span> <span class="n">h</span><span class="p">(</span><span class="n">address</span><span class="p">,</span> <span class="n">interval</span><span class="p">,</span> <span class="n">timeout</span><span class="p">);</span> |
| <span class="n">proton</span><span class="o">::</span><span class="n">container</span><span class="p">(</span><span class="n">h</span><span class="p">).</span><span class="n">run</span><span class="p">();</span> |
| <span class="k">return</span> <span class="mi">0</span><span class="p">;</span> |
| <span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="k">const</span> <span class="n">example</span><span class="o">::</span><span class="n">bad_option</span><span class="o">&</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="n">opts</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span> <span class="o"><<</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span> |
| <span class="p">}</span> <span class="k">catch</span> <span class="p">(</span><span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">exception</span><span class="o">&</span> <span class="n">e</span><span class="p">)</span> <span class="p">{</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o"><<</span> <span class="n">e</span><span class="p">.</span><span class="n">what</span><span class="p">()</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span> |
| <span class="p">}</span> |
| |
| <span class="k">return</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| |
| <p><a href="scheduled_send_03.cpp">Download this file</a></p> |
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