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href="#1_Methodsfromrawoutchannel"> <link title="Additional control methods" rel="Section" href="#1_Additionalcontrolmethods"> <title>Ocamlnet 2 Reference Manual : Uq_engines.async_out_channel</title> </head> <body> <div class="navbar"><a href="Uq_engines.engine.html">Previous</a> <a href="Uq_engines.html">Up</a> <a href="Uq_engines.async_in_channel.html">Next</a> </div> <center><h1>Class type <a href="type_Uq_engines.async_out_channel.html">Uq_engines.async_out_channel</a></h1></center> <br> <pre><span class="keyword">class type</span> <a name="TYPEasync_out_channel"></a>async_out_channel = <code class="code">object</code> <a href="Uq_engines.async_out_channel.html">..</a> <code class="code">end</code></pre>An asynchrounous output channel provides methods to output data to a stream descriptor. It is based on <code class="code">raw_out_channel</code>, which is defined by the Ocamlnet module <code class="code">Netchannels</code> (see there for an introduction into the idea of using objects as I/O channels). An asynchronous channel can indicate that there is no space in the output buffer. Furthermore, one can request notification in the case that there is no space or again space in the output buffer.<br> <hr width="100%"> <a name="1_Methodsfromrawoutchannel"></a> <h1>Methods from <code class="code">raw_out_channel</code> </h1><pre><span class="keyword">method</span> <a name="METHODoutput"></a>output : <code class="type">string -> int -> int -> int</code></pre><div class="info"> <code class="code">output s k n</code>: Writes the substring of <code class="code">s</code> beginning at index <code class="code">k</code> with length <code class="code">n</code> into the channel. The channel is free to accept only a portion of the string (or even nothing), and returns the number of bytes it accepts.<br> </div> <pre><span class="keyword">method</span> <a name="METHODclose_out"></a>close_out : <code class="type">unit -> unit</code></pre><div class="info"> Closes the channel<br> </div> <pre><span class="keyword">method</span> <a name="METHODpos_out"></a>pos_out : <code class="type">int</code></pre><div class="info"> Returns the number of characters output into the channel<br> </div> <pre><span class="keyword">method</span> <a name="METHODflush"></a>flush : <code class="type">unit -> unit</code></pre><div class="info"> Flushes the channel. Asynchronous channels usually ignore flush requests. A potential meaning of flushing could be that no more data are accepted until the current buffer is completely processed. Implementing this is optional.<br> </div> <a name="1_Additionalcontrolmethods"></a> <h1>Additional control methods</h1><pre><span class="keyword">method</span> <a name="METHODcan_output"></a>can_output : <code class="type">bool</code></pre><div class="info"> Whether output is possible, i.e. the output method accepts at least one byte<br> </div> <pre><span class="keyword">method</span> <a name="METHODrequest_notification"></a>request_notification : <code class="type">(unit -> bool) -> unit</code></pre><div class="info"> After the notification has been requested, the passed function is be called whenever <code class="code">can_output</code> changes its value (or might change its value). The function returns <code class="code">true</code> if there is still interest in notification, and <code class="code">false</code> if notification must be disabled. <p> There can be any number of parallel active notifications. It is allowed that a notification callback requests further notifications.<br> </div> </body></html>
