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<!DOCTYPE html>
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<div class='vhub' style='margin-top:10px;margin-right:20px;text-align:left;background-color:white;'><a href='https://rimstone-lang.com' style='border-bottom:0px'><img src='https://rimstone-lang.com/rimstone.png' style='width:180px;height:auto'/></a></div><div class='vhub' style='margin-top:10px;'>First In First Out (FIFO) example</div><hr/><br/>
RimStone has built-in FIFO list type. You can create a FIFO variable and then store key/value string pairs in it, which you can then read back in the order you put them in. You can also rewind the FIFO list and obtain the same key/value pairs over and over again if needed.<br/>
<br/>
This is an example of FIFO list usage. This small command-line application will store key/value pairs "key1"/"value1" and "key2"/"value2" and then obtain them twice.<br/>
<br/>
First, let's create a directory for our application:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_153' class=notranslate>
<span class="Statement">mkdir</span> test-list
<span class="Statement">cd</span> test-list/</pre>
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</div><br/>
And then create the application itself:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_154' class=notranslate>
rim <span class="Special">-k</span> list-app</pre>
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</div><br/>
The RimStone code will be in file "list.rim":<br/>
<div class='code' style='position:relative;padding-right:16px;'>
<pre id='code_152' class=notranslate>
cat << '<span class="Constant">EOF</span>' > list.rim
<span class="Statement">begin-handler</span> /list
<span class="Statement"> silent-header</span>
<span class="Comment">// Create a list</span>
<span class="Statement"> new-fifo</span> mylist
<span class="Comment">// Add data to the list</span>
<span class="Statement"> write-fifo</span> mylist<span class="Identifier"> key</span> <span class="Constant">"key1"</span><span class="Identifier"> value</span> <span class="Constant">"value1"</span>
<span class="Statement"> write-fifo</span> mylist<span class="Identifier"> key</span> <span class="Constant">"key2"</span><span class="Identifier"> value</span> <span class="Constant">"value2"</span>
<span class="Statement"> start-loop</span>
<span class="Comment">// Get data from the list</span>
<span class="Statement"> read-fifo</span> mylist<span class="Type"> key</span> k<span class="Type"> value</span> v<span class="Type"> status</span> st
<span class="Comment">// Check if no more data</span>
<span class="Statement"> if-true</span> st<span class="Identifier"> not-equal</span> RIM_OKAY
<span class="Statement"> break-loop</span>
<span class="Statement"> end-if</span>
<span class="Statement"> @</span>Obtained key <span class="Statement"><<print-out</span> k<span class="Statement">>></span> with value <span class="Statement"><<print-out</span> v<span class="Statement">>></span>
<span class="Statement"> end-loop</span>
<span class="Comment">// Go through the list again, use rewind-fifo for that</span>
<span class="Statement"> rewind-fifo</span> mylist
<span class="Statement"> start-loop</span>
<span class="Statement"> read-fifo</span> mylist<span class="Type"> key</span> k<span class="Type"> value</span> v<span class="Type"> status</span> st
<span class="Statement"> if-true</span> st<span class="Identifier"> not-equal</span> RIM_OKAY
<span class="Statement"> break-loop</span>
<span class="Statement"> end-if</span>
<span class="Statement"> @</span>Again obtained key <span class="Statement"><<print-out</span> k<span class="Statement">>></span> with value <span class="Statement"><<print-out</span> v<span class="Statement">>></span>
<span class="Statement"> end-loop</span>
<span class="Comment">// Delete FIFO list</span>
<span class="Statement"> purge-fifo</span> mylist
<span class="Statement">end-handler</span>
<span class="Constant">EOF</span></pre>
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</div><br/>
The code above uses <a href='https://rimstone-lang.com/new-fifo.html'>new-fifo</a> statement to create a FIFO variable, <a href='https://rimstone-lang.com/write-fifo.html'>write-fifo</a> to add key/value pairs to it, and <a href='https://rimstone-lang.com/read-fifo.html'>read-fifo</a> to obtain them back in the order they were put in. You can use <a href='https://rimstone-lang.com/rewind-fifo.html'>rewind-fifo</a> to rewind back to the beginning at any time, as many times as you need.<br/>
<br/>
Make the executable:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_155' class=notranslate>
rim <span class="Special">-q</span> <span class="Special">--public</span></pre>
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</div><br/>
Execute the program:<br/>
<div class="shcode" style='position:relative;padding-right:16px;'>
<pre id='code_156' class=notranslate>
rim <span class="Special">-r</span> <span class="Special">--req</span><span class="Statement">=</span><span class="Statement">"</span><span class="Constant">/list</span><span class="Statement">"</span> <span class="Special">--app</span><span class="Statement">=</span><span class="Statement">"</span><span class="Constant">/list-app</span><span class="Statement">"</span> <span class="Special">--exec</span></pre>
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</div><br/>
The result is as expected:<br/>
<div class='ncode' style='position:relative;padding-right:16px;'>
<pre id='code_151' class=notranslate>
Obtained key key1 with value value1
Obtained key key2 with value value2
Again obtained key key1 with value value1
Again obtained key key2 with value value2</pre>
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