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<div class="highlight"><pre><span class="kd">function</span> <span class="nx">main</span> <span class="p">(</span><span class="kt">string</span><span class="p">[]</span> <span class="nx">args</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="nx">i</span> <span class="p">=</span> <span class="mi">100</span><span class="p">;</span>
<span class="kt">string</span> <span class="nx">s</span> <span class="p">=</span> <span class="s">"WSO2"</span><span class="p">;</span>
<span class="kt">map</span> <span class="nx">m</span> <span class="p">=</span> <span class="p">{</span><span class="s">"name"</span><span class="p">:</span><span class="s">"Abhaya"</span><span class="p">,</span> <span class="s">"era"</span><span class="p">:</span><span class="s">"Anuradhapura"</span><span class="p">};</span>
<span class="k">fork</span> <span class="p">{</span>
<span class="kd">worker</span> <span class="nx">W1</span> <span class="p">{</span>
<span class="nx">i</span> <span class="p">=</span> <span class="mi">23</span><span class="p">;</span>
<span class="nx">m</span><span class="p">[</span><span class="s">"name"</span><span class="p">]</span> <span class="p">=</span> <span class="s">"Rajasinghe"</span><span class="p">;</span>
<span class="kt">string</span> <span class="nx">n</span> <span class="p">=</span> <span class="s">"Colombo"</span><span class="p">;</span>
<span class="nx">i</span><span class="p">,</span> <span class="nx">n</span> <span class="o">-></span> <span class="k">fork</span><span class="p">;</span>
<span class="p">}</span> <span class="kd">worker</span> <span class="nx">W2</span> <span class="p">{</span>
<span class="nx">s</span> <span class="p">=</span> <span class="s">"Ballerina"</span><span class="p">;</span>
<span class="nx">m</span><span class="p">[</span><span class="s">"era"</span><span class="p">]</span> <span class="p">=</span> <span class="s">"Kandy"</span><span class="p">;</span>
<span class="nx">s</span> <span class="o">-></span> <span class="k">fork</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span> <span class="k">join</span> <span class="p">(</span><span class="nx">all</span><span class="p">)</span> <span class="p">(</span><span class="kt">map</span> <span class="nx">results</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">any</span><span class="p">[]</span> <span class="nx">r1</span><span class="p">;</span>
<span class="kt">any</span><span class="p">[]</span> <span class="nx">r2</span><span class="p">;</span>
<span class="nx">r1</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">any</span><span class="p">[])</span><span class="nx">results</span><span class="p">[</span><span class="s">"W1"</span><span class="p">];</span>
<span class="nx">r2</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">any</span><span class="p">[])</span><span class="nx">results</span><span class="p">[</span><span class="s">"W2"</span><span class="p">];</span>
<span class="kt">int</span> <span class="nx">p</span><span class="p">;</span>
<span class="nx">p</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="nx">r1</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
<span class="kt">string</span> <span class="nx">l</span><span class="p">;</span>
<span class="nx">l</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span>
<span class="kt">string</span> <span class="nx">q</span><span class="p">;</span>
<span class="nx">q</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">r2</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of integer from W1 is ["</span> <span class="o">+</span> <span class="nx">p</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of string from W1 is ["</span> <span class="o">+</span> <span class="nx">l</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of string from W2 ["</span> <span class="o">+</span> <span class="nx">q</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="p">}</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] after fork-join:</span>
<span class="s"> Value of integer variable is ["</span> <span class="o">+</span> <span class="nx">i</span> <span class="o">+</span> <span class="s">"]</span>
<span class="s"> Value of string variable is ["</span> <span class="o">+</span> <span class="nx">s</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="kt">string</span> <span class="nx">name</span><span class="p">;</span>
<span class="kt">string</span> <span class="nx">era</span><span class="p">;</span>
<span class="nx">name</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">m</span><span class="p">[</span><span class="s">"name"</span><span class="p">];</span>
<span class="nx">era</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">m</span><span class="p">[</span><span class="s">"era"</span><span class="p">];</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] after fork-join:</span>
<span class="s"> Value of name is ["</span> <span class="o">+</span> <span class="nx">name</span> <span class="o">+</span> <span class="s">"]</span>
<span class="s"> Value of era is ["</span> <span class="o">+</span> <span class="nx">era</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="example" id="fork-join-variable-access">
<div class="col-xs-11 col-sm-11 col-md-11">
<h2><a href="./">Ballerina by Example</a>: Fork/Join Variable Access</h2>
</div>
<div class="col-xs-1 col-sm-1 col-md-1">
<a href="./" class="cBackButton"><img src="http://b.content.wso2.com/sites/all/ballerina/backbutton.svg"/></a>
</div>
<div class="col-xs-12 col-sm-12 col-md-12">
<table>
<tr>
<td class="docs">
<p>Workers within fork-join can access any variables which are declared within
the scope of that statement.
Value type variables are passed into these workers as a copy of the original
data.
Reference type variables are passed into these workers as a reference to the
original data.
Join block receives a map of any type array which contains the data sent from
the respective workers.</p>
</td>
<td class="code leading">
<div class="highlight"><pre><span class="kd">function</span> <span class="nx">main</span> <span class="p">(</span><span class="kt">string</span><span class="p">[]</span> <span class="nx">args</span><span class="p">)</span> <span class="p">{</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Define variables which are visible to the forked workers.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">int</span> <span class="nx">i</span> <span class="p">=</span> <span class="mi">100</span><span class="p">;</span>
<span class="kt">string</span> <span class="nx">s</span> <span class="p">=</span> <span class="s">"WSO2"</span><span class="p">;</span>
<span class="kt">map</span> <span class="nx">m</span> <span class="p">=</span> <span class="p">{</span><span class="s">"name"</span><span class="p">:</span><span class="s">"Abhaya"</span><span class="p">,</span> <span class="s">"era"</span><span class="p">:</span><span class="s">"Anuradhapura"</span><span class="p">};</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Declare the fork-join statement.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="k">fork</span> <span class="p">{</span>
<span class="kd">worker</span> <span class="nx">W1</span> <span class="p">{</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Change the value of the integer variable “i” within the worker W1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">i</span> <span class="p">=</span> <span class="mi">23</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Change the value of map variable “m” within the worker W1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">m</span><span class="p">[</span><span class="s">"name"</span><span class="p">]</span> <span class="p">=</span> <span class="s">"Rajasinghe"</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Define a variable within the worker to send to join block.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">string</span> <span class="nx">n</span> <span class="p">=</span> <span class="s">"Colombo"</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Send data to join block of the fork-join from worker W1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">i</span><span class="p">,</span> <span class="nx">n</span> <span class="o">-></span> <span class="k">fork</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kd">worker</span> <span class="nx">W2</span> <span class="p">{</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Change the value of string variable “s” within the worker W2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">s</span> <span class="p">=</span> <span class="s">"Ballerina"</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Change the value of map variable “m” within the worker W2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">m</span><span class="p">[</span><span class="s">"era"</span><span class="p">]</span> <span class="p">=</span> <span class="s">"Kandy"</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Send data to join block of the fork-join from worker W2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">s</span> <span class="o">-></span> <span class="k">fork</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span> <span class="k">join</span> <span class="p">(</span><span class="nx">all</span><span class="p">)</span> <span class="p">(</span><span class="kt">map</span> <span class="nx">results</span><span class="p">)</span> <span class="p">{</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Declare variables to receive the results from forked workers W1 and W2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">any</span><span class="p">[]</span> <span class="nx">r1</span><span class="p">;</span>
<span class="kt">any</span><span class="p">[]</span> <span class="nx">r2</span><span class="p">;</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>The ‘results’ map contains a map of any type array from each worker
defined within the fork-join statement.
Values received from worker W1 are assigned to any array of r1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">r1</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">any</span><span class="p">[])</span><span class="nx">results</span><span class="p">[</span><span class="s">"W1"</span><span class="p">];</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Values received from worker W2 are assigned to any array of r2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">r2</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">any</span><span class="p">[])</span><span class="nx">results</span><span class="p">[</span><span class="s">"W2"</span><span class="p">];</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Getting the 0th index of array returned from worker W1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">int</span> <span class="nx">p</span><span class="p">;</span>
<span class="nx">p</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="nx">r1</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Getting the 1th index of array returned from worker W1.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">string</span> <span class="nx">l</span><span class="p">;</span>
<span class="nx">l</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Getting the 0th index of array returned from worker W2.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="kt">string</span> <span class="nx">q</span><span class="p">;</span>
<span class="nx">q</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">r2</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Print values received from workers within join block.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of integer from W1 is ["</span> <span class="o">+</span> <span class="nx">p</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of string from W1 is ["</span> <span class="o">+</span> <span class="nx">l</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] within join:</span>
<span class="s"> Value of string from W2 ["</span> <span class="o">+</span> <span class="nx">q</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Print values after the fork-join statement to check effect on variables.
Value type variables have not been changed since they are passed in as a
copy of the original variable.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] after fork-join:</span>
<span class="s"> Value of integer variable is ["</span> <span class="o">+</span> <span class="nx">i</span> <span class="o">+</span> <span class="s">"]</span>
<span class="s"> Value of string variable is ["</span> <span class="o">+</span> <span class="nx">s</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Reference type variables are changed since they have passed in as a
reference to the workers.</p>
</td>
<td class="code">
<div class="highlight"><pre> <span class="kt">string</span> <span class="nx">name</span><span class="p">;</span>
<span class="kt">string</span> <span class="nx">era</span><span class="p">;</span>
<span class="nx">name</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">m</span><span class="p">[</span><span class="s">"name"</span><span class="p">];</span>
<span class="nx">era</span><span class="p">,</span> <span class="nx">_</span> <span class="p">=</span> <span class="p">(</span><span class="kt">string</span><span class="p">)</span><span class="nx">m</span><span class="p">[</span><span class="s">"era"</span><span class="p">];</span>
<span class="nb">println</span><span class="p">(</span><span class="s">"[default worker] after fork-join:</span>
<span class="s"> Value of name is ["</span> <span class="o">+</span> <span class="nx">name</span> <span class="o">+</span> <span class="s">"]</span>
<span class="s"> Value of era is ["</span> <span class="o">+</span> <span class="nx">era</span> <span class="o">+</span> <span class="s">"]"</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code">
<div class="highlight"><pre><span class="gp">$</span> ballerina run fork-join-variable-access.bal
<span class="go">[default worker] within join:</span>
<span class="go"> Value of integer from W1 is [23]</span>
<span class="go">[default worker] within join:</span>
<span class="go"> Value of string from W1 is [Colombo]</span>
<span class="go">[default worker] within join:</span>
<span class="go"> Value of string from W2 [Ballerina]</span>
<span class="go">[default worker] after fork-join:</span>
<span class="go"> Value of integer variable is [100]</span>
<span class="go"> Value of string variable is [WSO2]</span>
<span class="go">[default worker] after fork-join:</span>
<span class="go"> Value of name is [Rajasinghe]</span>
<span class="go"> Value of era is [Kandy]</span>
</pre></div>
</td>
</tr>
</table>
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Next example: <a href="sql-connector">SQL Connector</a>.
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