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Alberto Ricart
2019-05-15 14:12:30 -05:00
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<div class="tab-wrap">
<input type="radio" id="subscribe_queue_go" name="subscribe_queue" class="tab" checked>
<label for="subscribe_queue_go" class="api-lang" data-language="go">Go</label>
<input type="radio" id="subscribe_queue_java" name="subscribe_queue" class="tab">
<label for="subscribe_queue_java" class="api-lang" data-language="java">Java</label>
<input type="radio" id="subscribe_queue_js" name="subscribe_queue" class="tab">
<label for="subscribe_queue_js" class="api-lang" data-language="js">JavaScript</label>
<input type="radio" id="subscribe_queue_py" name="subscribe_queue" class="tab">
<label for="subscribe_queue_py" class="api-lang" data-language="py">Python</label>
<input type="radio" id="subscribe_queue_ruby" name="subscribe_queue" class="tab">
<label for="subscribe_queue_ruby" class="api-lang" data-language="ruby">Ruby</label>
<input type="radio" id="subscribe_queue_ts" name="subscribe_queue" class="tab">
<label for="subscribe_queue_ts" class="api-lang" data-language="ts">TypeScript</label>
<div class="tab__content">
<pre id="subscribe_queue_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/subscribe_queue/main.go#L11-34"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go">nc, err := nats.Connect(&#34;demo.nats.io&#34;)
if err != nil {
log.Fatal(err)
}
defer nc.Close()
// Use a WaitGroup to wait for 10 messages to arrive
wg := sync.WaitGroup{}
wg.Add(10)
// Create a queue subscription on &#34;updates&#34; with queue name &#34;workers&#34;
if _, err := nc.QueueSubscribe(&#34;updates&#34;, &#34;worker&#34;, func(m *nats.Msg) {
wg.Done()
}); err != nil {
log.Fatal(err)
}
// Wait for messages to come in
wg.Wait()
// Close the connection
nc.Close()
</code></pre>
</div>
<div class="tab__content">
<pre id="subscribe_queue_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/SubscribeQueue.java#L14-35"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java">Connection nc = Nats.connect(&#34;nats://demo.nats.io:4222&#34;);
// Use a latch to wait for 10 messages to arrive
CountDownLatch latch = new CountDownLatch(10);
// Create a dispatcher and inline message handler
Dispatcher d = nc.createDispatcher((msg) -&gt; {
String str = new String(msg.getData(), StandardCharsets.UTF_8);
System.out.println(str);
latch.countDown();
});
// Subscribe
d.subscribe(&#34;updates&#34;, &#34;workers&#34;);
// Wait for a message to come in
latch.await();
// Close the connection
nc.close();
</code></pre>
</div>
<div class="tab__content">
<pre id="subscribe_queue_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/subscriber_samples.js#L217-221"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript">nc.subscribe(&#39;updates&#39;, {queue: &#34;workers&#34;}, (msg) =&gt; {
t.log(&#39;worker got message&#39;, msg);
});
</code></pre>
</div>
<div class="tab__content">
<pre id="subscribe_queue_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/subscribe_queue.py#L6-23"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">nc = NATS()
await nc.connect(servers=[&#34;nats://demo.nats.io:4222&#34;])
future = asyncio.Future()
async def cb(msg):
nonlocal future
future.set_result(msg)
await nc.subscribe(&#34;updates&#34;, queue=&#34;workers&#34;, cb=cb)
await nc.publish(&#34;updates&#34;, b&#39;All is Well&#39;)
msg = await asyncio.wait_for(future, 1)
print(&#34;Msg&#34;, msg)
</code></pre>
</div>
<div class="tab__content">
<pre id="subscribe_queue_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/subscribe_queue.rb#L1-21"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby">require &#39;nats/client&#39;
require &#39;fiber&#39;
NATS.start(servers:[&#34;nats://127.0.0.1:4222&#34;]) do |nc|
Fiber.new do
f = Fiber.current
nc.subscribe(&#34;updates&#34;, queue: &#34;worker&#34;) do |msg, reply|
f.resume Time.now
end
nc.publish(&#34;updates&#34;, &#34;A&#34;)
# Use the response
msg = Fiber.yield
puts &#34;Msg: #{msg}&#34;
end.resume
end
</code></pre>
</div>
<div class="tab__content">
<pre id="subscribe_queue_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/subscriber_samples.ts#L193-197"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript">await nc.subscribe(&#39;updates&#39;, (err, msg) =&gt; {
t.log(&#39;worker got message&#39;, msg.data);
}, {queue: &#34;workers&#34;});
</code></pre>
</div>
</div>