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nats.docs/_examples/request_reply.html
2019-05-30 12:43:58 -05:00

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<div class="tab-wrap">
<input type="radio" id="request_reply_go" name="request_reply" class="tab" checked>
<label for="request_reply_go" class="api-lang" data-language="go">Go</label>
<input type="radio" id="request_reply_java" name="request_reply" class="tab">
<label for="request_reply_java" class="api-lang" data-language="java">Java</label>
<input type="radio" id="request_reply_js" name="request_reply" class="tab">
<label for="request_reply_js" class="api-lang" data-language="js">JavaScript</label>
<input type="radio" id="request_reply_py" name="request_reply" class="tab">
<label for="request_reply_py" class="api-lang" data-language="py">Python</label>
<input type="radio" id="request_reply_ruby" name="request_reply" class="tab">
<label for="request_reply_ruby" class="api-lang" data-language="ruby">Ruby</label>
<input type="radio" id="request_reply_ts" name="request_reply" class="tab">
<label for="request_reply_ts" class="api-lang" data-language="ts">TypeScript</label>
<div class="tab__content">
<pre id="request_reply_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/request_reply/main.go#L11-29"><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()
// Send the request
msg, err := nc.Request(&#34;time&#34;, nil, time.Second)
if err != nil {
log.Fatal(err)
}
// Use the response
log.Printf(&#34;Reply: %s&#34;, msg.Data)
// Close the connection
nc.Close()
</code></pre>
</div>
<div class="tab__content">
<pre id="request_reply_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/RequestReply.java#L14-25"><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;);
// Send the request
Message msg = nc.request(&#34;time&#34;, null, Duration.ofSeconds(1));
// Use the response
System.out.println(new String(msg.getData(), StandardCharsets.UTF_8));
// Close the connection
nc.close();
</code></pre>
</div>
<div class="tab__content">
<pre id="request_reply_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/publisher_samples.js#L75-80"><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.requestOne(&#39;time&#39;, (msg) =&gt; {
t.log(&#39;the time is&#39;, msg);
nc.close();
});
</code></pre>
</div>
<div class="tab__content">
<pre id="request_reply_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/request_reply.py#L8-25"><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()
async def sub(msg):
await nc.publish(msg.reply, b&#39;response&#39;)
await nc.connect(servers=[&#34;nats://demo.nats.io:4222&#34;])
await nc.subscribe(&#34;time&#34;, cb=sub)
# Send the request
try:
msg = await nc.request(&#34;time&#34;, b&#39;&#39;, timeout=1)
# Use the response
print(&#34;Reply:&#34;, msg)
except asyncio.TimeoutError:
print(&#34;Timed out waiting for response&#34;)
</code></pre>
</div>
<div class="tab__content">
<pre id="request_reply_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/request_reply.rb#L1-17"><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|
nc.subscribe(&#34;time&#34;) do |msg, reply|
nc.publish(reply, &#34;response&#34;)
end
Fiber.new do
# Use the response
msg = nc.request(&#34;time&#34;, &#34;&#34;)
puts &#34;Reply: #{msg}&#34;
end.resume
end
</code></pre>
</div>
<div class="tab__content">
<pre id="request_reply_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/publisher_samples.ts#L78-82"><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">let msg = await nc.request(&#39;time&#39;, 1000);
t.log(&#39;the time is&#39;, msg.data);
nc.close();
</code></pre>
</div>
</div>