mirror of
https://github.com/taigrr/nats.docs
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Cleaned up how examples are handled to reduce thrashing in git
Examples are no longer in the final html as solo files, only in their container file
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_examples/subscribe_json.html
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189
_examples/subscribe_json.html
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<div class="tab-wrap">
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<input type="radio" id="subscribe_json_go" name="subscribe_json" class="tab" checked>
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<label for="subscribe_json_go" class="api-lang" data-language="go">Go</label>
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<input type="radio" id="subscribe_json_java" name="subscribe_json" class="tab">
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<label for="subscribe_json_java" class="api-lang" data-language="java">Java</label>
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<input type="radio" id="subscribe_json_js" name="subscribe_json" class="tab">
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<label for="subscribe_json_js" class="api-lang" data-language="js">JavaScript</label>
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<input type="radio" id="subscribe_json_py" name="subscribe_json" class="tab">
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<label for="subscribe_json_py" class="api-lang" data-language="py">Python</label>
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<input type="radio" id="subscribe_json_ruby" name="subscribe_json" class="tab">
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<label for="subscribe_json_ruby" class="api-lang" data-language="ruby">Ruby</label>
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<input type="radio" id="subscribe_json_ts" name="subscribe_json" class="tab">
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<label for="subscribe_json_ts" class="api-lang" data-language="ts">TypeScript</label>
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<div class="tab__content">
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<pre id="subscribe_json_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/subscribe_json/main.go#L11-45"><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("demo.nats.io")
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if err != nil {
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log.Fatal(err)
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}
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defer nc.Close()
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ec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
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if err != nil {
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log.Fatal(err)
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}
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defer ec.Close()
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// Define the object
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type stock struct {
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Symbol string
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Price int
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}
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wg := sync.WaitGroup{}
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wg.Add(1)
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// Subscribe
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if _, err := ec.Subscribe("updates", func(s *stock) {
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log.Printf("Stock: %s - Price: %v", s.Symbol, s.Price)
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wg.Done()
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}); err != nil {
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log.Fatal(err)
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}
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// Wait for a message to come in
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wg.Wait()
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// Close the connection
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ec.Close()
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="subscribe_json_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/SubscribeJSON.java#L12-57"><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">class StockForJsonSub {
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public String symbol;
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public float price;
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public String toString() {
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return symbol + " is at " + price;
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}
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}
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public class SubscribeJSON {
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public static void main(String[] args) {
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try {
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Connection nc = Nats.connect("nats://demo.nats.io:4222");
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// Use a latch to wait for 10 messages to arrive
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CountDownLatch latch = new CountDownLatch(10);
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// Create a dispatcher and inline message handler
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Dispatcher d = nc.createDispatcher((msg) -> {
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Gson gson = new Gson();
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String json = new String(msg.getData(), StandardCharsets.UTF_8);
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StockForJsonSub stk = gson.fromJson(json, StockForJsonSub.class);
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// Use the object
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System.out.println(stk);
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latch.countDown();
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});
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// Subscribe
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d.subscribe("updates");
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// Wait for a message to come in
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latch.await();
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// Close the connection
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nc.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="subscribe_json_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#L76-88"><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 nc = NATS.connect({
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url: "nats://demo.nats.io:4222",
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json: true
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});
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nc.subscribe('updates', (msg) => {
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if(msg && msg.ticker === 'TSLA') {
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t.log('got message:', msg);
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}
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});
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="subscribe_json_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/subscribe_json.py#L1-23"><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">import asyncio
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import json
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from nats.aio.client import Client as NATS
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from nats.aio.errors import ErrTimeout
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async def run(loop):
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nc = NATS()
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await nc.connect(servers=["nats://127.0.0.1:4222"], loop=loop)
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async def message_handler(msg):
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data = json.loads(msg.data.decode())
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print(data)
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sid = await nc.subscribe("updates", cb=message_handler)
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await nc.flush()
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await nc.auto_unsubscribe(sid, 2)
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await nc.publish("updates", json.dumps({"symbol": "GOOG", "price": 1200 }).encode())
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await asyncio.sleep(1, loop=loop)
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await nc.close()
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="subscribe_json_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/subscribe_json.rb#L1-13"><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 'nats/client'
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require 'json'
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NATS.start(servers:["nats://127.0.0.1:4222"]) do |nc|
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nc.subscribe("updates") do |msg|
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m = JSON.parse(msg)
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# {"symbol"=>"GOOG", "price"=>12}
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p m
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end
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end
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</code></pre>
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</div>
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<div class="tab__content">
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<pre id="subscribe_json_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#L70-80"><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">let nc = await connect({
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url: "nats://demo.nats.io:4222",
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payload: Payload.JSON
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});
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nc.subscribe('updates', (err, msg) => {
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t.log('got message:', msg.data ? msg.data : "no payload");
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});
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</code></pre>
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</div>
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</div>
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