java nats RequestMany

nats js sdk 很早就支持RequestMany的特性，java 版实际是不支持的，但是nats 的背后公司基于jnats 包装了orbit.java 实现了类似功能

参考玩法

• 依赖

 <dependency>
            <groupId>io.synadia</groupId>
            <artifactId>request-many</artifactId>
            <version>0.1.1</version>
 </dependency>

• 使用

Options options = new Options.Builder()
                .server("nats://localhost:4222")
                .inboxPrefix("_inbox.dalong")
                .build();

        try (Connection nc = Nats.connect(options)) {

            // Use the standard sentinel builder shortcut
            RequestMany rm = RequestMany.standardSentinel(nc);
            System.out.println(rm);

            // start a responder simulator.
            Dispatcher dispatcher = nc.createDispatcher(m -> {
                for (int x = 0; x < 10; x++) {
                    System.out.println(m.getReplyTo());
                    nc.publish(m.getReplyTo(), ("R" + x + "-" + new String(m.getData())).getBytes());
                }
                nc.publish(m.getReplyTo(), null);
            });
            dispatcher.subscribe("dalong");
            rm.request("dalong", "hello".getBytes(), (message) -> {
                System.out.println("Received: " + new String(message.toString()));
                return true;
                //  return list.add(message);
            });

        }

说明

以上是简单说明（callback 模式），实际还支持其他模式的（max requests，timeout 等）

参考资料

https://github.com/synadia-io/orbit.java/tree/main/request-many

https://github.com/synadia-ai/synadia-agents/tree/main/client-sdk

https://github.com/nats-io/nats.js/blob/main/core/src/nats.ts#L190