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A simple Java client library for the awesome etcd
Uses the Apache HttpAsyncClient to implement watches without blocking a thread, and Google's Guava to give us the nice ListenableFuture interface.
Check out SmokeTest.java to see how this is used (and tested), but here's a quick code example:
EtcdClient client = new EtcdClient(URI.create("http://127.0.0.1:4001/"));
String key = "/watch";
EtcdResult result = this.client.set(key, "hello");
Assert.assertEquals("hello", result.value);
result = this.client.get(key);
Assert.assertEquals("hello", result.value);
ListenableFuture<EtcdResult> watchFuture = this.client.watch(key, result.index + 1);
Assert.assertFalse(watchFuture.isDone());
result = this.client.set(key, "world");
Assert.assertEquals("world", result.value);
EtcdResult watchResult = watchFuture.get(100, TimeUnit.MILLISECONDS);
Assert.assertNotNull(result);
Assert.assertEquals("world", result.value);For a bit of background, check out the blog post