Remove StreamedFile mention (#1400)

* Remove StreamedFile mention

* add ReferenceCounted

* update callout number

* change callout

callout one line

* rename guide to micronaut-reactor-streaming-http-client

* add license

guides/micronaut-reactor-streaming-http-client/java/src/main/java/example/micronaut/HomeController.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2017-2024 original authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package example.micronaut;
+
+import io.micronaut.context.exceptions.ConfigurationException;
+import io.micronaut.core.io.buffer.ByteBuffer;
+import io.micronaut.core.io.buffer.ReferenceCounted;
+import io.micronaut.http.HttpRequest;
+import io.micronaut.http.annotation.Controller;
+import io.micronaut.http.annotation.Get;
+import io.micronaut.reactor.http.client.ReactorStreamingHttpClient;
+import jakarta.annotation.PreDestroy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Flux;
+
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+
+@Controller // <1>
+class HomeController implements AutoCloseable {
+    private static final Logger LOG = LoggerFactory.getLogger(HomeController.class);
+    private static final URI DEFAULT_URI = URI.create("https://guides.micronaut.io/micronaut5K.png");
+
+    private final ReactorStreamingHttpClient reactorStreamingHttpClient;
+
+    HomeController() {
+        String urlStr = "https://guides.micronaut.io/";
+        URL url;
+        try {
+            url = new URL(urlStr);
+        } catch (MalformedURLException e) {
+            throw new ConfigurationException("malformed URL" + urlStr);
+        }
+        this.reactorStreamingHttpClient = ReactorStreamingHttpClient.create(url); // <2>
+    }
+
+    @Get // <3>
+    Flux<ByteBuffer<?>> download() {
+        HttpRequest<?> request = HttpRequest.GET(DEFAULT_URI);
+        return reactorStreamingHttpClient.dataStream(request).doOnNext(bb -> {
+            if (bb instanceof ReferenceCounted rc) {
+                rc.retain();
+            }
+        }); // <4>
+    }
+
+    @PreDestroy // <5>
+    @Override
+    public void close() {
+        if (reactorStreamingHttpClient != null) {
+            reactorStreamingHttpClient.close();
+        }
+    }
+}

guides/micronaut-streamed-file-and-reactor-streaming-http-client/metadata.json → guides/micronaut-reactor-streaming-http-client/metadata.json

@@ -1,6 +1,6 @@
 {
   "title": "Download a big file with StreamingHttpClient",
-  "intro": "Learn how to stream responses with ReactorStreamingHttpClient, and how to use it in combination with StreamedFile.",
+  "intro": "Learn how to stream responses with ReactorStreamingHttpClient",
   "authors": ["Sergio del Amo"],
   "tags": [],
   "categories": ["Beyond the Basics"],

guides/micronaut-streamed-file-and-reactor-streaming-http-client/micronaut-streamed-file-and-reactor-streaming-http-client.adoc → guides/micronaut-reactor-streaming-http-client/micronaut-reactor-streaming-http-client.adoc

@@ -16,9 +16,8 @@ source:HomeController[]
 callout:controller[number=1,arg0=/]
 callout:reactor-streaming-http-client[2]
 callout:get-generic[3]
-callout:streamed-file[4]
-callout:streaming-http-client-data-stream[5]
-callout:predestroy[6]
+callout:streaming-http-client-data-stream[4]
+callout:predestroy[5]
 
 == Test
 

src/docs/common/callouts/callout-streaming-http-client-data-stream.adoc

@@ -1 +1 @@
-Request a stream of data where each emitted item is a `ByteBuffer` instance.
+The `dataStream` method emits instances of `ByteBuffer`. These instances are garbage  collected after each chunk is emitted. In order to propagate the chunks to the response stream they need to be retained by calling the `retain()` method. The framework will call `release()` on these garbage collected chunks once each one is written to the response.