[fit] optimize connections of netty http server

framework/fit/java/fit-builtin/plugins/fit-http-server-netty/src/main/java/modelengine/fit/http/server/netty/NettyHttpServerRequest.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.server.netty;
 
@@ -71,7 +71,7 @@ public NettyHttpServerRequest(HttpRequest request, ChannelHandlerContext ctx, bo
         this.startLine = this.initStartLine();
         this.headers = this.initHeaders();
         this.body = this.isLargeBody() ? NettyReadableMessageBody.large() : NettyReadableMessageBody.common();
-        log.info("Netty http request initialized. [id={0}, request={1}]", ctx.name(), this.startLine());
+        log.debug("Netty http request initialized. [id={0}, request={1}]", ctx.name(), this.startLine());
     }
 
     private boolean isLargeBody() {
@@ -197,7 +197,7 @@ public void close() throws IOException {
             if (this.isClosed.get()) {
                 return;
             }
-            log.info("Netty http request closed. [id={}]", this.ctx.name());
+            log.debug("Netty http request closed. [id={}]", this.ctx.name());
             this.isClosed.set(true);
             this.body.close();
         } finally {

framework/fit/java/fit-builtin/plugins/fit-http-server-netty/src/main/java/modelengine/fit/http/server/netty/NettyHttpServerResponse.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.server.netty;
 
@@ -126,6 +126,11 @@ public boolean isActive() {
         return this.ctx.channel().isActive();
     }
 
+    @Override
+    public void closeChannel() {
+        this.ctx.close();
+    }
+
     @Override
     public void close() throws IOException {
         this.isClosed = true;

framework/fit/java/fit-builtin/services/fit-http-classic/definition/src/main/java/modelengine/fit/http/entity/support/DefaultTextEvent.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.entity.support;
 
@@ -88,7 +88,7 @@ private static void appendComment(StringBuilder sb, String comment) {
 
     private static void appendData(StringBuilder sb, ObjectSerializer objectSerializer, Object data) {
         if (data == null) {
-            if (sb.length() == 0) {
+            if (sb.isEmpty()) {
                 sb.append(LF);
             }
             sb.append(LF);

framework/fit/java/fit-builtin/services/fit-http-classic/definition/src/main/java/modelengine/fit/http/server/support/DefaultHttpClassicServerResponse.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.server.support;
 
@@ -22,6 +22,7 @@
 import modelengine.fit.http.entity.Entity;
 import modelengine.fit.http.entity.FileEntity;
 import modelengine.fit.http.entity.ReadableBinaryEntity;
+import modelengine.fit.http.entity.TextEvent;
 import modelengine.fit.http.entity.TextEventStreamEntity;
 import modelengine.fit.http.entity.WritableBinaryEntity;
 import modelengine.fit.http.entity.support.DefaultWritableBinaryEntity;
@@ -36,6 +37,7 @@
 import modelengine.fit.http.server.HttpClassicServerResponse;
 import modelengine.fit.http.server.InternalServerErrorException;
 import modelengine.fit.http.support.AbstractHttpClassicResponse;
+import modelengine.fitframework.flowable.Subscription;
 import modelengine.fitframework.resource.UrlUtils;
 import modelengine.fitframework.serialization.ObjectSerializer;
 import modelengine.fitframework.util.ObjectUtils;
@@ -45,8 +47,6 @@
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.Optional;
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * 表示 {@link HttpClassicServerResponse} 的默认实现。
@@ -148,78 +148,106 @@ public void send() {
             if (this.entity == null) {
                 this.headers().set(CONTENT_LENGTH, ZERO);
                 this.serverResponse.writeStartLineAndHeaders();
-            } else if (this.entity instanceof ReadableBinaryEntity) {
-                if (this.entity instanceof FileEntity) {
-                    FileEntity actual = cast(this.entity);
-                    this.headers().set(CONTENT_LENGTH, String.valueOf(actual.length()));
-                } else if (!this.headers().contains(CONTENT_LENGTH)) {
-                    this.headers().set(TRANSFER_ENCODING, CHUNKED);
-                }
-                this.serverResponse.writeStartLineAndHeaders();
-                ReadableBinaryEntity readableBinaryEntity = cast(this.entity);
-                byte[] bytes = new byte[512];
-                int read;
-                while ((read = readableBinaryEntity.read(bytes)) > -1) {
-                    this.serverResponse.writeBody(bytes, 0, read);
-                }
-            } else if (this.entity instanceof WritableBinaryEntity) {
-                // WritableBinaryEntity 已经在用户代码层面进行了输出，因此此处什么都不需要处理。
+                this.serverResponse.flush();
             } else if (this.entity instanceof TextEventStreamEntity) {
                 this.headers().set(CACHE_CONTROL, NO_CACHE);
                 this.headers().set(CONNECTION, KEEP_ALIVE);
                 this.headers().set(TRANSFER_ENCODING, CHUNKED);
                 this.serverResponse.writeStartLineAndHeaders();
-                this.sendTextEventStream(cast(this.entity));
+                this.sendTextEventStream(cast(this.entity), charset);
             } else {
-                byte[] entityBytes = this.entitySerializer().serializeEntity(ObjectUtils.cast(this.entity), charset);
-                this.headers().set(CONTENT_LENGTH, String.valueOf(entityBytes.length));
-                this.serverResponse.writeStartLineAndHeaders();
-                this.serverResponse.writeBody(entityBytes);
+                this.sendDirectly(charset);
             }
-            this.serverResponse.flush();
         } catch (IOException e) {
             throw new InternalServerErrorException("Failed to write response.", e);
         }
     }
 
-    @Override
-    public boolean isActive() {
-        return this.serverResponse.isActive();
-    }
-
-    private void sendTextEventStream(TextEventStreamEntity eventStreamEntity) throws IOException {
+    private void sendTextEventStream(TextEventStreamEntity eventStreamEntity, Charset charset) throws IOException {
         ObjectSerializer objectSerializer = this.jsonSerializer()
                 .orElseThrow(() -> new IllegalStateException("The json serializer cannot be null."));
-        AtomicReference<Exception> exception = new AtomicReference<>();
-        CountDownLatch latch = new CountDownLatch(1);
         eventStreamEntity.stream()
-                .map(sse -> sse.serialize(objectSerializer).getBytes(StandardCharsets.UTF_8))
-                .subscribe(null, (subscription, bytes) -> {
-                    try {
-                        this.serverResponse.writeBody(bytes);
-                    } catch (IOException e) {
-                        subscription.cancel();
-                        exception.set(e);
-                        latch.countDown();
-                    }
-                }, subscription -> latch.countDown(), (ignore, e) -> {
-                    exception.set(e);
-                    latch.countDown();
-                });
+                .map(event -> event.serialize(objectSerializer).getBytes(charset))
+                .subscribe(null,
+                        (subscription, bytes) -> this.onSseMessage(subscription, bytes, charset),
+                        subscription -> this.onSseComplete(charset),
+                        (subscription, e) -> this.onSseError(e, charset));
+    }
+
+    private void onSseMessage(Subscription subscription, byte[] bytes, Charset charset) {
         try {
-            latch.await();
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-            throw new InternalServerErrorException("Failed to execute handler.", e);
+            this.serverResponse.writeBody(bytes);
+        } catch (IOException e) {
+            subscription.cancel();
+            this.onSseError(e, charset);
         }
-        Exception e = exception.get();
-        if (e == null) {
-            return;
+    }
+
+    private void onSseComplete(Charset charset) {
+        try {
+            this.serverResponse.flush();
+        } catch (IOException e) {
+            this.onSseError(e, charset);
+        } finally {
+            try {
+                this.close0();
+            } catch (IOException e) {
+                // ignore.
+            }
+        }
+    }
+
+    private void onSseError(Throwable throwable, Charset charset) {
+        try {
+            TextEvent errorEvent = TextEvent.custom().event("error").data(throwable.getMessage()).build();
+            ObjectSerializer objectSerializer = this.jsonSerializer()
+                    .orElseThrow(() -> new IllegalStateException("The json serializer cannot be null."));
+            this.serverResponse.writeBody(errorEvent.serialize(objectSerializer).getBytes(charset));
+            this.serverResponse.flush();
+        } catch (IOException e) {
+            this.serverResponse.closeChannel();
+            InternalServerErrorException internalServerErrorException =
+                    new InternalServerErrorException("Failed to send error response when sse.", e);
+            internalServerErrorException.addSuppressed(throwable);
+            throw internalServerErrorException;
+        } finally {
+            try {
+                this.close0();
+            } catch (IOException e) {
+                // ignore.
+            }
         }
-        if (e instanceof IOException) {
-            throw (IOException) e;
+    }
+
+    private void sendDirectly(Charset charset) throws IOException {
+        if (this.entity instanceof ReadableBinaryEntity) {
+            if (this.entity instanceof FileEntity) {
+                FileEntity actual = cast(this.entity);
+                this.headers().set(CONTENT_LENGTH, String.valueOf(actual.length()));
+            } else if (!this.headers().contains(CONTENT_LENGTH)) {
+                this.headers().set(TRANSFER_ENCODING, CHUNKED);
+            }
+            this.serverResponse.writeStartLineAndHeaders();
+            ReadableBinaryEntity readableBinaryEntity = cast(this.entity);
+            byte[] bytes = new byte[512];
+            int read;
+            while ((read = readableBinaryEntity.read(bytes)) > -1) {
+                this.serverResponse.writeBody(bytes, 0, read);
+            }
+        } else if (this.entity instanceof WritableBinaryEntity) {
+            // WritableBinaryEntity 已经在用户代码层面进行了输出，因此此处什么都不需要处理。
+        } else {
+            byte[] entityBytes = this.entitySerializer().serializeEntity(ObjectUtils.cast(this.entity), charset);
+            this.headers().set(CONTENT_LENGTH, String.valueOf(entityBytes.length));
+            this.serverResponse.writeStartLineAndHeaders();
+            this.serverResponse.writeBody(entityBytes);
         }
-        throw new InternalServerErrorException("Failed to execute handler.", e);
+        this.serverResponse.flush();
+    }
+
+    @Override
+    public boolean isActive() {
+        return this.serverResponse.isActive();
     }
 
     @Override
@@ -239,6 +267,13 @@ protected void commit() {
 
     @Override
     public void close() throws IOException {
+        if (this.entity instanceof TextEventStreamEntity) {
+            return;
+        }
+        this.close0();
+    }
+
+    private void close0() throws IOException {
         this.serverResponse.close();
         if (this.entity != null) {
             this.entity.close();

framework/fit/java/fit-builtin/services/fit-http-classic/definition/src/test/java/modelengine/fit/http/server/support/DefaultHttpClassicServerResponseTest.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.server.support;
 
@@ -99,7 +99,7 @@ void shouldThrowExceptionWhenSendTextStreamError() throws IOException {
         ServerResponse serverResponse = mock(ServerResponse.class);
         when(serverResponse.startLine()).thenReturn(mock(ConfigurableStatusLine.class));
         when(serverResponse.headers()).thenReturn(mock(ConfigurableMessageHeaders.class));
-        doThrow(new IOException("Error")).when(serverResponse).writeBody(new byte[1]);
+        doThrow(new IOException("Error")).when(serverResponse).flush();
         Choir<byte[]> mappedChoir = Choir.just(new byte[1], new byte[2]);
         Choir<TextEvent> stream = ObjectUtils.cast(mock(Choir.class));
         when(stream.map(Mockito.any())).thenReturn(ObjectUtils.cast(mappedChoir));

framework/fit/java/fit-builtin/services/fit-http-protocol/definition/src/main/java/modelengine/fit/http/protocol/ServerResponse.java

@@ -1,8 +1,8 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) 2024 Huawei Technologies Co., Ltd. All rights reserved.
- *  This file is a part of the ModelEngine Project.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
+/*
+ * Copyright (c) 2024-2025 Huawei Technologies Co., Ltd. All rights reserved.
+ * This file is a part of the ModelEngine Project.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
 
 package modelengine.fit.http.protocol;
 
@@ -82,4 +82,9 @@ default void writeBody(byte[] bytes) throws IOException {
      * @return true if the response is active; false otherwise.
      */
     boolean isActive();
+
+    /**
+     * Closes the underlying channel associated with the response.
+     */
+    void closeChannel();
 }