Implement Eclipse Jetty core HTTP handler adapter

framework-platform/framework-platform.gradle

@@ -16,8 +16,8 @@ dependencies {
 	api(platform("org.apache.groovy:groovy-bom:4.0.21"))
 	api(platform("org.apache.logging.log4j:log4j-bom:2.21.1"))
 	api(platform("org.assertj:assertj-bom:3.26.0"))
-	api(platform("org.eclipse.jetty:jetty-bom:12.0.10"))
-	api(platform("org.eclipse.jetty.ee10:jetty-ee10-bom:12.0.10"))
+	api(platform("org.eclipse.jetty:jetty-bom:12.0.11"))
+	api(platform("org.eclipse.jetty.ee10:jetty-ee10-bom:12.0.11"))
 	api(platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.7.3"))
 	api(platform("org.jetbrains.kotlinx:kotlinx-serialization-bom:1.6.0"))
 	api(platform("org.junit:junit-bom:5.10.2"))

spring-core/spring-core.gradle

@@ -81,6 +81,7 @@ dependencies {
 	optional("io.smallrye.reactive:mutiny")
 	optional("net.sf.jopt-simple:jopt-simple")
 	optional("org.aspectj:aspectjweaver")
+	optional("org.eclipse.jetty:jetty-io")
 	optional("org.jetbrains.kotlin:kotlin-reflect")
 	optional("org.jetbrains.kotlin:kotlin-stdlib")
 	optional("org.jetbrains.kotlinx:kotlinx-coroutines-core")

spring-core/src/main/java/org/springframework/core/io/buffer/DefaultDataBuffer.java

@@ -355,7 +355,7 @@ public DefaultDataBuffer slice(int index, int length) {
 	}
 
 	@Override
-	public DataBuffer split(int index) {
+	public DefaultDataBuffer split(int index) {
 		checkIndex(index);
 
 		ByteBuffer split = this.byteBuffer.duplicate().clear()

spring-core/src/main/java/org/springframework/core/io/buffer/JettyDataBuffer.java

@@ -0,0 +1,359 @@
+/*
+ * Copyright 2002-2024 the original author or 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 org.springframework.core.io.buffer;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.IntPredicate;
+
+import org.eclipse.jetty.io.Content;
+
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+
+/**
+ * Implementation of the {@code DataBuffer} interface that can wrap a Jetty
+ * {@link Content.Chunk}. Typically constructed with {@link JettyDataBufferFactory}.
+ *
+ * @author Greg Wilkins
+ * @author Lachlan Roberts
+ * @author Arjen Poutsma
+ * @since 6.2
+ */
+public final class JettyDataBuffer implements PooledDataBuffer {
+
+	private final DefaultDataBuffer delegate;
+
+	@Nullable
+	private final Content.Chunk chunk;
+
+	private final JettyDataBufferFactory bufferFactory;
+
+	private final AtomicInteger refCount = new AtomicInteger(1);
+
+
+	JettyDataBuffer(JettyDataBufferFactory bufferFactory, DefaultDataBuffer delegate, Content.Chunk chunk) {
+		Assert.notNull(bufferFactory, "BufferFactory must not be null");
+		Assert.notNull(delegate, "Delegate must not be null");
+		Assert.notNull(chunk, "Chunk must not be null");
+
+		this.bufferFactory = bufferFactory;
+		this.delegate = delegate;
+		this.chunk = chunk;
+		this.chunk.retain();
+	}
+
+	JettyDataBuffer(JettyDataBufferFactory bufferFactory, DefaultDataBuffer delegate) {
+		Assert.notNull(bufferFactory, "BufferFactory must not be null");
+		Assert.notNull(delegate, "Delegate must not be null");
+
+		this.bufferFactory = bufferFactory;
+		this.delegate = delegate;
+		this.chunk = null;
+	}
+
+	@Override
+	public boolean isAllocated() {
+		return this.refCount.get() > 0;
+	}
+
+	@Override
+	public PooledDataBuffer retain() {
+		int result = this.refCount.updateAndGet(c -> {
+			if (c != 0) {
+				return c + 1;
+			}
+			else {
+				return 0;
+			}
+		});
+		if (result != 0 && this.chunk != null) {
+			this.chunk.retain();
+		}
+		return this;
+	}
+
+	@Override
+	public PooledDataBuffer touch(Object hint) {
+		return this;
+	}
+
+	@Override
+	public boolean release() {
+		int result = this.refCount.updateAndGet(c -> {
+			if (c != 0) {
+				return c - 1;
+			}
+			else {
+				throw new IllegalStateException("JettyDataBuffer already released: " + this);
+			}
+		});
+		if (this.chunk != null) {
+			return this.chunk.release();
+		}
+		else {
+			return result == 0;
+		}
+	}
+
+	@Override
+	public DataBufferFactory factory() {
+		return this.bufferFactory;
+	}
+
+	// delegation
+
+	@Override
+	public int indexOf(IntPredicate predicate, int fromIndex) {
+		return this.delegate.indexOf(predicate, fromIndex);
+	}
+
+	@Override
+	public int lastIndexOf(IntPredicate predicate, int fromIndex) {
+		return this.delegate.lastIndexOf(predicate, fromIndex);
+	}
+
+	@Override
+	public int readableByteCount() {
+		return this.delegate.readableByteCount();
+	}
+
+	@Override
+	public int writableByteCount() {
+		return this.delegate.writableByteCount();
+	}
+
+	@Override
+	public int capacity() {
+		return this.delegate.capacity();
+	}
+
+	@Override
+	@Deprecated
+	public DataBuffer capacity(int capacity) {
+		this.delegate.capacity(capacity);
+		return this;
+	}
+
+	@Override
+	public DataBuffer ensureWritable(int capacity) {
+		this.delegate.ensureWritable(capacity);
+		return this;
+	}
+
+	@Override
+	public int readPosition() {
+		return this.delegate.readPosition();
+	}
+
+	@Override
+	public DataBuffer readPosition(int readPosition) {
+		this.delegate.readPosition(readPosition);
+		return this;
+	}
+
+	@Override
+	public int writePosition() {
+		return this.delegate.writePosition();
+	}
+
+	@Override
+	public DataBuffer writePosition(int writePosition) {
+		this.delegate.writePosition(writePosition);
+		return this;
+	}
+
+	@Override
+	public byte getByte(int index) {
+		return this.delegate.getByte(index);
+	}
+
+	@Override
+	public byte read() {
+		return this.delegate.read();
+	}
+
+	@Override
+	public DataBuffer read(byte[] destination) {
+		this.delegate.read(destination);
+		return this;
+	}
+
+	@Override
+	public DataBuffer read(byte[] destination, int offset, int length) {
+		this.delegate.read(destination, offset, length);
+		return this;
+	}
+
+	@Override
+	public DataBuffer write(byte b) {
+		this.delegate.write(b);
+		return this;
+	}
+
+	@Override
+	public DataBuffer write(byte[] source) {
+		this.delegate.write(source);
+		return this;
+	}
+
+	@Override
+	public DataBuffer write(byte[] source, int offset, int length) {
+		this.delegate.write(source, offset, length);
+		return this;
+	}
+
+	@Override
+	public DataBuffer write(DataBuffer... buffers) {
+		this.delegate.write(buffers);
+		return this;
+	}
+
+	@Override
+	public DataBuffer write(ByteBuffer... buffers) {
+		this.delegate.write(buffers);
+		return this;
+	}
+
+	@Override
+	@Deprecated
+	public DataBuffer slice(int index, int length) {
+		DefaultDataBuffer delegateSlice = this.delegate.slice(index, length);
+		if (this.chunk != null) {
+			this.chunk.retain();
+			return new JettyDataBuffer(this.bufferFactory, delegateSlice, this.chunk);
+		}
+		else {
+			return new JettyDataBuffer(this.bufferFactory, delegateSlice);
+		}
+	}
+
+	@Override
+	public DataBuffer split(int index) {
+		DefaultDataBuffer delegateSplit = this.delegate.split(index);
+		if (this.chunk != null) {
+			this.chunk.retain();
+			return new JettyDataBuffer(this.bufferFactory, delegateSplit, this.chunk);
+		}
+		else {
+			return new JettyDataBuffer(this.bufferFactory, delegateSplit);
+		}
+	}
+
+	@Override
+	@Deprecated
+	public ByteBuffer asByteBuffer() {
+		return this.delegate.asByteBuffer();
+	}
+
+	@Override
+	@Deprecated
+	public ByteBuffer asByteBuffer(int index, int length) {
+		return this.delegate.asByteBuffer(index, length);
+	}
+
+	@Override
+	@Deprecated
+	public ByteBuffer toByteBuffer(int index, int length) {
+		return this.delegate.toByteBuffer(index, length);
+	}
+
+	@Override
+	public void toByteBuffer(int srcPos, ByteBuffer dest, int destPos, int length) {
+		this.delegate.toByteBuffer(srcPos, dest, destPos, length);
+	}
+
+	@Override
+	public ByteBufferIterator readableByteBuffers() {
+		ByteBufferIterator delegateIterator = this.delegate.readableByteBuffers();
+		if (this.chunk != null) {
+			return new JettyByteBufferIterator(delegateIterator, this.chunk);
+		}
+		else {
+			return delegateIterator;
+		}
+	}
+
+	@Override
+	public ByteBufferIterator writableByteBuffers() {
+		ByteBufferIterator delegateIterator = this.delegate.writableByteBuffers();
+		if (this.chunk != null) {
+			return new JettyByteBufferIterator(delegateIterator, this.chunk);
+		}
+		else {
+			return delegateIterator;
+		}
+	}
+
+	@Override
+	public String toString(int index, int length, Charset charset) {
+		return this.delegate.toString(index, length, charset);
+	}
+
+	@Override
+	public int hashCode() {
+		return this.delegate.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		return this == o || (o instanceof JettyDataBuffer other &&
+				this.delegate.equals(other.delegate));
+	}
+
+	@Override
+	public String toString() {
+		return String.format("JettyDataBuffer (r: %d, w: %d, c: %d)",
+				readPosition(), writePosition(), capacity());
+	}
+
+	private static final class JettyByteBufferIterator implements ByteBufferIterator {
+
+		private final ByteBufferIterator delegate;
+
+		private final Content.Chunk chunk;
+
+
+		public JettyByteBufferIterator(ByteBufferIterator delegate, Content.Chunk chunk) {
+			Assert.notNull(delegate, "Delegate must not be null");
+			Assert.notNull(chunk, "Chunk must not be null");
+
+			this.delegate = delegate;
+			this.chunk = chunk;
+			this.chunk.retain();
+		}
+
+
+		@Override
+		public void close() {
+			this.delegate.close();
+			this.chunk.release();
+		}
+
+		@Override
+		public boolean hasNext() {
+			return this.delegate.hasNext();
+		}
+
+		@Override
+		public ByteBuffer next() {
+			return this.delegate.next();
+		}
+	}
+
+}