Support Undertow 1.3.0 in UndertowXhrTransport

As of Undertow 1.3.0, several APIs have been changed: replacing Xnio's
Pool/Pooled references to Undertow's new ByteBufferPool abstraction.
This move has been made, as part of
https://issues.jboss.org/browse/UNDERTOW-522, to prepare deprecations in
the Xnio API.

This commit adds a new strategy to deal with both 1.0-1.2 and 1.3
Undertow generations.

Issue: SPR-13366

build.gradle

@@ -72,7 +72,7 @@ configure(allprojects) { project ->
 	ext.tiles3Version        = "3.0.5"
 	ext.tomcatVersion        = "8.0.26"
 	ext.tyrusVersion         = "1.3.5"  // constrained by WebLogic 12.1.3 support
-	ext.undertowVersion      = "1.2.12.Final"
+	ext.undertowVersion      = "1.3.0.CR2"
 	ext.woodstoxVersion      = "5.0.1"
 	ext.xmlunitVersion       = "1.6"
 	ext.xstreamVersion       = "1.4.8"

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/UndertowXhrTransport.java

@@ -18,6 +18,7 @@ package org.springframework.web.socket.sockjs.client;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.lang.reflect.Method;
 import java.net.URI;
 import java.nio.ByteBuffer;
 import java.util.List;
@@ -30,6 +31,9 @@ import io.undertow.client.ClientExchange;
 import io.undertow.client.ClientRequest;
 import io.undertow.client.ClientResponse;
 import io.undertow.client.UndertowClient;
+import io.undertow.connector.ByteBufferPool;
+import io.undertow.connector.PooledByteBuffer;
+import io.undertow.server.DefaultByteBufferPool;
 import io.undertow.util.AttachmentKey;
 import io.undertow.util.HeaderMap;
 import io.undertow.util.HttpString;
@@ -37,9 +41,11 @@ import io.undertow.util.Methods;
 import io.undertow.util.StringReadChannelListener;
 import org.xnio.ChannelListener;
 import org.xnio.ChannelListeners;
+import org.xnio.IoFuture;
 import org.xnio.IoUtils;
 import org.xnio.OptionMap;
 import org.xnio.Options;
+import org.xnio.Pool;
 import org.xnio.Xnio;
 import org.xnio.XnioWorker;
 import org.xnio.channels.StreamSinkChannel;
@@ -49,6 +55,8 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.concurrent.SettableListenableFuture;
 import org.springframework.web.client.HttpServerErrorException;
 import org.springframework.web.socket.CloseStatus;
@@ -61,7 +69,7 @@ import org.springframework.web.socket.sockjs.frame.SockJsFrame;
 
 /**
  * An XHR transport based on Undertow's {@link io.undertow.client.UndertowClient}.
- * Compatible with Undertow 1.0, 1.1, 1.2.
+ * Compatible with Undertow from version 1.0 to 1.3.
  *
  * <p>When used for testing purposes (e.g. load testing) or for specific use cases
  * (like HTTPS configuration), a custom OptionMap should be provided:
@@ -84,6 +92,9 @@ import org.springframework.web.socket.sockjs.frame.SockJsFrame;
  */
 public class UndertowXhrTransport extends AbstractXhrTransport {
 
+	private static final boolean undertow13Present = ClassUtils.isPresent("io.undertow.connector.ByteBufferPool",
+			UndertowXhrTransport.class.getClassLoader());
+
 	private static final AttachmentKey<String> RESPONSE_BODY = AttachmentKey.create(String.class);
 
 
@@ -93,21 +104,24 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 
 	private final XnioWorker worker;
 
-	@SuppressWarnings("deprecation")
-	private final org.xnio.Pool<ByteBuffer> bufferPool;
+	private final UndertowBufferSupport undertowBufferSupport;
 
 
 	public UndertowXhrTransport() throws IOException {
 		this(OptionMap.builder().parse(Options.WORKER_NAME, "SockJSClient").getMap());
 	}
 
-	@SuppressWarnings("deprecation")
 	public UndertowXhrTransport(OptionMap optionMap) throws IOException {
 		Assert.notNull(optionMap, "OptionMap is required");
 		this.optionMap = optionMap;
 		this.httpClient = UndertowClient.getInstance();
 		this.worker = Xnio.getInstance().createWorker(optionMap);
-		this.bufferPool = new org.xnio.ByteBufferSlicePool(1048, 1048);
+		if (undertow13Present) {
+			this.undertowBufferSupport = new Undertow13BufferSupport();
+		}
+		else {
+			this.undertowBufferSupport = new Undertow10BufferSupport();
+		}
 	}
 
 
@@ -144,24 +158,25 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 			logger.trace("Starting XHR receive request for " + url);
 		}
 
-		this.httpClient.connect(
-				new ClientCallback<ClientConnection>() {
-					@Override
-					public void completed(ClientConnection connection) {
-						ClientRequest request = new ClientRequest().setMethod(Methods.POST).setPath(url.getPath());
-						HttpString headerName = HttpString.tryFromString(HttpHeaders.HOST);
-						request.getRequestHeaders().add(headerName, url.getHost());
-						addHttpHeaders(request, headers);
-						HttpHeaders httpHeaders = transportRequest.getHttpRequestHeaders();
-						connection.sendRequest(request, createReceiveCallback(transportRequest,
-								url, httpHeaders, session, connectFuture));
-					}
-					@Override
-					public void failed(IOException ex) {
-						throw new SockJsTransportFailureException("Failed to execute request to " + url, ex);
-					}
-				},
-				url, this.worker, this.bufferPool, this.optionMap);
+		ClientCallback<ClientConnection> clientCallback = new ClientCallback<ClientConnection>() {
+			@Override
+			public void completed(ClientConnection connection) {
+				ClientRequest request = new ClientRequest().setMethod(Methods.POST).setPath(url.getPath());
+				HttpString headerName = HttpString.tryFromString(HttpHeaders.HOST);
+				request.getRequestHeaders().add(headerName, url.getHost());
+				addHttpHeaders(request, headers);
+				HttpHeaders httpHeaders = transportRequest.getHttpRequestHeaders();
+				connection.sendRequest(request, createReceiveCallback(transportRequest,
+						url, httpHeaders, session, connectFuture));
+			}
+
+			@Override
+			public void failed(IOException ex) {
+				throw new SockJsTransportFailureException("Failed to execute request to " + url, ex);
+			}
+		};
+
+		this.undertowBufferSupport.httpClientConnect(this.httpClient, clientCallback, url, worker, this.optionMap);
 	}
 
 	private static void addHttpHeaders(ClientRequest request, HttpHeaders headers) {
@@ -211,6 +226,7 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 							onFailure(exc);
 						}
 					}
+
 					@Override
 					public void failed(IOException exc) {
 						IoUtils.safeClose(exchange.getConnection());
@@ -264,8 +280,8 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 		List<ClientResponse> responses = new CopyOnWriteArrayList<ClientResponse>();
 
 		try {
-			ClientConnection connection = this.httpClient.connect(url, this.worker,
-					this.bufferPool, this.optionMap).get();
+			ClientConnection connection = this.undertowBufferSupport
+					.httpClientConnect(this.httpClient, url, this.worker, this.optionMap).get();
 			try {
 				ClientRequest request = new ClientRequest().setMethod(method).setPath(url.getPath());
 				request.getRequestHeaders().add(HttpString.tryFromString(HttpHeaders.HOST), url.getHost());
@@ -314,12 +330,14 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 								result.getResponse().putAttachment(RESPONSE_BODY, string);
 								latch.countDown();
 							}
+
 							@Override
 							protected void error(IOException ex) {
 								onFailure(latch, ex);
 							}
 						}.setup(result.getResponseChannel());
 					}
+
 					@Override
 					public void failed(IOException ex) {
 						onFailure(latch, ex);
@@ -389,7 +407,6 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 		}
 
 		@Override
-		@SuppressWarnings("deprecation")
 		public void handleEvent(StreamSourceChannel channel) {
 			if (this.session.isDisconnected()) {
 				if (logger.isDebugEnabled()) {
@@ -399,11 +416,11 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 				throw new SockJsException("Session closed.", this.session.getId(), null);
 			}
 
-			org.xnio.Pooled<ByteBuffer> pooled = this.connection.getBufferPool().allocate();
+			Object pooled = undertowBufferSupport.allocatePooledResource();
 			try {
 				int r;
 				do {
-					ByteBuffer buffer = pooled.getResource();
+					ByteBuffer buffer = undertowBufferSupport.getByteBuffer(pooled);
 					buffer.clear();
 					r = channel.read(buffer);
 					buffer.flip();
@@ -431,7 +448,7 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 				onFailure(exc);
 			}
 			finally {
-				pooled.free();
+				undertowBufferSupport.closePooledResource(pooled);
 			}
 		}
 
@@ -473,4 +490,116 @@ public class UndertowXhrTransport extends AbstractXhrTransport {
 		}
 	}
 
+	private interface UndertowBufferSupport {
+
+		Object allocatePooledResource();
+
+		ByteBuffer getByteBuffer(Object pooled);
+
+		void closePooledResource(Object pooled);
+
+		void httpClientConnect(UndertowClient httpClient, final ClientCallback<ClientConnection> listener,
+				final URI uri, final XnioWorker worker, OptionMap options);
+
+		IoFuture<ClientConnection> httpClientConnect(UndertowClient httpClient, final URI uri,
+				final XnioWorker worker, OptionMap options);
+	}
+
+	private class Undertow10BufferSupport implements UndertowBufferSupport {
+
+		private final org.xnio.Pool<ByteBuffer> xnioBufferPool;
+
+		private final Method httpClientConnectCallbackMethod;
+
+		private final Method httpClientConnectMethod;
+
+		public Undertow10BufferSupport() {
+			this.xnioBufferPool = new org.xnio.ByteBufferSlicePool(1048, 1048);
+			this.httpClientConnectCallbackMethod = ReflectionUtils.findMethod(UndertowClient.class, "connect",
+					ClientCallback.class, URI.class, XnioWorker.class, Pool.class, OptionMap.class);
+			this.httpClientConnectMethod = ReflectionUtils.findMethod(UndertowClient.class, "connect",
+					URI.class, XnioWorker.class, Pool.class, OptionMap.class);
+		}
+
+		@Override
+		public Object allocatePooledResource() {
+			return this.xnioBufferPool.allocate();
+		}
+
+		@Override
+		@SuppressWarnings("unchecked")
+		public ByteBuffer getByteBuffer(Object pooled) {
+			return ((org.xnio.Pooled<ByteBuffer>) pooled).getResource();
+		}
+
+		@Override
+		@SuppressWarnings("unchecked")
+		public void closePooledResource(Object pooled) {
+			((org.xnio.Pooled<ByteBuffer>) pooled).close();
+		}
+
+		@Override
+		public void httpClientConnect(UndertowClient httpClient, ClientCallback<ClientConnection> listener, URI uri,
+				XnioWorker worker, OptionMap options) {
+			ReflectionUtils.invokeMethod(httpClientConnectCallbackMethod, httpClient, listener, uri, worker,
+					this.xnioBufferPool, options);
+
+		}
+
+		@Override
+		@SuppressWarnings("unchecked")
+		public IoFuture<ClientConnection> httpClientConnect(UndertowClient httpClient, URI uri,
+				XnioWorker worker, OptionMap options) {
+			return (IoFuture<ClientConnection>) ReflectionUtils.invokeMethod(httpClientConnectMethod, httpClient, uri,
+					worker, this.xnioBufferPool, options);
+		}
+	}
+
+	private class Undertow13BufferSupport implements UndertowBufferSupport {
+
+		private final ByteBufferPool undertowBufferPool;
+
+		private final Method httpClientConnectCallbackMethod;
+
+		private final Method httpClientConnectMethod;
+
+		public Undertow13BufferSupport() {
+			this.undertowBufferPool = new DefaultByteBufferPool(false, 1024, -1, 2);
+			this.httpClientConnectCallbackMethod = ReflectionUtils.findMethod(UndertowClient.class, "connect",
+					ClientCallback.class, URI.class, XnioWorker.class, ByteBufferPool.class, OptionMap.class);
+			this.httpClientConnectMethod = ReflectionUtils.findMethod(UndertowClient.class, "connect",
+					URI.class, XnioWorker.class, ByteBufferPool.class, OptionMap.class);
+		}
+
+		@Override
+		public Object allocatePooledResource() {
+			return this.undertowBufferPool.allocate();
+		}
+
+		@Override
+		public ByteBuffer getByteBuffer(Object pooled) {
+			return ((PooledByteBuffer) pooled).getBuffer();
+		}
+
+		@Override
+		public void closePooledResource(Object pooled) {
+			((PooledByteBuffer) pooled).close();
+		}
+
+		@Override
+		public void httpClientConnect(UndertowClient httpClient, ClientCallback<ClientConnection> listener, URI uri,
+				XnioWorker worker, OptionMap options) {
+			ReflectionUtils.invokeMethod(httpClientConnectCallbackMethod, httpClient, listener, uri,
+					this.undertowBufferPool, worker, options);
+		}
+
+		@Override
+		@SuppressWarnings("unchecked")
+		public IoFuture<ClientConnection> httpClientConnect(UndertowClient httpClient, URI uri,
+				XnioWorker worker, OptionMap options) {
+			return (IoFuture<ClientConnection>) ReflectionUtils.invokeMethod(httpClientConnectMethod, httpClient, uri,
+					worker, this.undertowBufferPool, options);
+		}
+	}
+
 }