Prepare Undertow 1.3.0 compatibility

Xnio 3.4.0 will introduce a new source of ByteBuffers: ByteBufferPool.
Previously this feature was offered by Pooled/Pool/ByteBufferSlicePool;
those classes are now marked as deprecated.

As of 1.3.0.Beta9, Undertow still implements the following method in its
ClientConnection interface, using those deprecated types:

    Pool<ByteBuffer> getBufferPool();

This commit prepares compatibility by suppressing warnings in order to
avoid build failures in our build. Once appropriate changes are made in
Undertow, a specific implementation with new types could be introduced.

Issue: SPR-13366

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

@@ -35,14 +35,11 @@ import io.undertow.util.HeaderMap;
 import io.undertow.util.HttpString;
 import io.undertow.util.Methods;
 import io.undertow.util.StringReadChannelListener;
-import org.xnio.ByteBufferSlicePool;
 import org.xnio.ChannelListener;
 import org.xnio.ChannelListeners;
 import org.xnio.IoUtils;
 import org.xnio.OptionMap;
 import org.xnio.Options;
-import org.xnio.Pool;
-import org.xnio.Pooled;
 import org.xnio.Xnio;
 import org.xnio.XnioWorker;
 import org.xnio.channels.StreamSinkChannel;
@@ -96,19 +93,21 @@ public class UndertowXhrTransport extends AbstractXhrTransport implements XhrTra
 
 	private final XnioWorker worker;
 
-	private final Pool<ByteBuffer> bufferPool;
+	@SuppressWarnings("deprecation")
+	private final org.xnio.Pool<ByteBuffer> bufferPool;
 
 
 	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 ByteBufferSlicePool(1048, 1048);
+		this.bufferPool = new org.xnio.ByteBufferSlicePool(1048, 1048);
 	}
 
 
@@ -306,6 +305,7 @@ public class UndertowXhrTransport extends AbstractXhrTransport implements XhrTra
 			public void completed(ClientExchange result) {
 				result.setResponseListener(new ClientCallback<ClientExchange>() {
 					@Override
+					@SuppressWarnings("deprecation")
 					public void completed(final ClientExchange result) {
 						responses.add(result.getResponse());
 						new StringReadChannelListener(result.getConnection().getBufferPool()) {
@@ -389,6 +389,7 @@ public class UndertowXhrTransport extends AbstractXhrTransport implements XhrTra
 		}
 
 		@Override
+		@SuppressWarnings("deprecation")
 		public void handleEvent(StreamSourceChannel channel) {
 			if (this.session.isDisconnected()) {
 				if (logger.isDebugEnabled()) {
@@ -398,7 +399,7 @@ public class UndertowXhrTransport extends AbstractXhrTransport implements XhrTra
 				throw new SockJsException("Session closed.", this.session.getId(), null);
 			}
 
-			Pooled<ByteBuffer> pooled = this.connection.getBufferPool().allocate();
+			org.xnio.Pooled<ByteBuffer> pooled = this.connection.getBufferPool().allocate();
 			try {
 				int r;
 				do {

spring-websocket/src/test/java/org/springframework/web/socket/UndertowTestServer.java

@@ -38,7 +38,6 @@ import org.springframework.util.SocketUtils;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.DispatcherServlet;
 
-import org.xnio.ByteBufferSlicePool;
 import org.xnio.OptionMap;
 import org.xnio.Xnio;
 
@@ -70,6 +69,7 @@ public class UndertowTestServer implements WebSocketTestServer {
 	}
 
 	@Override
+	@SuppressWarnings("deprecation")
 	public void deployConfig(WebApplicationContext wac, Filter... filters) {
 		Assert.state(this.port != -1, "setup() was never called");
 		DispatcherServletInstanceFactory servletFactory = new DispatcherServletInstanceFactory(wac);
@@ -78,7 +78,7 @@ public class UndertowTestServer implements WebSocketTestServer {
 		WebSocketDeploymentInfo info = new WebSocketDeploymentInfo();
 		try {
 			info.setWorker(Xnio.getInstance().createWorker(OptionMap.EMPTY));
-			info.setBuffers(new ByteBufferSlicePool(1024,1024));
+			info.setBuffers(new org.xnio.ByteBufferSlicePool(1024,1024));
 		}
 		catch (IOException ex) {
 			throw new IllegalStateException(ex);