Replace close() method with dispose()/isDisposed() (#456)

Author: Ryland Degnan

rsocket-core/src/jmh/java/io/rsocket/RSocketPerf.java

@@ -79,7 +79,7 @@ public static class Input {
 
     static final ByteBuffer HELLO = ByteBuffer.wrap("HELLO".getBytes(StandardCharsets.UTF_8));
 
-    static final Payload HELLO_PAYLOAD = new DefaultPayload(HELLO);
+    static final Payload HELLO_PAYLOAD = DefaultPayload.create(HELLO);
 
     static final DirectProcessor<Frame> clientReceive = DirectProcessor.create();
     static final DirectProcessor<Frame> serverReceive = DirectProcessor.create();
@@ -121,8 +121,7 @@ public Mono<Void> metadataPush(Payload payload) {
                         }
 
                         @Override
-                        public Mono<Void> close() {
-                          return Mono.empty();
+                        public void dispose() {
                         }
 
                         @Override
@@ -140,8 +139,13 @@ public Mono<Void> onClose() {
                         MonoProcessor<Void> onClose = MonoProcessor.create();
 
                         @Override
-                        public Mono<Void> close() {
-                          return Mono.empty().doFinally(s -> onClose.onComplete()).then();
+                        public void dispose() {
+                          onClose.onComplete();
+                        }
+
+                        @Override
+                        public boolean isDisposed() {
+                          return onClose.isDisposed();
                         }
 
                         @Override

rsocket-core/src/jmh/java/io/rsocket/perfutil/TestDuplexConnection.java

@@ -68,8 +68,7 @@ public double availability() {
   }
 
   @Override
-  public Mono<Void> close() {
-    return Mono.empty();
+  public void dispose() {
   }
 
   @Override

rsocket-core/src/main/java/io/rsocket/AbstractRSocket.java

@@ -24,9 +24,6 @@
 /**
  * An abstract implementation of {@link RSocket}. All request handling methods emit {@link
  * UnsupportedOperationException} and hence must be overridden to provide a valid implementation.
- *
- * <p>{@link #close()} returns a {@code Publisher} that immediately terminates. That same Publisher
- * is returned by the {@link #onClose()} method.
  */
 public abstract class AbstractRSocket implements RSocket {
 
@@ -58,12 +55,13 @@ public Mono<Void> metadataPush(Payload payload) {
   }
 
   @Override
-  public Mono<Void> close() {
-    return Mono.defer(
-        () -> {
-          onClose.onComplete();
-          return onClose;
-        });
+  public void dispose() {
+    onClose.onComplete();
+  }
+
+  @Override
+  public boolean isDisposed() {
+    return onClose.isDisposed();
   }
 
   @Override

rsocket-core/src/main/java/io/rsocket/Closeable.java

@@ -16,24 +16,14 @@
 
 package io.rsocket;
 
+import reactor.core.Disposable;
 import reactor.core.publisher.Mono;
 
 /** */
-public interface Closeable {
-  /**
-   * Close this {@code RSocket} upon subscribing to the returned {@code Publisher}
-   *
-   * <p><em>This method is idempotent and hence can be called as many times at any point with same
-   * outcome.</em>
-   *
-   * @return A {@code Publisher} that triggers the close when subscribed to and that completes when
-   *     this {@code RSocket} close is complete.
-   */
-  Mono<Void> close();
-
+public interface Closeable extends Disposable {
   /**
    * Returns a {@code Publisher} that completes when this {@code RSocket} is closed. A {@code
-   * RSocket} can be closed by explicitly calling {@link #close()} or when the underlying transport
+   * RSocket} can be closed by explicitly calling {@link RSocket#dispose()} or when the underlying transport
    * connection is closed.
    *
    * @return A {@code Publisher} that completes when this {@code RSocket} close is complete.

rsocket-core/src/main/java/io/rsocket/DuplexConnection.java

@@ -74,4 +74,9 @@ default Mono<Void> sendOne(Frame frame) {
    * @return Stream of all {@code Frame}s received.
    */
   Flux<Frame> receive();
+
+  @Override
+  default double availability() {
+    return isDisposed() ? 0.0 : 1.0;
+  }
 }

rsocket-core/src/main/java/io/rsocket/RSocket.java

@@ -71,6 +71,6 @@ public interface RSocket extends Availability, Closeable {
 
   @Override
   default double availability() {
-    return 0.0;
+    return isDisposed() ? 0.0 : 1.0;
   }
 }

rsocket-core/src/main/java/io/rsocket/RSocketClient.java

@@ -98,7 +98,7 @@ class RSocketClient implements RSocket {
               .doOnError(
                   t -> {
                     errorConsumer.accept(t);
-                    connection.close().subscribe();
+                    connection.dispose();
                   })
               .subscribe();
     }
@@ -234,8 +234,13 @@ public double availability() {
   }
 
   @Override
-  public Mono<Void> close() {
-    return connection.close();
+  public void dispose() {
+    connection.dispose();
+  }
+
+  @Override
+  public boolean isDisposed() {
+    return connection.isDisposed();
   }
 
   @Override
@@ -260,25 +265,25 @@ public Flux<Payload> handleRequestStream(final Payload payload) {
               return receiver
                   .doOnRequest(
                       l -> {
-                        if (first.compareAndSet(false, true) && !receiver.isTerminated()) {
+                        if (first.compareAndSet(false, true) && !receiver.isDisposed()) {
                           final Frame requestFrame =
                               Frame.Request.from(streamId, FrameType.REQUEST_STREAM, payload, l);
                           payload.release();
                           sendProcessor.onNext(requestFrame);
-                        } else if (contains(streamId) && !receiver.isTerminated()) {
+                        } else if (contains(streamId) && !receiver.isDisposed()) {
                           sendProcessor.onNext(Frame.RequestN.from(streamId, l));
                         }
                         sendProcessor.drain();
                       })
                   .doOnError(
                       t -> {
-                        if (contains(streamId) && !receiver.isTerminated()) {
+                        if (contains(streamId) && !receiver.isDisposed()) {
                           sendProcessor.onNext(Frame.Error.from(streamId, t));
                         }
                       })
                   .doOnCancel(
                       () -> {
-                        if (contains(streamId) && !receiver.isTerminated()) {
+                        if (contains(streamId) && !receiver.isDisposed()) {
                           sendProcessor.onNext(Frame.Cancel.from(streamId));
                         }
                       })
@@ -326,7 +331,7 @@ private Flux<Payload> handleChannel(Flux<Payload> request, FrameType requestType
               boolean firstRequest = true;
 
               boolean isValidToSendFrame() {
-                return contains(streamId) && !receiver.isTerminated();
+                return contains(streamId) && !receiver.isDisposed();
               }
 
               void sendOneFrame(Frame frame) {

rsocket-core/src/main/java/io/rsocket/RSocketFactory.java

@@ -342,7 +342,7 @@ private Mono<? extends Void> processSetupFrame(
           return multiplexer
               .asStreamZeroConnection()
               .sendOne(Frame.Error.from(0, error))
-              .then(multiplexer.close());
+              .doFinally(signalType -> multiplexer.dispose());
         }
 
         ConnectionSetupPayload setupPayload = ConnectionSetupPayload.create(setupFrame);

rsocket-core/src/main/java/io/rsocket/RSocketServer.java

@@ -200,8 +200,13 @@ public Mono<Void> metadataPush(Payload payload) {
   }
 
   @Override
-  public Mono<Void> close() {
-    return connection.close();
+  public void dispose() {
+    connection.dispose();
+  }
+
+  @Override
+  public boolean isDisposed() {
+    return connection.isDisposed();
   }
 
   @Override
@@ -213,7 +218,7 @@ private void cleanup() {
     cleanUpSendingSubscriptions();
     cleanUpChannelProcessors();
 
-    requestHandler.close().subscribe();
+    requestHandler.dispose();
   }
 
   private synchronized void cleanUpSendingSubscriptions() {

rsocket-core/src/main/java/io/rsocket/fragmentation/FragmentationDuplexConnection.java

@@ -85,20 +85,13 @@ public Flux<Frame> receive() {
   }
 
   @Override
-  public Mono<Void> close() {
-    return source.close();
+  public void dispose() {
+    source.dispose();
   }
 
-  private synchronized FrameReassembler getFrameReassembler(Frame frame) {
-    return frameReassemblers.computeIfAbsent(frame.getStreamId(), s -> new FrameReassembler(frame));
-  }
-
-  private synchronized FrameReassembler removeFrameReassembler(int streamId) {
-    return frameReassemblers.remove(streamId);
-  }
-
-  private synchronized boolean frameReassemblersContain(int streamId) {
-    return frameReassemblers.containsKey(streamId);
+  @Override
+  public boolean isDisposed() {
+    return source.isDisposed();
   }
 
   @Override
@@ -114,4 +107,16 @@ public Mono<Void> onClose() {
               }
             });
   }
+
+  private synchronized FrameReassembler getFrameReassembler(Frame frame) {
+    return frameReassemblers.computeIfAbsent(frame.getStreamId(), s -> new FrameReassembler(frame));
+  }
+
+  private synchronized FrameReassembler removeFrameReassembler(int streamId) {
+    return frameReassemblers.remove(streamId);
+  }
+
+  private synchronized boolean frameReassemblersContain(int streamId) {
+    return frameReassemblers.containsKey(streamId);
+  }
 }

rsocket-core/src/main/java/io/rsocket/internal/ClientServerInputMultiplexer.java

@@ -16,6 +16,7 @@
 
 package io.rsocket.internal;
 
+import io.rsocket.Closeable;
 import io.rsocket.DuplexConnection;
 import io.rsocket.Frame;
 import io.rsocket.FrameType;
@@ -41,7 +42,7 @@
  * even. Even IDs are for the streams initiated by server and odds are for streams initiated by the
  * client.
  */
-public class ClientServerInputMultiplexer {
+public class ClientServerInputMultiplexer implements Closeable {
   private static final Logger LOGGER = LoggerFactory.getLogger("io.rsocket.FrameLogger");
 
   private final DuplexConnection streamZeroConnection;
@@ -112,8 +113,19 @@ public DuplexConnection asStreamZeroConnection() {
     return streamZeroConnection;
   }
 
-  public Mono<Void> close() {
-    return source.close();
+  @Override
+  public void dispose() {
+    source.dispose();
+  }
+
+  @Override
+  public boolean isDisposed() {
+    return source.isDisposed();
+  }
+
+  @Override
+  public Mono<Void> onClose() {
+    return source.onClose();
   }
 
   private static class InternalDuplexConnection implements DuplexConnection {
@@ -158,8 +170,13 @@ public Flux<Frame> receive() {
     }
 
     @Override
-    public Mono<Void> close() {
-      return source.close();
+    public void dispose() {
+      source.dispose();
+    }
+
+    @Override
+    public boolean isDisposed() {
+      return source.isDisposed();
     }
 
     @Override

rsocket-core/src/main/java/io/rsocket/util/CloseableAdapter.java

@@ -60,8 +60,13 @@ public double availability() {
   }
 
   @Override
-  public Mono<Void> close() {
-    return source.close();
+  public void dispose() {
+    source.dispose();
+  }
+
+  @Override
+  public boolean isDisposed() {
+    return source.isDisposed();
   }
 
   @Override