Add RSocket to RSocketClient adapter (#891)

Author: rstoyanchev

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

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2015-2018 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
+ *
+ *     http://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 io.rsocket;
 
 import org.reactivestreams.Publisher;

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

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2015-2020 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
+ *
+ *     http://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 io.rsocket.core;
+
+import io.rsocket.Payload;
+import io.rsocket.RSocket;
+import io.rsocket.RSocketClient;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+/**
+ * Simple adapter from {@link RSocket} to {@link RSocketClient}. This is useful in code that needs
+ * to deal with both in the same way. When connecting to a server, typically {@link RSocketClient}
+ * is expected to be used, but in a responder (client or server), it is necessary to interact with
+ * {@link RSocket} to make requests to the remote end.
+ *
+ * @since 1.1
+ */
+public class RSocketClientAdapter implements RSocketClient {
+
+  private final RSocket rsocket;
+
+  public RSocketClientAdapter(RSocket rsocket) {
+    this.rsocket = rsocket;
+  }
+
+  public RSocket rsocket() {
+    return rsocket;
+  }
+
+  @Override
+  public Mono<RSocket> source() {
+    return Mono.just(rsocket);
+  }
+
+  @Override
+  public Mono<Void> fireAndForget(Mono<Payload> payloadMono) {
+    return payloadMono.flatMap(rsocket::fireAndForget);
+  }
+
+  @Override
+  public Mono<Payload> requestResponse(Mono<Payload> payloadMono) {
+    return payloadMono.flatMap(rsocket::requestResponse);
+  }
+
+  @Override
+  public Flux<Payload> requestStream(Mono<Payload> payloadMono) {
+    return payloadMono.flatMapMany(rsocket::requestStream);
+  }
+
+  @Override
+  public Flux<Payload> requestChannel(Publisher<Payload> payloads) {
+    return rsocket.requestChannel(payloads);
+  }
+
+  @Override
+  public Mono<Void> metadataPush(Mono<Payload> payloadMono) {
+    return payloadMono.flatMap(rsocket::metadataPush);
+  }
+
+  @Override
+  public void dispose() {
+    rsocket.dispose();
+  }
+}