Support propagating trace context to callback

instrument-starters/opentracing-spring-cloud-core/src/main/java/io/opentracing/contrib/spring/cloud/async/instrument/TracedListenableFuture.java

@@ -0,0 +1,86 @@
+/**
+ * Copyright 2017-2020 The OpenTracing 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.opentracing.contrib.spring.cloud.async.instrument;
+
+import io.opentracing.Span;
+import io.opentracing.Tracer;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import org.springframework.util.concurrent.FailureCallback;
+import org.springframework.util.concurrent.ListenableFuture;
+import org.springframework.util.concurrent.ListenableFutureCallback;
+import org.springframework.util.concurrent.SuccessCallback;
+
+/**
+ * @author MiNG
+ */
+public class TracedListenableFuture<T> implements ListenableFuture<T> {
+
+  private final ListenableFuture<T> delegate;
+  private final Tracer tracer;
+  private final Span span;
+
+  public TracedListenableFuture(ListenableFuture<T> delegate, Tracer tracer) {
+    this(delegate, tracer, tracer.activeSpan());
+  }
+
+  public TracedListenableFuture(ListenableFuture<T> delegate, Tracer tracer, Span span) {
+    this.delegate = delegate;
+    this.tracer = tracer;
+    this.span = span;
+  }
+
+  @Override
+  public void addCallback(ListenableFutureCallback<? super T> callback) {
+    delegate.addCallback(new TracedListenableFutureCallback<>(callback, tracer, span));
+  }
+
+  @Override
+  public void addCallback(SuccessCallback<? super T> successCallback, FailureCallback failureCallback) {
+    delegate.addCallback(new TracedListenableFutureCallback<>(successCallback, failureCallback, tracer, span));
+  }
+
+  @Override
+  public CompletableFuture<T> completable() {
+    return delegate.completable();
+  }
+
+  @Override
+  public boolean cancel(boolean mayInterruptIfRunning) {
+    return delegate.cancel(mayInterruptIfRunning);
+  }
+
+  @Override
+  public boolean isCancelled() {
+    return delegate.isCancelled();
+  }
+
+  @Override
+  public boolean isDone() {
+    return delegate.isDone();
+  }
+
+  @Override
+  public T get() throws InterruptedException, ExecutionException {
+    return delegate.get();
+  }
+
+  @Override
+  public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
+    return delegate.get(timeout, unit);
+  }
+}

instrument-starters/opentracing-spring-cloud-core/src/main/java/io/opentracing/contrib/spring/cloud/async/instrument/TracedListenableFutureCallback.java

@@ -0,0 +1,69 @@
+/**
+ * Copyright 2017-2020 The OpenTracing 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.opentracing.contrib.spring.cloud.async.instrument;
+
+import io.opentracing.Scope;
+import io.opentracing.Span;
+import io.opentracing.Tracer;
+import org.springframework.lang.Nullable;
+import org.springframework.util.Assert;
+import org.springframework.util.concurrent.FailureCallback;
+import org.springframework.util.concurrent.ListenableFutureCallback;
+import org.springframework.util.concurrent.SuccessCallback;
+
+/**
+ * @author MiNG
+ */
+public class TracedListenableFutureCallback<T> implements ListenableFutureCallback<T> {
+
+  private final SuccessCallback<T> successDelegate;
+  private final FailureCallback failureDelegate;
+  private final Tracer tracer;
+  private final Span span;
+
+  public TracedListenableFutureCallback(ListenableFutureCallback<T> delegate, Tracer tracer) {
+    this(delegate, delegate, tracer, tracer.activeSpan());
+  }
+
+  public TracedListenableFutureCallback(ListenableFutureCallback<T> delegate, Tracer tracer, Span span) {
+    this(delegate, delegate, tracer, span);
+  }
+
+  public TracedListenableFutureCallback(SuccessCallback<T> successDelegate, FailureCallback failureDelegate, Tracer tracer) {
+    this(successDelegate, failureDelegate, tracer, tracer.activeSpan());
+  }
+
+  public TracedListenableFutureCallback(@Nullable SuccessCallback<T> successDelegate, @Nullable FailureCallback failureDelegate, Tracer tracer, Span span) {
+    Assert.notNull(successDelegate, "'successDelegate' must not be null");
+    Assert.notNull(failureDelegate, "'failureDelegate' must not be null");
+    this.successDelegate = successDelegate;
+    this.failureDelegate = failureDelegate;
+    this.tracer = tracer;
+    this.span = span;
+  }
+
+  @Override
+  public void onSuccess(T result) {
+    try (Scope ignored = span == null ? null : tracer.scopeManager().activate(span)) {
+      successDelegate.onSuccess(result);
+    }
+  }
+
+  @Override
+  public void onFailure(Throwable ex) {
+    try (Scope ignored = span == null ? null : tracer.scopeManager().activate(span)) {
+      failureDelegate.onFailure(ex);
+    }
+  }
+}

instrument-starters/opentracing-spring-cloud-core/src/main/java/io/opentracing/contrib/spring/cloud/async/instrument/TracedThreadPoolTaskExecutor.java

@@ -1,5 +1,5 @@
 /**
- * Copyright 2017-2019 The OpenTracing Authors
+ * Copyright 2017-2020 The OpenTracing 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
@@ -59,12 +59,12 @@ public <T> Future<T> submit(Callable<T> task) {
 
   @Override
   public ListenableFuture<?> submitListenable(Runnable task) {
-    return this.delegate.submitListenable(new TracedRunnable(task, tracer));
+    return new TracedListenableFuture<>(this.delegate.submitListenable(new TracedRunnable(task, tracer)), tracer);
   }
 
   @Override
   public <T> ListenableFuture<T> submitListenable(Callable<T> task) {
-    return this.delegate.submitListenable(new TracedCallable<>(task, tracer));
+    return new TracedListenableFuture<>(this.delegate.submitListenable(new TracedCallable<>(task, tracer)), tracer);
   }
 
   @Override

instrument-starters/opentracing-spring-cloud-core/src/main/java/io/opentracing/contrib/spring/cloud/async/instrument/TracedThreadPoolTaskScheduler.java

@@ -1,5 +1,5 @@
 /**
- * Copyright 2017-2019 The OpenTracing Authors
+ * Copyright 2017-2020 The OpenTracing 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
@@ -26,6 +26,7 @@
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.ThreadFactory;
+
 import org.springframework.lang.Nullable;
 import org.springframework.scheduling.Trigger;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
@@ -113,12 +114,12 @@ public <T> Future<T> submit(Callable<T> task) {
 
   @Override
   public ListenableFuture<?> submitListenable(Runnable task) {
-    return delegate.submitListenable(new TracedRunnable(task, tracer));
+    return new TracedListenableFuture<>(delegate.submitListenable(new TracedRunnable(task, tracer)), tracer);
   }
 
   @Override
   public <T> ListenableFuture<T> submitListenable(Callable<T> task) {
-    return delegate.submitListenable(new TracedCallable<>(task, tracer));
+    return new TracedListenableFuture<>(delegate.submitListenable(new TracedCallable<>(task, tracer)), tracer);
   }
 
   @Override