/*
* Copyright (c) 2011-2017 Pivotal Software Inc, All Rights Reserved.
*
* 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 reactor.core.publisher;
import java.time.
Duration;
import java.util.concurrent.
Callable;
import reactor.core.
CoreSubscriber;
import reactor.core.
Exceptions;
import reactor.core.
Fuseable;
import reactor.core.publisher.
FluxOnAssembly.
AssemblySnapshotException;
import reactor.util.annotation.
Nullable;
/**
* Captures the current stacktrace when this publisher is created and makes it
* available/visible for debugging purposes from the inner Subscriber.
* <p>
* Note that getting a stacktrace is a costly operation.
* <p>
* The operator sanitizes the stacktrace and removes noisy entries such as: <ul>
* <li>java.lang.Thread entries</li> <li>method references with source line of 1 (bridge
* methods)</li> <li>Tomcat worker thread entries</li> <li>JUnit setup</li> </ul>
*
* @param <T> the value type passing through
*
* @see <a href="https://github.com/reactor/reactive-streams-commons">https://github.com/reactor/reactive-streams-commons</a>
*/
final class
MonoCallableOnAssembly<T> extends
MonoOperator<T, T>
implements
Callable<T>,
AssemblyOp {
final
AssemblySnapshotException stacktrace;
MonoCallableOnAssembly(
Mono<? extends T>
source) {
super(
source);
this.
stacktrace = new
AssemblySnapshotException();
}
@
Override
@
Nullable
public T
block() {
//duration is ignored below
return
block(
Duration.
ZERO);
}
@
Override
@
Nullable
@
SuppressWarnings("unchecked")
public T
block(
Duration timeout) {
try {
return ((
Callable<T>)
source).
call();
}
catch (
Throwable e) {
throw
Exceptions.
propagate(
e);
}
}
@
Override
@
SuppressWarnings("unchecked")
public void
subscribe(
CoreSubscriber<? super T>
actual) {
if (
actual instanceof
Fuseable.
ConditionalSubscriber) {
Fuseable.
ConditionalSubscriber<? super T>
cs = (
Fuseable.
ConditionalSubscriber<? super T>)
actual;
source.
subscribe(new
FluxOnAssembly.
OnAssemblyConditionalSubscriber<>(
cs,
stacktrace,
source));
}
else {
source.
subscribe(new
FluxOnAssembly.
OnAssemblySubscriber<>(
actual,
stacktrace,
source));
}
}
@
SuppressWarnings("unchecked")
@
Override
@
Nullable
public T
call() throws
Exception {
return ((
Callable<T>)
source).
call();
}
@
Override
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
ACTUAL_METADATA) return !
stacktrace.
checkpointed;
return super.scanUnsafe(
key);
}
@
Override
public
String stepName() {
return
stacktrace.
operatorAssemblyInformation();
}
@
Override
public
String toString() {
return
stacktrace.
operatorAssemblyInformation();
}
}