rx.exceptions.AssemblyStackTraceException Maven / Gradle / Ivy
/**
* Copyright 2016 Netflix, Inc.
*
* 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 rx.exceptions;
import java.util.*;
import rx.plugins.RxJavaHooks;
/**
* A RuntimeException that is stackless but holds onto a textual
* stacktrace from tracking the assembly location of operators.
* @since 1.3
*/
public final class AssemblyStackTraceException extends RuntimeException {
/** */
private static final long serialVersionUID = 2038859767182585852L;
/**
* Constructs an AssemblyStackTraceException with the given message.
* @param message the message
*/
public AssemblyStackTraceException(String message) {
super(message);
}
@Override
public synchronized Throwable fillInStackTrace() { // NOPMD
return this;
}
/**
* Finds an empty cause slot and assigns itself to it.
* @param exception the exception to start from
*/
public void attachTo(Throwable exception) {
Set memory = new HashSet();
for (;;) {
if (exception.getCause() == null) {
try {
exception.initCause(this);
} catch (IllegalStateException e) {
RxJavaHooks.onError(new RuntimeException(
"Received an exception with a cause set to null, instead of being unset."
+ " To fix this, look down the chain of causes. The last exception had"
+ " a cause explicitly set to null. It should be unset instead.",
exception));
}
return;
}
exception = exception.getCause();
if (!memory.add(exception)) {
// in case we run into a cycle, give up and report this to the hooks
RxJavaHooks.onError(this);
return;
}
}
}
/**
* Locate the first AssemblyStackTraceException in the causal chain of the
* given Throwable (or it if it's one).
* @param e the input throwable
* @return the AssemblyStackTraceException located or null if not found
*/
public static AssemblyStackTraceException find(Throwable e) {
Set memory = new HashSet();
for (;;) {
if (e instanceof AssemblyStackTraceException) {
return (AssemblyStackTraceException)e;
}
if (e == null || e.getCause() == null) {
return null;
}
e = e.getCause();
if (!memory.add(e)) {
return null;
}
}
}
}
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