org.apache.cassandra.utils.Throwables Maven / Gradle / Ivy
Show all versions of cassandra-all Show documentation
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.utils;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Optional;
import java.util.concurrent.CompletionException;
import java.util.concurrent.ExecutionException;
import java.util.function.Predicate;
import java.util.stream.Stream;
import org.apache.cassandra.io.FSReadError;
import org.apache.cassandra.io.FSWriteError;
public final class Throwables
{
public enum FileOpType { READ, WRITE }
public interface DiscreteAction
{
void perform() throws E;
}
public static boolean isCausedBy(Throwable t, Predicate cause)
{
return cause.test(t) || (t.getCause() != null && cause.test(t.getCause()));
}
public static boolean anyCauseMatches(Throwable t, Predicate cause)
{
do
{
if (cause.test(t))
return true;
} while ((t = t.getCause()) != null);
return false;
}
public static T merge(T existingFail, T newFail)
{
if (existingFail == null)
return newFail;
existingFail.addSuppressed(newFail);
return existingFail;
}
public static void maybeFail(Throwable fail)
{
if (failIfCanCast(fail, null))
throw new RuntimeException(fail);
}
public static void maybeFail(Throwable fail, Class checked) throws T
{
if (failIfCanCast(fail, checked))
throw new RuntimeException(fail);
}
public static boolean failIfCanCast(Throwable fail, Class checked) throws T
{
if (fail == null)
return false;
if (fail instanceof Error)
throw (Error) fail;
if (fail instanceof RuntimeException)
throw (RuntimeException) fail;
if (checked != null && checked.isInstance(fail))
throw checked.cast(fail);
return true;
}
@SafeVarargs
public static void maybeFail(DiscreteAction ... actions)
{
maybeFail(Throwables.perform(null, Stream.of(actions)));
}
@SafeVarargs
public static void perform(DiscreteAction ... actions) throws E
{
Throwables.perform(Stream.of(actions));
}
public static void perform(Stream> stream, DiscreteAction ... extra) throws E
{
perform(Stream.concat(stream, Stream.of(extra)));
}
@SuppressWarnings("unchecked")
public static void perform(Stream> actions) throws E
{
Throwable fail = perform(null, actions);
if (failIfCanCast(fail, null))
throw (E) fail;
}
public static Throwable perform(Throwable accumulate, DiscreteAction ... actions)
{
return perform(accumulate, Arrays.stream(actions));
}
public static Throwable perform(Throwable accumulate, Stream> actions)
{
return perform(accumulate, actions.iterator());
}
public static Throwable perform(Throwable accumulate, Iterator> actions)
{
while (actions.hasNext())
{
DiscreteAction action = actions.next();
try
{
action.perform();
}
catch (Throwable t)
{
accumulate = merge(accumulate, t);
}
}
return accumulate;
}
@SafeVarargs
public static void perform(File against, FileOpType opType, DiscreteAction ... actions)
{
perform(against.getPath(), opType, actions);
}
@SafeVarargs
public static void perform(String filePath, FileOpType opType, DiscreteAction ... actions)
{
maybeFail(perform(null, filePath, opType, actions));
}
@SafeVarargs
public static Throwable perform(Throwable accumulate, String filePath, FileOpType opType, DiscreteAction ... actions)
{
return perform(accumulate, filePath, opType, Arrays.stream(actions));
}
public static Throwable perform(Throwable accumulate, String filePath, FileOpType opType, Stream> actions)
{
return perform(accumulate, actions.map((action) -> () ->
{
try
{
action.perform();
}
catch (IOException e)
{
throw (opType == FileOpType.WRITE) ? new FSWriteError(e, filePath) : new FSReadError(e, filePath);
}
}));
}
public static Throwable close(Throwable accumulate, Iterable closeables)
{
for (AutoCloseable closeable : closeables)
{
try
{
closeable.close();
}
catch (Throwable t)
{
accumulate = merge(accumulate, t);
}
}
return accumulate;
}
public static Optional extractIOExceptionCause(Throwable t)
{
if (t instanceof IOException)
return Optional.of((IOException) t);
Throwable cause = t;
while ((cause = cause.getCause()) != null)
{
if (cause instanceof IOException)
return Optional.of((IOException) cause);
}
return Optional.empty();
}
/**
* If the provided throwable is a "wrapping" exception (see below), return the cause of that throwable, otherwise
* return its argument untouched.
*
* We call a "wrapping" exception in the context of that method an exception whose only purpose is to wrap another
* exception, and currently this method recognize only 2 exception as "wrapping" ones: {@link ExecutionException}
* and {@link CompletionException}.
*/
public static Throwable unwrapped(Throwable t)
{
Throwable unwrapped = t;
while (unwrapped instanceof CompletionException ||
unwrapped instanceof ExecutionException ||
unwrapped instanceof InvocationTargetException)
unwrapped = unwrapped.getCause();
// I don't think it make sense for those 2 exception classes to ever be used with null causes, but no point
// in failing here if this happen. We still wrap the original exception if that happen so we get a sign
// that the assumption of this method is wrong.
return unwrapped == null
? new RuntimeException("Got wrapping exception not wrapping anything", t)
: unwrapped;
}
/**
* If the provided exception is unchecked, return it directly, otherwise wrap it into a {@link RuntimeException}
* to make it unchecked.
*/
public static RuntimeException unchecked(Throwable t)
{
return t instanceof RuntimeException ? (RuntimeException)t : new RuntimeException(t);
}
/**
* throw the exception as a unchecked exception, wrapping if a checked exception, else rethroing as is.
*/
public static RuntimeException throwAsUncheckedException(Throwable t)
{
if (t instanceof Error)
throw (Error) t;
throw unchecked(t);
}
/**
* A shortcut for {@code unchecked(unwrapped(t))}. This is called "cleaned" because this basically removes the annoying
* cruft surrounding an exception :).
*/
public static RuntimeException cleaned(Throwable t)
{
return unchecked(unwrapped(t));
}
}