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// Copyright 2017 The Bazel Authors. 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 com.google.devtools.build.lib.skyframe.serialization;
import com.google.common.collect.ImmutableList;
import java.io.NotSerializableException;
import java.util.ArrayList;
/** Exception signaling a failure to Serialize or Deserialize an Object. */
public class SerializationException extends Exception {
private final ArrayList<String> trail = new ArrayList<>();
public SerializationException(String msg) {
super(msg);
}
public SerializationException(String msg, Throwable cause) {
super(msg, cause);
}
// No SerializationException(Throwable) overload because serialization errors should always
// provide as much context as possible.
/**
* {@link SerializationException} indicating that Blaze has no serialization schema for an object
* or type of object.
*/
public static class NoCodecException extends SerializationException {
NoCodecException(String message) {
super(message);
}
NoCodecException(String message, Class<?> type) {
super(message);
addTrail(type);
}
NoCodecException(String message, NotSerializableException e) {
super(message, e);
}
NoCodecException(String message, NotSerializableRuntimeException e) {
super(message, e);
}
// Needed for wrapping.
NoCodecException(String message, NoCodecException e) {
super(message, e);
}
}
@Override
public String getMessage() {
return super.getMessage() + (trail.isEmpty() ? "" : " " + trail);
}
/**
* Adds extra tracing info for debugging.
*
* <p>Primarily useful for {@link DynamicCodec}.
*/
public void addTrail(Class<?> type) {
trail.add(type.getName());
}
public ImmutableList<String> getTrailForTesting() {
return ImmutableList.copyOf(trail);
}
/**
* Throws a {@link SerializationException} with the given message and that wraps the given cause.
*
* <p>If the cause is a {@link NoCodecException}, the returned exception will also be a {@code
* NoCodecException}.
*
* <p>The return type is {@link SerializationException} rather than {@code void} so that you can
* call this function from within a {@code throw} statement. Doing so keeps the calling code more
* readable. It also avoids spurious compiler errors, e.g. for using uninitialized variables after
* the {@code throw}.
*/
public static SerializationException propagate(String msg, Throwable cause) {
if (cause instanceof NoCodecException) {
return new NoCodecException(msg, (NoCodecException) cause);
} else {
return new SerializationException(msg, cause);
}
}
}
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