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// Copyright (C) 2018 The Android Open Source Project
//
// 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.gerrit.server.logging;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.flogger.backend.Tags;
import java.util.concurrent.Callable;
import java.util.logging.Level;
/**
* Logging context for Flogger.
*
* <p>To configure this logging context for Flogger set the following system property (also see
* {@link com.google.common.flogger.backend.system.DefaultPlatform}):
*
* <ul>
* <li>{@code
* flogger.logging_context=com.google.gerrit.server.logging.LoggingContext#getInstance}.
* </ul>
*/
public class LoggingContext extends com.google.common.flogger.backend.system.LoggingContext {
private static final LoggingContext INSTANCE = new LoggingContext();
private static final ThreadLocal<MutableTags> tags = new ThreadLocal<>();
private static final ThreadLocal<Boolean> forceLogging = new ThreadLocal<>();
private LoggingContext() {}
/** This method is expected to be called via reflection (and might otherwise be unused). */
public static LoggingContext getInstance() {
return INSTANCE;
}
public static Runnable copy(Runnable runnable) {
if (runnable instanceof LoggingContextAwareRunnable) {
return runnable;
}
return new LoggingContextAwareRunnable(runnable);
}
public static <T> Callable<T> copy(Callable<T> callable) {
if (callable instanceof LoggingContextAwareCallable) {
return callable;
}
return new LoggingContextAwareCallable<>(callable);
}
@Override
public boolean shouldForceLogging(String loggerName, Level level, boolean isEnabled) {
return isLoggingForced();
}
@Override
public Tags getTags() {
MutableTags mutableTags = tags.get();
return mutableTags != null ? mutableTags.getTags() : Tags.empty();
}
public ImmutableSetMultimap<String, String> getTagsAsMap() {
MutableTags mutableTags = tags.get();
return mutableTags != null ? mutableTags.asMap() : ImmutableSetMultimap.of();
}
boolean addTag(String name, String value) {
return getMutableTags().add(name, value);
}
void removeTag(String name, String value) {
MutableTags mutableTags = getMutableTags();
mutableTags.remove(name, value);
if (mutableTags.isEmpty()) {
tags.remove();
}
}
void setTags(ImmutableSetMultimap<String, String> newTags) {
if (newTags.isEmpty()) {
tags.remove();
return;
}
getMutableTags().set(newTags);
}
void clearTags() {
tags.remove();
}
private MutableTags getMutableTags() {
MutableTags mutableTags = tags.get();
if (mutableTags == null) {
mutableTags = new MutableTags();
tags.set(mutableTags);
}
return mutableTags;
}
boolean isLoggingForced() {
Boolean force = forceLogging.get();
return force != null ? force : false;
}
boolean forceLogging(boolean force) {
Boolean oldValue = forceLogging.get();
if (force) {
forceLogging.set(true);
} else {
forceLogging.remove();
}
return oldValue != null ? oldValue : false;
}
}
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