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/*
* Copyright © 2016-2018 European Support Limited
*
* 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 org.openecomp.sdc.logging.api;
import org.openecomp.sdc.logging.spi.LoggingContextService;
import java.util.Objects;
import java.util.concurrent.Callable;
/**
* <p>Factory to hide a concrete, framework-specific implementation of diagnostic context.</p>
*
* <p>The service used by this factory must implement {@link LoggingContextService}. If no implementation has been
* configured or could be instantiated, a <b>no-op context service</b> will be used, and <b>no context</b> will be
* stored or propagated. No errors will be generated, so that the application can still work (albeit without proper
* logging).</p>
*
* @author evitaliy
* @see ServiceBinder
* @see LoggingContextService
* @since 07 Jan 2018
*/
public class LoggingContext {
private static final LoggingContextService SERVICE =
ServiceBinder.getContextServiceBinding().orElseGet(NoOpLoggingContextService::new);
private LoggingContext() {
// prevent instantiation
}
public static void put(ContextData contextData) {
SERVICE.put(contextData);
}
public static ContextData get() {
return SERVICE.get();
}
public static void clear() {
SERVICE.clear();
}
public static Runnable copyToRunnable(Runnable runnable) {
return SERVICE.copyToRunnable(runnable);
}
public static <V> Callable<V> copyToCallable(Callable<V> callable) {
return SERVICE.copyToCallable(callable);
}
private static class NoOpLoggingContextService implements LoggingContextService {
@Override
public void put(ContextData contextData) {
Objects.requireNonNull(contextData, "Context data cannot be null");
}
@Override
public ContextData get() {
return EmptyContextData.INSTANCE;
}
@Override
public void clear() {
// no-op
}
@Override
public Runnable copyToRunnable(Runnable runnable) {
Objects.requireNonNull(runnable, "Runnable cannot be null");
return runnable;
}
@Override
public <V> Callable<V> copyToCallable(Callable<V> callable) {
Objects.requireNonNull(callable, "Callable cannot be null");
return callable;
}
private static class EmptyContextData {
private static final ContextData INSTANCE = ContextData.builder().build();
private EmptyContextData() {
// prevent instantiation
}
}
}
}
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