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/*
* Copyright © 2016-2017 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.LoggerCreationService;
import org.openecomp.sdc.logging.spi.LoggingContextService;
import org.openecomp.sdc.logging.spi.LoggingServiceProvider;
import java.util.Iterator;
import java.util.Optional;
import java.util.ServiceLoader;
/**
* <p>Binds to a concrete implementation of logging services.</p>
* <p>In order to use the factory, a particular (e.g. framework-specific) implementation of a service must be
* configured as described in
* <a href="http://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html">java.util.ServiceLoader</a>).</p>
*
* @author evitaliy
* @see ServiceLoader
* @since 13 Sep 2016
*/
// No advanced logging can be used here because we don't know
// which underlying implementation will be used
@SuppressWarnings({"UseOfSystemOutOrSystemErr", "squid:S106"})
class ServiceBinder {
private static final LoggingServiceProvider PROVIDER = lookupProvider();
private ServiceBinder() {
// prevent instantiation
}
private static LoggingServiceProvider lookupProvider() {
ServiceLoader<LoggingServiceProvider> loader = ServiceLoader.load(LoggingServiceProvider.class);
Iterator<LoggingServiceProvider> iterator = loader.iterator();
if (!iterator.hasNext()) {
System.err.printf("[ERROR] No provider configured for logging services %s. "
+ "Default implementation will be used.\n", LoggingServiceProvider.class.getName());
return null;
}
try {
LoggingServiceProvider provider = iterator.next();
if (!iterator.hasNext()) {
return provider;
}
Logger logger = provider.getLogger(ServiceBinder.class);
if (logger.isWarnEnabled()) {
logger.warn("More than one provider for logging services {} found",
LoggingServiceProvider.class.getName());
}
return provider;
} catch (Exception e) {
// don't fail if the provider cannot be instantiated
e.printStackTrace(System.err);
return null;
}
}
static Optional<LoggingContextService> getContextServiceBinding() {
return Optional.ofNullable(PROVIDER);
}
static Optional<LoggerCreationService> getCreationServiceBinding() {
return Optional.ofNullable(PROVIDER);
}
}
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