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/*
* Copyright © 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.sdcrests.item.rest.services.catalog.notification;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
import org.onap.sdc.tosca.services.YamlUtil;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
import org.openecomp.sdcrests.item.rest.services.catalog.notification.http.HttpConfiguration;
import org.openecomp.sdcrests.item.rest.services.catalog.notification.http.HttpTaskProducer;
import org.openecomp.sdcrests.item.types.ItemAction;
/**
* Creates an instance of {@link Notifier}, initialized according to current configuration.
* The configuration must be passed via the {@link #CONFIG_FILE_PROPERTY} JVM argument.
*/
public class NotifierFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(NotifierFactory.class);
private static final String CONFIG_FILE_PROPERTY = "configuration.yaml";
private static final String CONFIG_SECTION = "catalogNotificationsConfig";
private static final Notifier INSTANCE;
private NotifierFactory() {
// prevent instantiation
}
static {
INSTANCE = createInstance();
}
/**
* Returns a {@link Notifier} instance according to the provided configuration. If no configuration was not
* provided, or the given configuration is incorrect, then an instance with reduced functionality will be returned.
*
* @return available instance of {@link Notifier}
*/
public static Notifier getInstance() {
return INSTANCE;
}
static Notifier createInstance() {
try {
String file = Objects.requireNonNull(System.getProperty(CONFIG_FILE_PROPERTY),
"Config file location must be specified via system property " + CONFIG_FILE_PROPERTY);
Object config = getNotificationConfiguration(file);
ObjectMapper mapper = new ObjectMapper();
HttpConfiguration httpConfig = mapper.convertValue(config, HttpConfiguration.class);
return new AsyncNotifier(new HttpTaskProducer(httpConfig));
} catch (Exception e) {
LOGGER.warn("Failed to initialize notifier. Notifications will not be sent", e);
return new UnsupportedConfigurationNotifier();
}
}
private static Object getNotificationConfiguration(String file) throws IOException {
Map<?, ?> configuration = Objects.requireNonNull(readConfigurationFile(file), "Configuration cannot be empty");
Object notificationConfig = configuration.get(CONFIG_SECTION);
if (notificationConfig == null) {
throw new EntryNotConfiguredException(CONFIG_SECTION + " section");
}
return notificationConfig;
}
private static Map<?, ?> readConfigurationFile(String file) throws IOException {
try (InputStream fileInput = new FileInputStream(file)) {
YamlUtil yamlUtil = new YamlUtil();
return yamlUtil.yamlToMap(fileInput);
}
}
static class UnsupportedConfigurationNotifier implements Notifier {
@Override
public void execute(Collection<String> itemIds, ItemAction action) {
throw new IllegalStateException("Cannot send notifications. The notifier was not properly initialized");
}
}
}
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