me.snowdrop.istio.api.internal.MixerSupportRegistry Maven / Gradle / Ivy
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/**
* Copyright 2020 Red Hat, Inc. and/or its affiliates.
*
*
* 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 me.snowdrop.istio.api.internal;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.stream.Collectors;
/**
* @author Christophe Laprun
*/
public class MixerSupportRegistry {
private Map> registry;
public Map> loadFromProperties(String propertiesFileName) {
if (registry == null) {
registry = new HashMap<>(17);
Properties props = new Properties();
try (final InputStream inputStream =
Thread.currentThread().getContextClassLoader().getResourceAsStream(propertiesFileName +
".properties")) {
props.load(inputStream);
} catch (Exception e) {
throw new RuntimeException("Couldn't load " + propertiesFileName + ".properties from classpath", e);
}
registry = props.entrySet().parallelStream().collect(Collectors.toMap(k -> k.getKey().toString(), v -> {
final String className = v.getValue().toString();
try {
return Thread.currentThread().getContextClassLoader().loadClass(className);
} catch (ClassNotFoundException e) {
throw new RuntimeException(className + " doesn't appear to be a known Istio " + propertiesFileName + " class", e);
}
}));
}
return registry;
}
public Class getImplementationClass(String id) {
final Class targetClass = registry.get(id);
if (targetClass == null) {
throw new RuntimeException("No implementation class associated with " + id);
}
return targetClass;
}
}