Copyright 2016 Netflix, Inc.

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.
/**
 * Copyright 2016 Netflix, Inc.
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.netflix.hystrix.strategy;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import com.netflix.hystrix.strategy.properties.HystrixDynamicProperties;

Author:
agentgt
@ExcludeFromJavadoc
/**
 * @ExcludeFromJavadoc
 * @author agentgt
 */
class HystrixArchaiusHelper {

    
To keep class loading minimal for those that have archaius in the classpath but choose not to use it.
Author:
agent
@ExcludeFromJavadoc
/**
     * To keep class loading minimal for those that have archaius in the classpath but choose not to use it.
     * @ExcludeFromJavadoc
     * @author agent
     */
    private static class LazyHolder {
        private final static Method loadCascadedPropertiesFromResources;
        private final static String CONFIG_MANAGER_CLASS = "com.netflix.config.ConfigurationManager";
    
        static {
            Method load = null;
            try {
                Class<?> configManager = Class.forName(CONFIG_MANAGER_CLASS);
                load = configManager.getMethod("loadCascadedPropertiesFromResources", String.class);
            } catch (Exception e) {
            }
    
            loadCascadedPropertiesFromResources = load;
        }
    }

    
@ExcludeFromJavadoc
/**
     * @ExcludeFromJavadoc
     */
    static boolean isArchaiusV1Available() {
        return LazyHolder.loadCascadedPropertiesFromResources != null;
    }

    static void loadCascadedPropertiesFromResources(String name) {
        if (isArchaiusV1Available()) {
            try {
                LazyHolder.loadCascadedPropertiesFromResources.invoke(null, name);
            } catch (IllegalAccessException e) {
            } catch (IllegalArgumentException e) {
            } catch (InvocationTargetException e) {
            }
        }
    }

    
@ExcludeFromJavadoc
/**
     * @ExcludeFromJavadoc
     */
    static HystrixDynamicProperties createArchaiusDynamicProperties() {
        if (isArchaiusV1Available()) {
            loadCascadedPropertiesFromResources("hystrix-plugins");
            try {
                Class<?> defaultProperties = Class.forName(
                        "com.netflix.hystrix.strategy.properties.archaius" + ".HystrixDynamicPropertiesArchaius");
                return (HystrixDynamicProperties) defaultProperties.newInstance();
            } catch (ClassNotFoundException e) {
                throw new RuntimeException(e);
            } catch (InstantiationException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }
        // Fallback to System properties.
        return null;
    }

}