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117
...ynamodb-hadoop/src/main/java/org/apache/hadoop/dynamodb/util/DynamoDBReflectionUtils.java
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| /** | ||
| * Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file | ||
| * except in compliance with the License. A copy of the License is located at | ||
| * | ||
| * http://aws.amazon.com/apache2.0/ | ||
| * | ||
| * or in the "LICENSE.TXT" file accompanying this file. This file 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. | ||
| */ | ||
|
|
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| package org.apache.hadoop.dynamodb.util; | ||
|
|
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| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.util.Arrays; | ||
| import java.util.Optional; | ||
| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.util.ReflectionUtils; | ||
|
|
||
| /** | ||
| * Reflected-utility methods for DynamoDB connector pkg | ||
| */ | ||
| public class DynamoDBReflectionUtils { | ||
|
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| private static final Log log = LogFactory.getLog(DynamoDBReflectionUtils.class); | ||
|
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| // Default no-arg constructor reflection logic | ||
| public static <T> T createInstanceOf(String className, Configuration conf) { | ||
| return createInstanceOfWithParams(className, conf, null, null); | ||
| } | ||
|
|
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| // constructor with-args reflection logic | ||
| @SuppressWarnings("unchecked") | ||
| public static <T> T createInstanceOfWithParams( | ||
| String className, | ||
| Configuration conf, | ||
| Class<?>[] paramTypes, | ||
| Object[] params) { | ||
| try { | ||
| Class<?> clazz = getClass(className); | ||
| Constructor<T> ctor = paramTypes == null | ||
| ? (Constructor<T>) clazz.getDeclaredConstructor() | ||
| : (Constructor<T>) clazz.getDeclaredConstructor(paramTypes); | ||
| ctor.setAccessible(true); | ||
| T instance = ctor.newInstance(params); | ||
| log.info("Successfully loaded class: " + className); | ||
| ReflectionUtils.setConf(instance, conf); | ||
| log.debug("Configured instance to use conf"); | ||
| return instance; | ||
|
|
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| } catch (NoSuchMethodException | InvocationTargetException e) { | ||
| throw new RuntimeException("Unable to find constructor of class: " + className, e); | ||
| } catch (IllegalAccessException e) { | ||
| throw new RuntimeException("Class being loaded is not accessible: " + className, e); | ||
| } catch (InstantiationException e) { | ||
| throw new RuntimeException("Unable to instantiate class: " + className, e); | ||
| } | ||
| } | ||
|
|
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| // checks if class has method available in it | ||
| public static boolean hasFactoryMethod(String className, String methodName) { | ||
| Class<?> clazz = getClass(className); | ||
| return Arrays.stream(clazz.getMethods()) | ||
| .anyMatch(method -> method.getName().equals(methodName)); | ||
| } | ||
|
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| // factory-based reflection logic that uses a method for object construction | ||
| @SuppressWarnings("unchecked") | ||
| public static <T> T createInstanceFromFactory( | ||
| String className, | ||
| Configuration conf, | ||
| String methodName) { | ||
| try { | ||
| Class<?> clazz = getClass(className); | ||
| Method m = clazz.getDeclaredMethod(methodName); | ||
| m.setAccessible(true); | ||
| T instance = (T) m.invoke(null); | ||
| log.info("Successfully loaded class: " + className); | ||
| ReflectionUtils.setConf(instance, conf); | ||
| log.debug("Configured instance to use conf"); | ||
| return instance; | ||
|
|
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| } catch (NoSuchMethodException e) { | ||
| log.error("Method not found for object construction: " + methodName); | ||
| throw new RuntimeException("Unable to find static method to load class: " + className, e); | ||
| } catch (InvocationTargetException e) { | ||
| log.error("Exception found when invoking method for object construction: " + methodName); | ||
| throw new RuntimeException("Unable to load class: " + className, e); | ||
| } catch (IllegalAccessException e) { | ||
| throw new RuntimeException("Class being loaded is not accessible: " + className, e); | ||
| } | ||
| } | ||
|
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| // checks if class can be loaded | ||
| private static Class<?> getClass(String className) { | ||
| try { | ||
| return Class.forName(className, true, getContextOrDefaultClassLoader()); | ||
| } catch (ClassNotFoundException e) { | ||
| throw new RuntimeException("Unable to locate class to load via reflection: " + className, e); | ||
| } | ||
| } | ||
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| private static ClassLoader getContextOrDefaultClassLoader() { | ||
| return Optional.of(Thread.currentThread().getContextClassLoader()) | ||
| .orElseGet(DynamoDBReflectionUtils::getDefaultClassLoader); | ||
| } | ||
|
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| private static ClassLoader getDefaultClassLoader() { | ||
| return DynamoDBReflectionUtils.class.getClassLoader(); | ||
| } | ||
| } |
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