（十六）ArkCompiler 能耗优化：编译时插入能耗探针与应用能耗降低策略 原创

public class Calculator {                    public static int add(int a, int b) {                        return a + b;                    }                }
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import com.sun.source.tree.MethodTree;                import com.sun.source.util.TreePath;                import com.sun.source.util.TreePathScanner;                import com.sun.source.util.Trees;                import javax.annotation.processing.*;                import javax.lang.model.SourceVersion;                import javax.lang.model.element.Element;                import javax.lang.model.element.TypeElement;                import javax.tools.Diagnostic;                import java.util.Set;                                 @SupportedAnnotationTypes("*")                @SupportedSourceVersion(SourceVersion.RELEASE_8)                public class EnergyProbeProcessor extends AbstractProcessor {                                     private Trees trees;                                     @Override                    public synchronized void init(ProcessingEnvironment processingEnv) {                        super.init(processingEnv);                        trees = Trees.instance(processingEnv);                    }                                     @Override                    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {                        for (Element element : roundEnv.getRootElements()) {                            TreePath path = trees.getPath(element);                            new MethodVisitor().scan(path, null);                        }                        return false;                    }                                     private class MethodVisitor extends TreePathScanner<Void, Void> {                        @Override                        public Void visitMethod(MethodTree methodTree, Void aVoid) {                            // 在方法开始处插入能耗探针代码                            processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Inserting energy probe at the start of method: " + methodTree.getName());                            // 在方法结束处插入能耗探针代码                            processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Inserting energy probe at the end of method: " + methodTree.getName());                            return super.visitMethod(methodTree, aVoid);                        }                    }                }
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public class QuickSort {                    public static void quickSort(int[] arr, int low, int high) {                        if (low < high) {                            int pi = partition(arr, low, high);                            quickSort(arr, low, pi - 1);                            quickSort(arr, pi + 1, high);                        }                    }                                     private static int partition(int[] arr, int low, int high) {                        int pivot = arr[high];                        int i = (low - 1);                        for (int j = low; j < high; j++) {                            if (arr[j] < pivot) {                                i++;                                int temp = arr[i];                                arr[i] = arr[j];                                arr[j] = temp;                            }                        }                        int temp = arr[i + 1];                        arr[i + 1] = arr[high];                        arr[high] = temp;                        return i + 1;                    }                }
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import java.io.FileInputStream;                import java.io.IOException;                                 public class FileExample {                    public static void main(String[] args) {                        FileInputStream fis = null;                        try {                            fis = new FileInputStream("example.txt");                            // 读取文件内容                        } catch (IOException e) {                            e.printStackTrace();                        } finally {                            if (fis != null) {                                try {                                    fis.close();                                } catch (IOException e) {                                    e.printStackTrace();                                }                            }                        }                    }                }
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import java.util.HashMap;                import java.util.Map;                                 public class CacheExample {                    private static Map<String, Object> cache = new HashMap<>();                                     public static Object getData(String key) {                        if (cache.containsKey(key)) {                            return cache.get(key);                        } else {                            // 从数据库或网络中获取数据                            Object data = fetchDataFromSource(key);                            cache.put(key, data);                            return data;                        }                    }                                     private static Object fetchDataFromSource(String key) {                        // 模拟从数据库或网络中获取数据                        return new Object();                    }                }
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