Question

每当我尝试缓存在运行时编译Java类的方法的结果时，第一次一切正常，但是第二次（假设是从缓存中获取结果时），它会给我{{1 }}。我不知道这是不可能实现的还是做错了什么。

这是我使用缓存调用方法的方式：

class Controller
{
    public function __construct($model, $view)
    {
        $this->model = $model;
        $this->view = $view;
    }

    public function show()
    {
        return $this->view->render($this->model->getData());
    }
}

$controller = new Controller();
$controller->show();

这是具有可实现方法的类：

ClassNotFoundException

我得到这个异常：

public void execute() throws Exception {
    MyClass myclass = new MyClass();
    String code = "This is a really long JavaClass that implements CompiledClass"; // Retrieve JavaCode from somewhere
    for (int i = 0; i < 10; i++) {
            CompiledClass obj = myclass.getInstance("NameClassToCompile", code);
    }
}

这是我的Hazelcast配置的方式：

@Component
@CacheConfig(cacheNames = "myCache")
public class MyClass implements SomeClass {

    @Override
    @Cacheable(key = "#name")
    public CompiledClass getInstance(String name, String code) throws CustomException {
        try {
            // Save source in .java file.
            File root = Files.createTempDirectory(null).toFile();
            File sourceFile = new File(root, (this.getClass().getPackage().getName() + File.separator + name).replace('.', '/') + ".java");
            sourceFile.getParentFile().mkdirs();
            Files.write(sourceFile.toPath(), code.getBytes(StandardCharsets.UTF_8));

            // Compile source file.
            JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
            compiler.run(null, null, null, sourceFile.getPath());

            // Load and instantiate compiled class.
            Class<?> cls;
            try (URLClassLoader classLoader = URLClassLoader.newInstance(new URL[]{root.toURI().toURL()})) {
                cls = Class.forName((this.getClass().getPackage().getName() + "." + name), true, classLoader);
            }
            return (CompiledClass) cls.getDeclaredConstructor().newInstance();
        } catch (InvocationTargetException | NoSuchMethodException | InstantiationException | IllegalAccessException | IOException | ClassNotFoundException e) {
            throw new CustomException("didn't work", e);
        }
    }

这是实现所有已编译类的接口。

com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: com.mycompany.myartifact.mypackage.NameClassToCompile

这是在运行时编译的代码示例：

@Bean
public Config hazelCastConfig() {
    return new Config()
        .setInstanceName("hazelcast")
        .addMapConfig(
            new MapConfig()
                .setName("myCache")
                .setMaxSizeConfig(new MaxSizeConfig(200, MaxSizeConfig.MaxSizePolicy.FREE_HEAP_SIZE))
                .setEvictionPolicy(EvictionPolicy.LRU)
                .setTimeToLiveSeconds(20));
}

是否可以缓存运行时编译的类？

0 个答案: