使用带有两个IntelliJ插件的PicoContainer

Question

我有两个用于IntelliJ的插件。PluginTwo依赖于PluginOne，所以两个是在一个之后启动的。这两个插件都依赖于第三个核心模块。

结构：

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我想通过PluginTwo中的Context-Class访问虚拟类。Context类是核心模块的一部分，并使用PicoContainer来提供对虚拟类的访问。PluginOne在启动时使用PicoContainer创建上下文。现在我想通过PicoContainer从PluginTwo访问虚拟类。

我得到了这个错误：

    2018-09-28 14:25:19,208 [  12588]  ERROR - roject.impl.ProjectManagerImpl - PluginTwoProjectComponent@94a5de2 
java.lang.LinkageError: loader constraint violation: loader (instance of com/intellij/ide/plugins/cl/PluginClassLoader) previously initiated loading for a different type with name "Context"
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
    at com.intellij.util.lang.UrlClassLoader._defineClass(UrlClassLoader.java:276)
    at com.intellij.util.lang.UrlClassLoader.defineClass(UrlClassLoader.java:272)
    at com.intellij.util.lang.UrlClassLoader._findClass(UrlClassLoader.java:241)
    at com.intellij.ide.plugins.cl.PluginClassLoader.a(PluginClassLoader.java:142)
    at com.intellij.ide.plugins.cl.PluginClassLoader.a(PluginClassLoader.java:74)
    at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.java:61)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at PluginTwoProjectComponent.projectOpened(PluginTwoProjectComponent.java:16)

..。

PicoContainer在Context-Class中创建：

private static Context instance;

private final MutablePicoContainer picoContainer;

public static synchronized Context getInstance() {
    if (instance == null) {
        instance = new Context();
    }
    return instance;
}

public Context() {
    picoContainer = new DefaultPicoContainer();
    picoContainer.addComponent(DummyClass.class);
}

public <T> T getComponent(Class<T> clazz) {
    return picoContainer.getComponent(clazz);
}

PluginOneProjectComponent获取上下文的一个实例

public class PluginOneProjectComponent implements ProjectComponent {

    private static Context context;

    private Project project;

    public PluginOneProjectComponent(Project project) {
        this.project = project;
    }

    @Override
    public void projectOpened() {
        System.out.println("PluginOneProjectComponent started with project " + project.getName());
        context = Context.getInstance();

        DummyClass dummy = context.getComponent(DummyClass.class);
        System.out.println("DummyText from PluginOne " + dummy.getText());
        System.out.println("DummyNumber from PluginOne " + dummy.getNumber());
    }

    public static Context getContext() {
        return context;
    }
}

在PluginTwo中，我想使用来自PluginOne的上下文来访问DummyClass。但这并不管用。

public class PluginTwoProjectComponent implements ProjectComponent {

    Project project;

    public PluginTwoProjectComponent(Project project) {
        this.project = project;
    }

    @Override
    public void projectOpened() {
        System.out.println("PluginTwoProjectComponent started with project " + project.getName());
        Context context = PluginOneProjectComponent.getContext();
        DummyClass dummy = context.getComponent(DummyClass.class);
        System.out.println("DummyText from Plugin Two" + dummy.getText());
        System.out.println("DummyNumber from Plugin Two" + dummy.getNumber());
    }
}

因此，输出仅为。

PluginOneProjectComponent started with project HelloWorld
DummyText from PluginOne Some Text
DummyNumber from PluginOne 42
PluginTwoProjectComponent started with project HelloWorld

当我在调试器中的上下文上调用getComponent(DummyClass.class)时，我只得到null作为结果。

有人能帮我吗？有没有更好的方法从PluginOne访问我的Context-Class？

我在这个小项目中重现了这个错误，以便与您分享。我只需要来自PluginOne的PicoContainer就可以在PluginTwo中使用它。完整的源代码可以在这里找到：https://github.com/jafey/intellij-plugin-picocontainer-poc

Answer 1

据我所知，你应该依靠服务的概念来在插件之间通信，因为它们被加载在单独的类加载器中，第一个插件中的X类型与第二个插件中的X类型并不完全相同。

此外，微微上下文的概念意味着对插件是私有的