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/*
* Copyright 2000-2011 JetBrains s.r.o.
*
* 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.
*/
package com.intellij.openapi.components.impl;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.components.BaseComponent;
import com.intellij.openapi.components.ComponentManager;
import com.intellij.openapi.components.ServiceDescriptor;
import com.intellij.openapi.components.ex.ComponentManagerEx;
import com.intellij.openapi.extensions.*;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.Disposer;
import com.intellij.util.io.storage.HeavyProcessLatch;
import com.intellij.util.pico.AssignableToComponentAdapter;
import com.intellij.util.pico.ConstructorInjectionComponentAdapter;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.picocontainer.*;
import java.util.Arrays;
import java.util.List;
public class ServiceManagerImpl implements BaseComponent {
private static final ExtensionPointName<ServiceDescriptor> APP_SERVICES = new ExtensionPointName<ServiceDescriptor>("com.intellij.applicationService");
private static final ExtensionPointName<ServiceDescriptor> PROJECT_SERVICES = new ExtensionPointName<ServiceDescriptor>("com.intellij.projectService");
private ExtensionPointName<ServiceDescriptor> myExtensionPointName;
private ExtensionPointListener<ServiceDescriptor> myExtensionPointListener;
public ServiceManagerImpl() {
installEP(APP_SERVICES, ApplicationManager.getApplication());
}
public ServiceManagerImpl(Project project) {
installEP(PROJECT_SERVICES, project);
}
protected ServiceManagerImpl(boolean ignoreInit) {
}
protected void installEP(final ExtensionPointName<ServiceDescriptor> pointName, final ComponentManager componentManager) {
myExtensionPointName = pointName;
final ExtensionPoint<ServiceDescriptor> extensionPoint = Extensions.getArea(null).getExtensionPoint(pointName);
assert extensionPoint != null;
final MutablePicoContainer picoContainer = (MutablePicoContainer)componentManager.getPicoContainer();
myExtensionPointListener = new ExtensionPointListener<ServiceDescriptor>() {
public void extensionAdded(@NotNull final ServiceDescriptor descriptor, final PluginDescriptor pluginDescriptor) {
if (descriptor.overrides) {
ComponentAdapter oldAdapter =
picoContainer.unregisterComponent(descriptor.getInterface());// Allow to re-define service implementations in plugins.
if (oldAdapter == null) {
throw new RuntimeException("Service: " + descriptor.getInterface() + " doesn't override anything");
}
}
picoContainer.registerComponent(new MyComponentAdapter(descriptor, pluginDescriptor, (ComponentManagerEx)componentManager));
}
public void extensionRemoved(@NotNull final ServiceDescriptor extension, final PluginDescriptor pluginDescriptor) {
picoContainer.unregisterComponent(extension.getInterface());
}
};
extensionPoint.addExtensionPointListener(myExtensionPointListener);
}
public List<ServiceDescriptor> getAllDescriptors() {
ServiceDescriptor[] extensions = Extensions.getExtensions(myExtensionPointName);
return Arrays.asList(extensions);
}
@NonNls
@NotNull
public String getComponentName() {
return getClass().getName();
}
public void initComponent() {
}
public void disposeComponent() {
final ExtensionPoint<ServiceDescriptor> extensionPoint = Extensions.getArea(null).getExtensionPoint(myExtensionPointName);
assert extensionPoint != null;
extensionPoint.removeExtensionPointListener(myExtensionPointListener);
}
private static class MyComponentAdapter implements AssignableToComponentAdapter {
private ComponentAdapter myDelegate;
private final ServiceDescriptor myDescriptor;
private final PluginDescriptor myPluginDescriptor;
private final ComponentManagerEx myComponentManager;
private volatile Object myInitializedComponentInstance = null;
public MyComponentAdapter(final ServiceDescriptor descriptor, final PluginDescriptor pluginDescriptor, ComponentManagerEx componentManager) {
myDescriptor = descriptor;
myPluginDescriptor = pluginDescriptor;
myComponentManager = componentManager;
myDelegate = null;
}
public String getComponentKey() {
return myDescriptor.getInterface();
}
public Class getComponentImplementation() {
return loadClass(myDescriptor.getInterface());
}
private Class loadClass(final String className) {
try {
final ClassLoader classLoader = myPluginDescriptor != null ? myPluginDescriptor.getPluginClassLoader() : getClass().getClassLoader();
return Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
public Object getComponentInstance(final PicoContainer container) throws PicoInitializationException, PicoIntrospectionException {
Object instance = myInitializedComponentInstance;
if (instance != null) return instance;
return ApplicationManager.getApplication().runReadAction(new Computable<Object>() {
public Object compute() {
// prevent storages from flushing and blocking FS
HeavyProcessLatch.INSTANCE.processStarted();
try {
synchronized (MyComponentAdapter.this) {
Object instance = myInitializedComponentInstance;
if (instance != null) return instance; // DCL is fine, field is volatile
myInitializedComponentInstance = instance = initializeInstance(container);
return instance;
}
}
finally {
HeavyProcessLatch.INSTANCE.processFinished();
}
}
});
}
protected Object initializeInstance(final PicoContainer container) {
final Object serviceInstance = getDelegate().getComponentInstance(container);
if (serviceInstance instanceof Disposable) {
Disposer.register(myComponentManager, (Disposable)serviceInstance);
}
myComponentManager.initializeComponent(serviceInstance, true);
return serviceInstance;
}
private synchronized ComponentAdapter getDelegate() {
if (myDelegate == null) {
myDelegate = new CachingComponentAdapter(new ConstructorInjectionComponentAdapter(getComponentKey(), loadClass(
myDescriptor.getImplementation()), null, true));
}
return myDelegate;
}
public void verify(final PicoContainer container) throws PicoIntrospectionException {
getDelegate().verify(container);
}
public void accept(final PicoVisitor visitor) {
visitor.visitComponentAdapter(this);
}
public boolean isAssignableTo(Class aClass) {
return aClass.getName().equals(getComponentKey());
}
public String getAssignableToClassName() {
return myDescriptor.getInterface();
}
@Override
public String toString() {
return "ServiceComponentAdapter[" + myDescriptor.getInterface() + "]: implementation=" + myDescriptor.getImplementation() + ", plugin=" + myPluginDescriptor;
}
}
}
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