org.apache.dubbo.common.extension.inject.AdaptiveExtensionInjector Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of dubbo Show documentation
Show all versions of dubbo Show documentation
The all in one project of dubbo
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.common.extension.inject;
import org.apache.dubbo.common.context.Lifecycle;
import org.apache.dubbo.common.extension.Adaptive;
import org.apache.dubbo.common.extension.ExtensionAccessor;
import org.apache.dubbo.common.extension.ExtensionInjector;
import org.apache.dubbo.common.extension.ExtensionLoader;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import java.util.stream.Collectors;
/**
* AdaptiveExtensionInjector
*/
@Adaptive
public class AdaptiveExtensionInjector implements ExtensionInjector, Lifecycle {
private Collection injectors = Collections.emptyList();
private ExtensionAccessor extensionAccessor;
public AdaptiveExtensionInjector() {
}
@Override
public void setExtensionAccessor(final ExtensionAccessor extensionAccessor) {
this.extensionAccessor = extensionAccessor;
}
@Override
public void initialize() throws IllegalStateException {
ExtensionLoader loader = extensionAccessor.getExtensionLoader(ExtensionInjector.class);
injectors = loader.getSupportedExtensions().stream()
.map(loader::getExtension)
.collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
}
@Override
public T getInstance(final Class type, final String name) {
return injectors.stream()
.map(injector -> injector.getInstance(type, name))
.filter(Objects::nonNull)
.findFirst()
.orElse(null);
}
@Override
public void start() throws IllegalStateException {
}
@Override
public void destroy() throws IllegalStateException {
}
}