Phillip Webb
2 years ago
commit
7db93aeb90
@ -0,0 +1,78 @@
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/*
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* Copyright 2012-2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot;
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import java.util.function.BiFunction;
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import java.util.function.Supplier;
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import org.springframework.aot.AotDetector;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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import org.springframework.context.support.GenericApplicationContext;
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import org.springframework.core.env.ConfigurableEnvironment;
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import org.springframework.core.io.support.SpringFactoriesLoader;
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/**
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* Default {@link ApplicationContextFactory} implementation that will create an
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* appropriate context for the {@link WebApplicationType}.
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*
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* @author Phillip Webb
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*/
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class DefaultApplicationContextFactory implements ApplicationContextFactory {
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@Override
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public Class<? extends ConfigurableEnvironment> getEnvironmentType(WebApplicationType webApplicationType) {
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return getFromSpringFactories(webApplicationType, ApplicationContextFactory::getEnvironmentType, null);
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}
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@Override
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public ConfigurableEnvironment createEnvironment(WebApplicationType webApplicationType) {
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return getFromSpringFactories(webApplicationType, ApplicationContextFactory::createEnvironment, null);
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}
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@Override
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public ConfigurableApplicationContext create(WebApplicationType webApplicationType) {
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try {
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return getFromSpringFactories(webApplicationType, ApplicationContextFactory::create,
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this::createDefaultApplicationContext);
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}
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catch (Exception ex) {
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throw new IllegalStateException("Unable create a default ApplicationContext instance, "
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+ "you may need a custom ApplicationContextFactory", ex);
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}
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}
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private ConfigurableApplicationContext createDefaultApplicationContext() {
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if (!AotDetector.useGeneratedArtifacts()) {
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return new AnnotationConfigApplicationContext();
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}
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return new GenericApplicationContext();
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}
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private <T> T getFromSpringFactories(WebApplicationType webApplicationType,
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BiFunction<ApplicationContextFactory, WebApplicationType, T> action, Supplier<T> defaultResult) {
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for (ApplicationContextFactory candidate : SpringFactoriesLoader.loadFactories(ApplicationContextFactory.class,
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getClass().getClassLoader())) {
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T result = action.apply(candidate, webApplicationType);
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if (result != null) {
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return result;
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}
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}
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return (defaultResult != null) ? defaultResult.get() : null;
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}
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}
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