Add ResourceLoaderResourceResolver implementation using Spring's ResourceLoader to resolve Resources.
Resolves gh-92.
This commit is contained in:
John Blum
@@ -0,0 +1,195 @@
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/*
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* Copyright 2020 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
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* or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package org.springframework.geode.core.io.support;
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import java.util.Optional;
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import java.util.concurrent.atomic.AtomicReference;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ResourceLoaderAware;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.core.io.DefaultResourceLoader;
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import org.springframework.core.io.Resource;
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import org.springframework.core.io.ResourceLoader;
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import org.springframework.geode.core.io.ResourceNotFoundException;
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import org.springframework.geode.core.io.ResourceResolver;
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import org.springframework.lang.NonNull;
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import org.springframework.lang.Nullable;
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import org.springframework.util.Assert;
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import org.springframework.util.ClassUtils;
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/**
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* {@link ResourceResolver} implementation using Spring's {@link ResourceLoader} to resolve
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* and load {@link Resource Resources}.
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*
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* @author John Blum
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* @see org.springframework.context.ApplicationContext
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* @see org.springframework.context.ResourceLoaderAware
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* @see org.springframework.core.io.ClassPathResource
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* @see org.springframework.core.io.DefaultResourceLoader
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* @see org.springframework.core.io.Resource
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* @see org.springframework.core.io.ResourceLoader
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* @see org.springframework.geode.core.io.ResourceResolver
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* @since 1.3.1
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*/
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public class ResourceLoaderResourceResolver implements ResourceLoaderAware, ResourceResolver {
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private final AtomicReference<ResourceLoader> resolvedResourceLoader = new AtomicReference<>(null);
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/**
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* Gets a {@link ClassLoader} used by the {@link ResourceLoader} to resolve and load {@link Resource Resources}
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* located on the {@literal classpath}.
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*
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* Returns the {@link ResourceLoader#getClassLoader() ClassLoader} from the configured {@link ResourceLoader},
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* if present. Otherwise, returns a {@link ClassLoader} determined by {@link ClassUtils#getDefaultClassLoader()},
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* which first tries to return the {@link Thread#getContextClassLoader()}, then {@link Class#getClassLoader()},
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* and finally, {@link ClassLoader#getSystemClassLoader()}.
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*
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* @return an {@link Optional} {@link ClassLoader} to resolve and load {@link Resource Resources}.
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* @see java.lang.ClassLoader
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* @see java.util.Optional
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*/
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@Override
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public Optional<ClassLoader> getClassLoader() {
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return Optional.ofNullable(Optional.ofNullable(this.resolvedResourceLoader.get())
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.map(ResourceLoader::getClassLoader)
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.orElseGet(ClassUtils::getDefaultClassLoader));
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}
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/**
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* Configures the {@link ResourceLoader} used by this {@link ResourceResolver} to resolve
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* and load {@link Resource Resources}.
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*
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* @param resourceLoader {@link ResourceLoader} used to resolve and load {@link Resource Resources}.
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* @see org.springframework.core.io.ResourceLoader
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*/
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@Override
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public final void setResourceLoader(@Nullable ResourceLoader resourceLoader) {
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this.resolvedResourceLoader.set(resourceLoader);
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}
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/**
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* Returns a reference to the configured {@link ResourceLoader} used to load {@link Resource Resources}.
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*
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* If a {@link ResourceLoader} was not explicitly configured, then a {@literal default} {@link ResourceLoader}
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* using a {@literal default} {@link ClassLoader} is provided.
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*
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* @return a reference to the configured {@link ResourceLoader}; never {@literal null}.
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* @see org.springframework.core.io.ResourceLoader
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* @see #newResourceLoader()
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*/
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protected @NonNull ResourceLoader getResourceLoader() {
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return this.resolvedResourceLoader.updateAndGet(resourceLoader ->
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resourceLoader != null ? resourceLoader : newResourceLoader());
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}
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/**
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* Constructs a new, {@literal default} instance of {@link ResourceLoader} to load {@link Resource Resources}.
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*
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* Specifically, creates a standalone {@link DefaultResourceLoader} initialized with a {@literal default}
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* {@link ClassLoader} as determined by {@link #getClassLoader()}.
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*
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* @return a new, {@literal default} instance of {@link ResourceLoader}.
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* @see org.springframework.core.io.ResourceLoader
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*/
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protected @NonNull ResourceLoader newResourceLoader() {
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return getClassLoader()
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.map(DefaultResourceLoader::new)
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.orElseGet(DefaultResourceLoader::new);
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}
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/**
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* Constructs a new {@link Resource} handle at the given {@link String location}.
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*
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* By default, a {@link ClassPathResource} is constructed.
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*
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* @param location {@link String location} of the new {@link Resource}; must not be {@literal null}.
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* @return a new {@link Resource} handle at the given {@link String location}.
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* @throws IllegalArgumentException if {@link String location} is not specified.
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* @see org.springframework.core.io.Resource
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*/
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protected @NonNull Resource newResource(@NonNull String location) {
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Assert.hasText(location, () ->
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String.format("The location [%s] of the Resource must be specified", location));
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return new ClassPathResource(location);
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}
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/**
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* Determines whether the {@link Resource} is a {@literal qualified} {@link Resource}.
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*
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* Qualifications are determined by the application Use Case (UC) or Requirements at time of resolution.
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* For example, it maybe that the {@link Resource} must {@link Resource#exists() exist} to be valid, or that
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* the {@link Resource} must be fully-qualified in terms of the protocol, path and name.
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*
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* @param resource {@link Resource} to qualify.
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* @return a boolean value indicating whether the {@link Resource} is qualified (e.g. valid).
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* @see org.springframework.core.io.Resource
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*/
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protected boolean isQualified(@Nullable Resource resource) {
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return resource != null;
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}
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/**
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* Action to carry out in the event the {@link Resource} identified at the given {@link String location} is missing,
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* or not {@link #isQualified(Resource) qualified}.
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*
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* @param resource missing {@link Resource}.
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* @param location {@link String} containing the location identifying the missing {@link Resource}.
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* @throws ResourceNotFoundException if the {@link Resource} cannot be found at the {@link String location}.
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* @return a different {@link Resource}, possibly. Alternatively, this method may throw
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* a {@link ResourceNotFoundException}.
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* @see #isQualified(Resource)
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*/
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protected @Nullable Resource onMissingResource(@Nullable Resource resource, @NonNull String location) {
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throw new ResourceNotFoundException(String.format("Failed to resolve a Resource at location [%s]", location));
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}
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/**
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* Tries to resolve a {@link Resource} at the given {@link String location} using a Spring {@link ResourceLoader},
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* such as a Spring {@link ApplicationContext}.
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*
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* The targeted, identified {@link Resource} can be further {@link #isQualified(Resource) qualified} by subclasses
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* based on application Use Case (UC) or Requirements.
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*
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* In the event that a {@link Resource} cannot be identified at the given {@link String location}, then applications
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* have 1 last opportunity to handle the missing {@link Resource} event, and either return a different or default
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* {@link Resource} or throw a {@link ResourceNotFoundException}.
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*
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* @param location {@link String location} identifying the {@link Resource} to resolve;
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* must not be {@literal null}.
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* @throws IllegalArgumentException if {@link String location} is not specified.
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* @return an {@link Optional} {@link Resource} handle for the given {@link String location}.
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* @see org.springframework.core.io.Resource
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* @see #onMissingResource(Resource, String)
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* @see #isQualified(Resource)
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* @see java.util.Optional
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*/
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@Override
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public Optional<Resource> resolve(@NonNull String location) {
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Assert.hasText(location, () ->
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String.format("The location [%s] of the Resource to resolve must be specified", location));
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Resource resource = getResourceLoader().getResource(location);
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Resource resolvedResource = isQualified(resource) ? resource : onMissingResource(resource, location);
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return Optional.ofNullable(resolvedResource);
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}
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}
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@@ -0,0 +1,368 @@
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/*
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* Copyright 2020 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
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* or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package org.springframework.geode.core.io.support;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.mockito.ArgumentMatchers.any;
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import static org.mockito.ArgumentMatchers.eq;
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import static org.mockito.ArgumentMatchers.isNull;
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import static org.mockito.Mockito.doReturn;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.never;
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import static org.mockito.Mockito.spy;
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import static org.mockito.Mockito.times;
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import static org.mockito.Mockito.verify;
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import static org.mockito.Mockito.verifyNoInteractions;
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import java.util.Set;
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import org.junit.Test;
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import org.apache.shiro.util.CollectionUtils;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.core.io.DefaultResourceLoader;
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import org.springframework.core.io.Resource;
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import org.springframework.core.io.ResourceLoader;
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import org.springframework.geode.core.io.ResourceNotFoundException;
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import org.springframework.util.ClassUtils;
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/**
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* Unit Tests for {@link ResourceLoaderResourceResolver}.
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*
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* @author John Blum
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* @see org.junit.Test
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* @see org.mockito.Mockito
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* @see org.springframework.core.io.ClassPathResource
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* @see org.springframework.core.io.DefaultResourceLoader
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* @see org.springframework.core.io.Resource
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* @see org.springframework.core.io.ResourceLoader
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* @see org.springframework.geode.core.io.support.ResourceLoaderResourceResolver
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* @since 1.3.1
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*/
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public class ResourceLoaderResourceResolverUnitTests {
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@Test
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public void getClassLoaderFromResolvedResourceLoader() {
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ClassLoader mockClassLoader = mock(ClassLoader.class);
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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doReturn(mockClassLoader).when(mockResourceLoader).getClassLoader();
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ResourceLoaderResourceResolver resourceResolver = new ResourceLoaderResourceResolver();
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resourceResolver.setResourceLoader(mockResourceLoader);
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assertThat(resourceResolver.getClassLoader().orElse(null)).isEqualTo(mockClassLoader);
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verify(mockResourceLoader, times(1)).getClassLoader();
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}
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@Test
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public void getsDefaultClassLoader() {
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ResourceLoaderResourceResolver resourceResolver = new ResourceLoaderResourceResolver();
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Set<ClassLoader> classLoaders = CollectionUtils.asSet(
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Thread.currentThread().getContextClassLoader(),
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getClass().getClassLoader(),
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ClassLoader.getSystemClassLoader()
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);
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assertThat(classLoaders).contains(resourceResolver.getClassLoader().orElse(null));
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}
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@Test
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public void setAndGetResourceLoader() {
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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resourceResolver.setResourceLoader(mockResourceLoader);
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assertThat(resourceResolver.getResourceLoader()).isEqualTo(mockResourceLoader);
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verify(resourceResolver, never()).newResourceLoader();
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}
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@Test
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public void getUnresolvedResourceLoaderReturnsNewResourceLoader() {
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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doReturn(mockResourceLoader).when(resourceResolver).newResourceLoader();
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ResourceLoader resourceLoader = resourceResolver.getResourceLoader();
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assertThat(resourceLoader).isEqualTo(mockResourceLoader);
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verify(resourceResolver, times(1)).newResourceLoader();
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}
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@Test
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public void newResourceLoaderReturnsDefaultResourceLoaderWithConfiguredClassLoader() {
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ClassLoader mockClassLoader = mock(ClassLoader.class);
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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doReturn(mockClassLoader).when(mockResourceLoader).getClassLoader();
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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resourceResolver.setResourceLoader(mockResourceLoader);
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ResourceLoader resourceLoader = resourceResolver.newResourceLoader();
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assertThat(resourceLoader).isInstanceOf(DefaultResourceLoader.class);
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assertThat(resourceLoader.getClassLoader()).isEqualTo(mockClassLoader);
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verify(resourceResolver, times(1)).getClassLoader();
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verify(mockResourceLoader, times(1)).getClassLoader();
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}
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@Test
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public void newResourceLoaderReturnsDefaultResourceLoaderWithDefaultClassLoader() {
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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ResourceLoader resourceLoader = resourceResolver.newResourceLoader();
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assertThat(resourceLoader).isInstanceOf(DefaultResourceLoader.class);
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assertThat(resourceLoader.getClassLoader()).isEqualTo(ClassUtils.getDefaultClassLoader());
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verify(resourceResolver, times(1)).getClassLoader();
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}
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@Test
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public void isQualifiedWitNonNullResourceReturnsTrue() {
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Resource mockResource = mock(Resource.class);
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assertThat(new ResourceLoaderResourceResolver().isQualified(mockResource)).isTrue();
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verifyNoInteractions(mockResource);
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}
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@Test
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public void isQualifiedWitNullResourceIsNullSafeReturnsFalse() {
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assertThat(new ResourceLoaderResourceResolver().isQualified(null)).isFalse();
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}
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@Test
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public void newResourceReturnsClassPathResource() {
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ResourceLoaderResourceResolver resourceResolver = new ResourceLoaderResourceResolver();
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Resource resource = resourceResolver.newResource("/path/to/resource");
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assertThat(resource).isInstanceOf(ClassPathResource.class);
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assertThat(resource.getDescription()).containsSequence("path/to/resource");
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}
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private void testNewResourceWithInvalidLocation(String location) {
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try {
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new ResourceLoaderResourceResolver().newResource(location);
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}
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catch (IllegalArgumentException expected) {
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assertThat(expected).hasMessage("The location [%s] of the Resource must be specified", location);
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assertThat(expected).hasNoCause();
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throw expected;
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}
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}
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@Test(expected = IllegalArgumentException.class)
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public void newResourceWithBlankLocation() {
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testNewResourceWithInvalidLocation(" ");
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}
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@Test(expected = IllegalArgumentException.class)
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public void newResourceWithEmptyLocation() {
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testNewResourceWithInvalidLocation("");
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}
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@Test(expected = IllegalArgumentException.class)
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public void newResourceWithNullLocation() {
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testNewResourceWithInvalidLocation(null);
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}
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@Test(expected = ResourceNotFoundException.class)
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public void onMissingResourceThrowsResourceNotFoundException() {
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try {
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new ResourceLoaderResourceResolver().onMissingResource(null, "/path/to/resource");
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}
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catch (ResourceNotFoundException expected) {
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assertThat(expected).hasMessage("Failed to resolve a Resource at location [/path/to/resource]");
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assertThat(expected).hasNoCause();
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throw expected;
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}
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}
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@Test
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public void resolveReturnsResource() {
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String location = "/path/to/resource";
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Resource mockResource = mock(Resource.class);
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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doReturn(mockResourceLoader).when(resourceResolver).getResourceLoader();
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doReturn(mockResource).when(mockResourceLoader).getResource(eq(location));
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assertThat(resourceResolver.resolve(location).orElse(null)).isEqualTo(mockResource);
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verify(resourceResolver, times(1)).getResourceLoader();
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verify(resourceResolver, times(1)).isQualified(eq(mockResource));
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verify(resourceResolver, never()).onMissingResource(any(), any());
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verify(mockResourceLoader, times(1)).getResource(eq(location));
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verifyNoInteractions(mockResource);
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}
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@Test(expected = ResourceNotFoundException.class)
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public void resolveUnresolvableResourceThrowsResourceNotFoundException() {
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String location = "/path/to/resource/a";
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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doReturn(mockResourceLoader).when(resourceResolver).getResourceLoader();
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doReturn(null).when(mockResourceLoader).getResource(any());
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try {
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resourceResolver.resolve(location);
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}
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catch (ResourceNotFoundException expected) {
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assertThat(expected).hasMessage("Failed to resolve a Resource at location [%s]", location);
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assertThat(expected).hasNoCause();
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throw expected;
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}
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finally {
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verify(resourceResolver, times(1)).getResourceLoader();
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verify(resourceResolver, times(1)).isQualified(isNull());
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verify(resourceResolver, times(1)).onMissingResource(isNull(), eq(location));
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verify(mockResourceLoader, times(1)).getResource(eq(location));
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}
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}
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@Test(expected = ResourceNotFoundException.class)
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public void resolveUnqualifiedResourceThrowsResourceNotFoundException() {
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String location = "/path/to/resource/b";
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Resource mockResource = mock(Resource.class);
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ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
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ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
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doReturn(mockResourceLoader).when(resourceResolver).getResourceLoader();
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doReturn(false).when(resourceResolver).isQualified(eq(mockResource));
|
||||
doReturn(mockResource).when(mockResourceLoader).getResource(eq(location));
|
||||
|
||||
try {
|
||||
resourceResolver.resolve(location);
|
||||
}
|
||||
catch (ResourceNotFoundException expected) {
|
||||
|
||||
assertThat(expected).hasMessage("Failed to resolve a Resource at location [%s]", location);
|
||||
assertThat(expected).hasNoCause();
|
||||
|
||||
throw expected;
|
||||
}
|
||||
finally {
|
||||
verify(resourceResolver, times(1)).getResourceLoader();
|
||||
verify(resourceResolver, times(1)).isQualified(eq(mockResource));
|
||||
verify(resourceResolver, times(1)).onMissingResource(eq(mockResource), eq(location));
|
||||
verify(mockResourceLoader, times(1)).getResource(eq(location));
|
||||
verifyNoInteractions(mockResource);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void resolveHandlesMissingResourceByReturningAlternateResource() {
|
||||
|
||||
String location = "/path/to/resource/c";
|
||||
|
||||
Resource mockResourceOne = mock(Resource.class, "one");
|
||||
Resource mockResourceTwo = mock(Resource.class, "two");
|
||||
|
||||
ResourceLoader mockResourceLoader = mock(ResourceLoader.class);
|
||||
|
||||
ResourceLoaderResourceResolver resourceResolver = spy(new ResourceLoaderResourceResolver());
|
||||
|
||||
doReturn(mockResourceLoader).when(resourceResolver).getResourceLoader();
|
||||
doReturn(false).when(resourceResolver).isQualified(mockResourceOne);
|
||||
doReturn(mockResourceTwo).when(resourceResolver).onMissingResource(eq(mockResourceOne), eq(location));
|
||||
doReturn(mockResourceOne).when(mockResourceLoader).getResource(eq(location));
|
||||
|
||||
assertThat(resourceResolver.resolve(location).orElse(null)).isEqualTo(mockResourceTwo);
|
||||
|
||||
verify(resourceResolver, times(1)).getResourceLoader();
|
||||
verify(resourceResolver, times(1)).isQualified(eq(mockResourceOne));
|
||||
verify(resourceResolver, times(1)).onMissingResource(eq(mockResourceOne), eq(location));
|
||||
verify(mockResourceLoader, times(1)).getResource(eq(location));
|
||||
verifyNoInteractions(mockResourceOne, mockResourceTwo);
|
||||
}
|
||||
|
||||
private void testResolveWithInvalidLocation(String location) {
|
||||
|
||||
try {
|
||||
new ResourceLoaderResourceResolver().resolve(location);
|
||||
}
|
||||
catch (IllegalArgumentException expected) {
|
||||
|
||||
assertThat(expected)
|
||||
.hasMessage("The location [%s] of the Resource to resolve must be specified", location);
|
||||
|
||||
assertThat(expected).hasNoCause();
|
||||
|
||||
throw expected;
|
||||
}
|
||||
}
|
||||
|
||||
@Test(expected = IllegalArgumentException.class)
|
||||
public void resolveWithBlankLocationThrowsIllegalArgumentException() {
|
||||
testResolveWithInvalidLocation(" ");
|
||||
}
|
||||
|
||||
@Test(expected = IllegalArgumentException.class)
|
||||
public void resolveWithEmptyLocationThrowsIllegalArgumentException() {
|
||||
testResolveWithInvalidLocation("");
|
||||
}
|
||||
|
||||
@Test(expected = IllegalArgumentException.class)
|
||||
public void resolveWithNullLocationThrowsIllegalArgumentException() {
|
||||
testResolveWithInvalidLocation(null);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user