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buildSrc/src/main/java/org/springframework/boot/build/docs/ApplicationRunner.java
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| /* | ||
| * Copyright 2012-2022 the original author or authors. | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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.springframework.boot.build.docs; | ||
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|
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
|
|
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| import org.gradle.api.DefaultTask; | ||
| import org.gradle.api.Task; | ||
| import org.gradle.api.file.FileCollection; | ||
| import org.gradle.api.file.RegularFileProperty; | ||
| import org.gradle.api.provider.ListProperty; | ||
| import org.gradle.api.provider.Property; | ||
| import org.gradle.api.tasks.Classpath; | ||
| import org.gradle.api.tasks.Input; | ||
| import org.gradle.api.tasks.OutputFile; | ||
| import org.gradle.api.tasks.TaskAction; | ||
| import org.gradle.internal.jvm.Jvm; | ||
|
|
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| /** | ||
| * {@link Task} to run an application for the purpose of capturing its output for | ||
| * inclusion in the reference documentation. | ||
| * | ||
| * @author Andy Wilkinson | ||
| */ | ||
| public class ApplicationRunner extends DefaultTask { | ||
|
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| private final RegularFileProperty output = getProject().getObjects().fileProperty(); | ||
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| private final ListProperty<String> args = getProject().getObjects().listProperty(String.class); | ||
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| private final Property<String> mainClass = getProject().getObjects().property(String.class); | ||
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| private final Property<String> expectedLogging = getProject().getObjects().property(String.class); | ||
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| private FileCollection classpath; | ||
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| @OutputFile | ||
| public RegularFileProperty getOutput() { | ||
| return this.output; | ||
| } | ||
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| @Classpath | ||
| public FileCollection getClasspath() { | ||
| return this.classpath; | ||
| } | ||
|
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| public void setClasspath(FileCollection classpath) { | ||
| this.classpath = classpath; | ||
| } | ||
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| @Input | ||
| public ListProperty<String> getArgs() { | ||
| return this.args; | ||
| } | ||
|
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| @Input | ||
| public Property<String> getMainClass() { | ||
| return this.mainClass; | ||
| } | ||
|
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| @Input | ||
| public Property<String> getExpectedLogging() { | ||
| return this.expectedLogging; | ||
| } | ||
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| @TaskAction | ||
| void runApplication() throws IOException { | ||
| List<String> command = new ArrayList<>(); | ||
| File executable = Jvm.current().getExecutable("java"); | ||
| command.add(executable.getAbsolutePath()); | ||
| command.add("-cp"); | ||
| command.add(this.classpath.getFiles().stream().map(File::getAbsolutePath) | ||
| .collect(Collectors.joining(File.pathSeparator))); | ||
| command.add(this.mainClass.get()); | ||
| command.addAll(this.args.get()); | ||
| File outputFile = this.output.getAsFile().get(); | ||
| Process process = new ProcessBuilder().redirectOutput(outputFile).redirectError(outputFile).command(command) | ||
| .start(); | ||
| awaitLogging(process); | ||
| process.destroy(); | ||
| } | ||
|
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| private void awaitLogging(Process process) { | ||
| long end = System.currentTimeMillis() + 30000; | ||
| String expectedLogging = this.expectedLogging.get(); | ||
| while (System.currentTimeMillis() < end) { | ||
| for (String line : outputLines()) { | ||
| if (line.contains(expectedLogging)) { | ||
| return; | ||
| } | ||
| } | ||
| if (!process.isAlive()) { | ||
| throw new IllegalStateException("Process exited before '" + expectedLogging + "' was logged"); | ||
| } | ||
| } | ||
| throw new IllegalStateException("'" + expectedLogging + "' was not logged within 30 seconds"); | ||
| } | ||
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| private List<String> outputLines() { | ||
| Path outputPath = this.output.get().getAsFile().toPath(); | ||
| try { | ||
| return Files.readAllLines(outputPath); | ||
| } | ||
| catch (IOException ex) { | ||
| throw new RuntimeException("Failed to read lines of output from '" + outputPath + "'", ex); | ||
| } | ||
| } | ||
|
|
||
| } |
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