spring ExitCodeGenerators 源码
springboot ExitCodeGenerators 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ExitCodeGenerators.java
/*
* 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;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.core.annotation.Order;
import org.springframework.util.Assert;
/**
* Maintains an ordered collection of {@link ExitCodeGenerator} instances and allows the
* final exit code to be calculated. Generators are ordered by {@link Order @Order} and
* {@link Ordered}.
*
* @author Dave Syer
* @author Phillip Webb
* @author GenKui Du
* @see #getExitCode()
* @see ExitCodeGenerator
*/
class ExitCodeGenerators implements Iterable<ExitCodeGenerator> {
private List<ExitCodeGenerator> generators = new ArrayList<>();
void addAll(Throwable exception, ExitCodeExceptionMapper... mappers) {
Assert.notNull(exception, "Exception must not be null");
Assert.notNull(mappers, "Mappers must not be null");
addAll(exception, Arrays.asList(mappers));
}
void addAll(Throwable exception, Iterable<? extends ExitCodeExceptionMapper> mappers) {
Assert.notNull(exception, "Exception must not be null");
Assert.notNull(mappers, "Mappers must not be null");
for (ExitCodeExceptionMapper mapper : mappers) {
add(exception, mapper);
}
}
void add(Throwable exception, ExitCodeExceptionMapper mapper) {
Assert.notNull(exception, "Exception must not be null");
Assert.notNull(mapper, "Mapper must not be null");
add(new MappedExitCodeGenerator(exception, mapper));
}
void addAll(ExitCodeGenerator... generators) {
Assert.notNull(generators, "Generators must not be null");
addAll(Arrays.asList(generators));
}
void addAll(Iterable<? extends ExitCodeGenerator> generators) {
Assert.notNull(generators, "Generators must not be null");
for (ExitCodeGenerator generator : generators) {
add(generator);
}
}
void add(ExitCodeGenerator generator) {
Assert.notNull(generator, "Generator must not be null");
this.generators.add(generator);
AnnotationAwareOrderComparator.sort(this.generators);
}
@Override
public Iterator<ExitCodeGenerator> iterator() {
return this.generators.iterator();
}
/**
* Get the final exit code that should be returned. The final exit code is the first
* non-zero exit code that is {@link ExitCodeGenerator#getExitCode generated}.
* @return the final exit code.
*/
int getExitCode() {
int exitCode = 0;
for (ExitCodeGenerator generator : this.generators) {
try {
int value = generator.getExitCode();
if (value != 0) {
exitCode = value;
break;
}
}
catch (Exception ex) {
exitCode = 1;
ex.printStackTrace();
}
}
return exitCode;
}
/**
* Adapts an {@link ExitCodeExceptionMapper} to an {@link ExitCodeGenerator}.
*/
private static class MappedExitCodeGenerator implements ExitCodeGenerator {
private final Throwable exception;
private final ExitCodeExceptionMapper mapper;
MappedExitCodeGenerator(Throwable exception, ExitCodeExceptionMapper mapper) {
this.exception = exception;
this.mapper = mapper;
}
@Override
public int getExitCode() {
return this.mapper.getExitCode(this.exception);
}
}
}
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