spring Layer 源码
springboot Layer 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/type/Layer.java
/*
* Copyright 2012-2020 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.buildpack.platform.docker.type;
import java.io.IOException;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.springframework.boot.buildpack.platform.io.Content;
import org.springframework.boot.buildpack.platform.io.IOConsumer;
import org.springframework.boot.buildpack.platform.io.InspectedContent;
import org.springframework.boot.buildpack.platform.io.Layout;
import org.springframework.boot.buildpack.platform.io.TarArchive;
import org.springframework.util.Assert;
/**
* A layer that can be written to an {@link ImageArchive}.
*
* @author Phillip Webb
* @since 2.3.0
*/
public class Layer implements Content {
private final Content content;
private final LayerId id;
Layer(TarArchive tarArchive) throws NoSuchAlgorithmException, IOException {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
this.content = InspectedContent.of(tarArchive::writeTo, digest::update);
this.id = LayerId.ofSha256Digest(digest.digest());
}
/**
* Return the ID of the layer.
* @return the layer ID
*/
public LayerId getId() {
return this.id;
}
@Override
public int size() {
return this.content.size();
}
@Override
public void writeTo(OutputStream outputStream) throws IOException {
this.content.writeTo(outputStream);
}
/**
* Factory method to create a new {@link Layer} with a specific {@link Layout}.
* @param layout the layer layout
* @return a new layer instance
* @throws IOException on IO error
*/
public static Layer of(IOConsumer<Layout> layout) throws IOException {
Assert.notNull(layout, "Layout must not be null");
return fromTarArchive(TarArchive.of(layout));
}
/**
* Factory method to create a new {@link Layer} from a {@link TarArchive}.
* @param tarArchive the contents of the layer
* @return a new layer instance
* @throws IOException on error
*/
public static Layer fromTarArchive(TarArchive tarArchive) throws IOException {
Assert.notNull(tarArchive, "TarArchive must not be null");
try {
return new Layer(tarArchive);
}
catch (NoSuchAlgorithmException ex) {
throw new IllegalStateException(ex);
}
}
}
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- 本文标签： Spring Boot Java Spring
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