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https://issues.apache.org/jira/browse/MRESOLVER-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611759#comment-17611759
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ASF GitHub Bot commented on MRESOLVER-269:
------------------------------------------
cstamas commented on code in PR #199:
URL: https://github.com/apache/maven-resolver/pull/199#discussion_r984942284
##########
maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/checksum/CompactFileTrustedChecksumsSource.java:
##########
@@ -0,0 +1,172 @@
+package org.eclipse.aether.internal.impl.checksum;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.repository.ArtifactRepository;
+import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
+import org.eclipse.aether.util.artifact.ArtifactIdUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Compact file {@link FileTrustedChecksumsSourceSupport} implementation that
use specified directory as base
+ * directory, where it expects a "summary" file named as
"checksums.${checksumExt}" for each checksum algorithm, and
+ * file format is artifact ID and checksum separated by space per line. The
format supports comments "#" (hash) and
+ * empty lines (both are ignored).
+ * <p>
+ * The source may be configured to be "origin aware", in that case it will
factor in origin repository ID as well into
+ * file name (for example "central-checksums.sha1").
+ * <p>
+ * The checksums file once loaded are cached in session, so in-flight file
changes during lifecycle of session are NOT
+ * noticed.
+ * <p>
+ * The name of this implementation is "file-compact".
+ *
+ * @see ArtifactIdUtils#toId(Artifact)
+ * @since TBD
+ */
+@Singleton
+@Named( CompactFileTrustedChecksumsSource.NAME )
+public final class CompactFileTrustedChecksumsSource
+ extends FileTrustedChecksumsSourceSupport
+{
Review Comment:
made it `checksums-central.sha1`
> Allow more compact storage of provided checksums
> ------------------------------------------------
>
> Key: MRESOLVER-269
> URL: https://issues.apache.org/jira/browse/MRESOLVER-269
> Project: Maven Resolver
> Issue Type: Improvement
> Components: Resolver
> Reporter: Rafael Winterhalter
> Assignee: Tamás Cservenák
> Priority: Major
> Fix For: resolver-next
>
>
> While the repository layout makes sense for storage outside of a project, it
> would be more convenient to store checksums in a single file (per algorithm)
> when keeping checksums along when storing these checksums within a project.
> This makes the storage easier to version control and avoids the overhead of
> storing a lot of files in version control what often creates some overhead.
> Ideally, Maven could support such files out of the box by shipping a provider
> for such files.
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