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Reduce JGit memory use #82 #151

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Jun 18, 2025
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Reduce JGit memory use #82 #151

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50 changes: 0 additions & 50 deletions change-proneness-ranker/src/main/java/org/hjug/git/GitLogReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -48,61 +48,11 @@ public void close() throws Exception {
git.close();
}

// Based on
// https://github.com/Cosium/git-code-format-maven-plugin/blob/master/src/main/java/com/cosium/code/format/AbstractMavenGitCodeFormatMojo.java
// MIT License
// Move to a provider?
public Repository gitRepository(File basedir) throws IOException {
Repository gitRepository;
FileRepositoryBuilder repositoryBuilder = new FileRepositoryBuilder().findGitDir(basedir);
String gitIndexFileEnvVariable = System.getenv("GIT_INDEX_FILE");
if (Objects.nonNull(gitIndexFileEnvVariable)
&& !gitIndexFileEnvVariable.trim().isEmpty()) {
log.debug("Setting Index File based on Env Variable GIT_INDEX_FILE {}", gitIndexFileEnvVariable);
repositoryBuilder = repositoryBuilder.setIndexFile(new File(gitIndexFileEnvVariable));
}
gitRepository = repositoryBuilder.build();

return gitRepository;
}

public File getGitDir(File basedir) {
FileRepositoryBuilder repositoryBuilder = new FileRepositoryBuilder().findGitDir(basedir);
return repositoryBuilder.getGitDir();
}

// https://stackoverflow.com/a/19950970/346247
// and
// https://github.com/centic9/jgit-cookbook/blob/master/src/main/java/org/dstadler/jgit/api/ReadFileFromCommit.java
public Map<String, ByteArrayOutputStream> listRepositoryContentsAtHEAD(Repository repository) throws IOException {
Ref head = repository.exactRef("HEAD");
// a RevWalk allows us to walk over commits based on some filtering that is defined
RevWalk walk = new RevWalk(repository);
RevCommit commit = walk.parseCommit(head.getObjectId());
RevTree tree = commit.getTree();

TreeWalk treeWalk = new TreeWalk(repository);
treeWalk.addTree(tree);
treeWalk.setRecursive(false);

// TODO: extract rest of this method to test it
Map<String, ByteArrayOutputStream> fileContentsCollection = new HashMap<>();
while (treeWalk.next()) {
if (treeWalk.isSubtree()) {
treeWalk.enterSubtree();
} else {
if (treeWalk.getPathString().endsWith(JAVA_FILE_TYPE)) {
ObjectId objectId = treeWalk.getObjectId(0);
ObjectLoader loader = repository.open(objectId);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
loader.copyTo(outputStream);
fileContentsCollection.put(treeWalk.getPathString(), outputStream);
}
}
}
return fileContentsCollection;
}

// log --follow implementation may be worth adopting in the future
// https://github.com/spearce/jgit/blob/master/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/RevWalkTextBuiltin.java

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