jetbrains.buildServer.buildTriggers.vcs.git.CommitLoaderImpl.java Source code

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Here is the source code for jetbrains.buildServer.buildTriggers.vcs.git.CommitLoaderImpl.java

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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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
 *
 * 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.
 */

package jetbrains.buildServer.buildTriggers.vcs.git;

import com.intellij.openapi.diagnostic.Logger;
import jetbrains.buildServer.vcs.VcsException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.RefSpec;
import org.eclipse.jgit.transport.URIish;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;

import static java.util.Arrays.asList;

public class CommitLoaderImpl implements CommitLoader {

    private static final Logger LOG = Logger.getInstance(CommitLoaderImpl.class.getName());
    private static final Logger PERFORMANCE_LOG = Logger
            .getInstance(CommitLoaderImpl.class.getName() + ".Performance");

    private final RepositoryManager myRepositoryManager;
    private final FetchCommand myFetchCommand;
    private final GitMapFullPath myMapFullPath;

    public CommitLoaderImpl(@NotNull RepositoryManager repositoryManager, @NotNull FetchCommand fetchCommand,
            @NotNull GitMapFullPath mapFullPath) {
        myRepositoryManager = repositoryManager;
        myFetchCommand = fetchCommand;
        myMapFullPath = mapFullPath;
        myMapFullPath.setCommitLoader(this);
    }

    @NotNull
    public RevCommit loadCommit(@NotNull OperationContext context, @NotNull GitVcsRoot root,
            @NotNull String revision) throws VcsException, IOException {
        String commitSHA = GitUtils.versionRevision(revision);
        Repository db = context.getRepository(root);
        ObjectId commitId = ObjectId.fromString(commitSHA);
        try {
            return getCommit(db, commitId);
        } catch (IOException ex) {
            //ignore error, will try to fetch
        }

        LOG.debug("Cannot find commit " + commitSHA + " in repository " + root.debugInfo() + ", fetch branch "
                + root.getRef());
        fetchBranchData(root, db);

        try {
            return getCommit(db, commitId);
        } catch (IOException e) {
            LOG.debug("Cannot find commit " + commitSHA + " in the branch " + root.getRef() + " of repository "
                    + root.debugInfo() + ", fetch all branches");
            RefSpec spec = new RefSpec().setSourceDestination("refs/*", "refs/*").setForceUpdate(true);
            fetch(db, root.getRepositoryFetchURL(), asList(spec), new FetchSettings(root.getAuthSettings()));
            try {
                return getCommit(db, commitId);
            } catch (IOException e1) {
                throw new VcsException("Cannot find commit " + commitSHA + " in repository " + root.debugInfo());
            }
        }
    }

    public void fetch(@NotNull Repository db, @NotNull URIish fetchURI, @NotNull Collection<RefSpec> refspecs,
            @NotNull FetchSettings settings) throws IOException, VcsException {
        File repositoryDir = db.getDirectory();
        assert repositoryDir != null : "Non-local repository";
        Lock rmLock = myRepositoryManager.getRmLock(repositoryDir).readLock();
        rmLock.lock();
        try {
            final long start = System.currentTimeMillis();
            synchronized (myRepositoryManager.getWriteLock(repositoryDir)) {
                final long finish = System.currentTimeMillis();
                Map<String, Ref> oldRefs = new HashMap<String, Ref>(db.getAllRefs());
                PERFORMANCE_LOG.debug("[waitForWriteLock] repository: " + repositoryDir.getAbsolutePath()
                        + ", took " + (finish - start) + "ms");
                myFetchCommand.fetch(db, fetchURI, refspecs, settings);
                Map<String, Ref> newRefs = new HashMap<String, Ref>(db.getAllRefs());
                myMapFullPath.invalidateRevisionsCache(db, oldRefs, newRefs);
            }
        } finally {
            rmLock.unlock();
        }
    }

    @NotNull
    public RevCommit getCommit(@NotNull Repository repository, @NotNull ObjectId commitId) throws IOException {
        final long start = System.currentTimeMillis();
        RevWalk walk = new RevWalk(repository);
        try {
            return walk.parseCommit(commitId);
        } finally {
            walk.release();
            final long finish = System.currentTimeMillis();
            if (PERFORMANCE_LOG.isDebugEnabled()) {
                PERFORMANCE_LOG
                        .debug("[RevWalk.parseCommit] repository=" + repository.getDirectory().getAbsolutePath()
                                + ", commit=" + commitId.name() + ", took: " + (finish - start) + "ms");
            }
        }
    }

    @Nullable
    public RevCommit findCommit(@NotNull Repository r, @NotNull String sha) {
        try {
            return getCommit(r, ObjectId.fromString(sha));
        } catch (Exception e) {
            return null;
        }
    }

    private void fetchBranchData(@NotNull GitVcsRoot root, @NotNull Repository repository)
            throws VcsException, IOException {
        final String refName = GitUtils.expandRef(root.getRef());
        RefSpec spec = new RefSpec().setSource(refName).setDestination(refName).setForceUpdate(true);
        fetch(repository, root.getRepositoryFetchURL(), asList(spec), new FetchSettings(root.getAuthSettings()));
    }
}