com.google.gerrit.server.patch.PatchListCacheImpl.java Source code

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Here is the source code for com.google.gerrit.server.patch.PatchListCacheImpl.java

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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.server.patch;

import com.google.common.cache.Cache;
import com.google.gerrit.reviewdb.client.AccountDiffPreference.Whitespace;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

import org.eclipse.jgit.errors.LargeObjectException;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectId;

import java.util.concurrent.ExecutionException;

/** Provides a cached list of {@link PatchListEntry}. */
@Singleton
public class PatchListCacheImpl implements PatchListCache {
    static final String FILE_NAME = "diff";
    static final String INTRA_NAME = "diff_intraline";

    public static Module module() {
        return new CacheModule() {
            @Override
            protected void configure() {
                factory(PatchListLoader.Factory.class);
                persist(FILE_NAME, PatchListKey.class, PatchList.class).maximumWeight(10 << 20)
                        .weigher(PatchListWeigher.class);

                factory(IntraLineLoader.Factory.class);
                persist(INTRA_NAME, IntraLineDiffKey.class, IntraLineDiff.class).maximumWeight(10 << 20)
                        .weigher(IntraLineWeigher.class);

                bind(PatchListCacheImpl.class);
                bind(PatchListCache.class).to(PatchListCacheImpl.class);
            }
        };
    }

    private final Cache<PatchListKey, PatchList> fileCache;
    private final Cache<IntraLineDiffKey, IntraLineDiff> intraCache;
    private final PatchListLoader.Factory fileLoaderFactory;
    private final IntraLineLoader.Factory intraLoaderFactory;
    private final boolean computeIntraline;

    @Inject
    PatchListCacheImpl(@Named(FILE_NAME) Cache<PatchListKey, PatchList> fileCache,
            @Named(INTRA_NAME) Cache<IntraLineDiffKey, IntraLineDiff> intraCache,
            PatchListLoader.Factory fileLoaderFactory, IntraLineLoader.Factory intraLoaderFactory,
            @GerritServerConfig Config cfg) {
        this.fileCache = fileCache;
        this.intraCache = intraCache;
        this.fileLoaderFactory = fileLoaderFactory;
        this.intraLoaderFactory = intraLoaderFactory;

        this.computeIntraline = cfg.getBoolean("cache", INTRA_NAME, "enabled",
                cfg.getBoolean("cache", "diff", "intraline", true));
    }

    @Override
    public PatchList get(PatchListKey key, Project.NameKey project) throws PatchListNotAvailableException {
        try {
            return fileCache.get(key, fileLoaderFactory.create(key, project));
        } catch (ExecutionException | LargeObjectException e) {
            PatchListLoader.log.warn("Error computing " + key, e);
            throw new PatchListNotAvailableException(e.getCause());
        }
    }

    @Override
    public PatchList get(Change change, PatchSet patchSet) throws PatchListNotAvailableException {
        Project.NameKey project = change.getProject();
        ObjectId a = null;
        if (patchSet.getRevision() == null) {
            throw new PatchListNotAvailableException("revision is null for " + patchSet.getId());
        }
        ObjectId b = ObjectId.fromString(patchSet.getRevision().get());
        Whitespace ws = Whitespace.IGNORE_NONE;
        return get(new PatchListKey(a, b, ws), project);
    }

    @Override
    public IntraLineDiff getIntraLineDiff(IntraLineDiffKey key, IntraLineDiffArgs args) {
        if (computeIntraline) {
            try {
                return intraCache.get(key, intraLoaderFactory.create(key, args));
            } catch (ExecutionException | LargeObjectException e) {
                IntraLineLoader.log.warn("Error computing " + key, e);
                return new IntraLineDiff(IntraLineDiff.Status.ERROR);
            }
        } else {
            return new IntraLineDiff(IntraLineDiff.Status.DISABLED);
        }
    }
}