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- /*
- * Copyright (C) 2011, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.storage.dht;
-
- import static java.util.concurrent.TimeUnit.MILLISECONDS;
-
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Map;
- import java.util.concurrent.Semaphore;
- import java.util.concurrent.atomic.AtomicReference;
- import java.util.concurrent.locks.ReentrantLock;
-
- import org.eclipse.jgit.lib.NullProgressMonitor;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ProgressMonitor;
- import org.eclipse.jgit.lib.ThreadSafeProgressMonitor;
- import org.eclipse.jgit.storage.dht.spi.Context;
- import org.eclipse.jgit.storage.dht.spi.Database;
-
- abstract class BatchObjectLookup<T extends ObjectId> {
- private final RepositoryKey repo;
-
- private final Database db;
-
- private final DhtReader reader;
-
- private final ThreadSafeProgressMonitor progress;
-
- private final Semaphore batches;
-
- private final ReentrantLock resultLock;
-
- private final AtomicReference<DhtException> error;
-
- private final int concurrentBatches;
-
- private final List<T> retry;
-
- private final ArrayList<ObjectInfo> tmp;
-
- private boolean retryMissingObjects;
-
- private boolean cacheLoadedInfo;
-
- BatchObjectLookup(DhtReader reader) {
- this(reader, null);
- }
-
- BatchObjectLookup(DhtReader reader, ProgressMonitor monitor) {
- this.repo = reader.getRepositoryKey();
- this.db = reader.getDatabase();
- this.reader = reader;
-
- if (monitor != null && monitor != NullProgressMonitor.INSTANCE)
- this.progress = new ThreadSafeProgressMonitor(monitor);
- else
- this.progress = null;
-
- this.concurrentBatches = reader.getOptions()
- .getObjectIndexConcurrentBatches();
-
- this.batches = new Semaphore(concurrentBatches);
- this.resultLock = new ReentrantLock();
- this.error = new AtomicReference<DhtException>();
- this.retry = new ArrayList<T>();
- this.tmp = new ArrayList<ObjectInfo>(4);
- }
-
- void setRetryMissingObjects(boolean on) {
- retryMissingObjects = on;
- }
-
- void setCacheLoadedInfo(boolean on) {
- cacheLoadedInfo = on;
- }
-
- void select(Iterable<T> objects) throws IOException {
- selectInBatches(Context.FAST_MISSING_OK, lookInCache(objects));
-
- // Not all of the selection ran with fast options.
- if (retryMissingObjects && !retry.isEmpty()) {
- batches.release(concurrentBatches);
- selectInBatches(Context.READ_REPAIR, retry);
- }
-
- if (progress != null)
- progress.pollForUpdates();
- }
-
- private Iterable<T> lookInCache(Iterable<T> objects) {
- RecentInfoCache infoCache = reader.getRecentInfoCache();
- List<T> missing = null;
- for (T obj : objects) {
- List<ObjectInfo> info = infoCache.get(obj);
- if (info != null) {
- onResult(obj, info);
- if (progress != null)
- progress.update(1);
- } else {
- if (missing == null) {
- if (objects instanceof List<?>)
- missing = new ArrayList<T>(((List<?>) objects).size());
- else
- missing = new ArrayList<T>();
- }
- missing.add(obj);
- }
- }
- if (missing != null)
- return missing;
- return Collections.emptyList();
- }
-
- private void selectInBatches(Context options, Iterable<T> objects)
- throws DhtException {
- final int batchSize = reader.getOptions()
- .getObjectIndexBatchSize();
-
- Map<ObjectIndexKey, T> batch = new HashMap<ObjectIndexKey, T>();
- Iterator<T> otpItr = objects.iterator();
- while (otpItr.hasNext()) {
- T otp = otpItr.next();
-
- batch.put(ObjectIndexKey.create(repo, otp), otp);
-
- if (batch.size() < batchSize && otpItr.hasNext())
- continue;
-
- if (error.get() != null)
- break;
-
- try {
- if (progress != null) {
- while (!batches.tryAcquire(500, MILLISECONDS))
- progress.pollForUpdates();
- progress.pollForUpdates();
- } else {
- batches.acquire();
- }
- } catch (InterruptedException err) {
- error.compareAndSet(null, new DhtTimeoutException(err));
- break;
- }
-
- startQuery(options, batch);
- batch = new HashMap<ObjectIndexKey, T>();
- }
-
- try {
- if (progress != null) {
- while (!batches.tryAcquire(concurrentBatches, 500, MILLISECONDS))
- progress.pollForUpdates();
- progress.pollForUpdates();
- } else {
- batches.acquire(concurrentBatches);
- }
- } catch (InterruptedException err) {
- error.compareAndSet(null, new DhtTimeoutException(err));
- }
-
- if (error.get() != null)
- throw error.get();
-
- // Make sure retry changes are visible to us.
- resultLock.lock();
- resultLock.unlock();
- }
-
- private void startQuery(final Context context,
- final Map<ObjectIndexKey, T> batch) {
- final AsyncCallback<Map<ObjectIndexKey, Collection<ObjectInfo>>> cb;
-
- cb = new AsyncCallback<Map<ObjectIndexKey, Collection<ObjectInfo>>>() {
- public void onSuccess(Map<ObjectIndexKey, Collection<ObjectInfo>> r) {
- resultLock.lock();
- try {
- processResults(context, batch, r);
- } finally {
- resultLock.unlock();
- batches.release();
- }
- }
-
- public void onFailure(DhtException e) {
- error.compareAndSet(null, e);
- batches.release();
- }
- };
- db.objectIndex().get(context, batch.keySet(), cb);
- }
-
- private void processResults(Context context, Map<ObjectIndexKey, T> batch,
- Map<ObjectIndexKey, Collection<ObjectInfo>> objects) {
- for (T obj : batch.values()) {
- Collection<ObjectInfo> matches = objects.get(obj);
-
- if (matches == null || matches.isEmpty()) {
- if (retryMissingObjects && context == Context.FAST_MISSING_OK)
- retry.add(obj);
- continue;
- }
-
- tmp.clear();
- tmp.addAll(matches);
- ObjectInfo.sort(tmp);
- if (cacheLoadedInfo)
- reader.getRecentInfoCache().put(obj, tmp);
-
- onResult(obj, tmp);
- }
-
- if (progress != null)
- progress.update(objects.size());
- }
-
- protected abstract void onResult(T obj, List<ObjectInfo> info);
- }
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