| /* |
| * Copyright (C) 2011, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.internal.storage.dfs; |
| |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_CORE_SECTION; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_DFS_SECTION; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_DELTA_BASE_CACHE_LIMIT; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_STREAM_BUFFER; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_STREAM_FILE_TRESHOLD; |
| |
| import org.eclipse.jgit.lib.Config; |
| import org.eclipse.jgit.storage.pack.PackConfig; |
| |
| /** |
| * Options controlling how objects are read from a DFS stored repository. |
| */ |
| public class DfsReaderOptions { |
| /** 1024 (number of bytes in one kibibyte/kilobyte) */ |
| public static final int KiB = 1024; |
| |
| /** 1024 {@link #KiB} (number of bytes in one mebibyte/megabyte) */ |
| public static final int MiB = 1024 * KiB; |
| |
| private int deltaBaseCacheLimit; |
| private int streamFileThreshold; |
| |
| private int streamPackBufferSize; |
| |
| /** |
| * Create a default reader configuration. |
| */ |
| public DfsReaderOptions() { |
| setDeltaBaseCacheLimit(10 * MiB); |
| setStreamFileThreshold(PackConfig.DEFAULT_BIG_FILE_THRESHOLD); |
| } |
| |
| /** |
| * Get maximum number of bytes to hold in per-reader DeltaBaseCache. |
| * |
| * @return maximum number of bytes to hold in per-reader DeltaBaseCache. |
| */ |
| public int getDeltaBaseCacheLimit() { |
| return deltaBaseCacheLimit; |
| } |
| |
| /** |
| * Set the maximum number of bytes in the DeltaBaseCache. |
| * |
| * @param maxBytes |
| * the new limit. |
| * @return {@code this} |
| */ |
| public DfsReaderOptions setDeltaBaseCacheLimit(int maxBytes) { |
| deltaBaseCacheLimit = Math.max(0, maxBytes); |
| return this; |
| } |
| |
| /** |
| * Get the size threshold beyond which objects must be streamed. |
| * |
| * @return the size threshold beyond which objects must be streamed. |
| */ |
| public int getStreamFileThreshold() { |
| return streamFileThreshold; |
| } |
| |
| /** |
| * Set new byte limit for objects that must be streamed. |
| * |
| * @param newLimit |
| * new byte limit for objects that must be streamed. Objects |
| * smaller than this size can be obtained as a contiguous byte |
| * array, while objects bigger than this size require using an |
| * {@link org.eclipse.jgit.lib.ObjectStream}. |
| * @return {@code this} |
| */ |
| public DfsReaderOptions setStreamFileThreshold(int newLimit) { |
| streamFileThreshold = Math.max(0, newLimit); |
| return this; |
| } |
| |
| /** |
| * Get number of bytes to use for buffering when streaming a pack file |
| * during copying. |
| * |
| * @return number of bytes to use for buffering when streaming a pack file |
| * during copying. If 0 the block size of the pack is used. |
| */ |
| public int getStreamPackBufferSize() { |
| return streamPackBufferSize; |
| } |
| |
| /** |
| * Set new buffer size in bytes for buffers used when streaming pack files |
| * during copying. |
| * |
| * @param bufsz |
| * new buffer size in bytes for buffers used when streaming pack |
| * files during copying. |
| * @return {@code this} |
| */ |
| public DfsReaderOptions setStreamPackBufferSize(int bufsz) { |
| streamPackBufferSize = Math.max(0, bufsz); |
| return this; |
| } |
| |
| /** |
| * Update properties by setting fields from the configuration. |
| * <p> |
| * If a property is not defined in the configuration, then it is left |
| * unmodified. |
| * |
| * @param rc |
| * configuration to read properties from. |
| * @return {@code this} |
| */ |
| public DfsReaderOptions fromConfig(Config rc) { |
| setDeltaBaseCacheLimit(rc.getInt( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_DELTA_BASE_CACHE_LIMIT, |
| getDeltaBaseCacheLimit())); |
| |
| long maxMem = Runtime.getRuntime().maxMemory(); |
| long sft = rc.getLong( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_STREAM_FILE_TRESHOLD, |
| getStreamFileThreshold()); |
| sft = Math.min(sft, maxMem / 4); // don't use more than 1/4 of the heap |
| sft = Math.min(sft, Integer.MAX_VALUE); // cannot exceed array length |
| setStreamFileThreshold((int) sft); |
| |
| setStreamPackBufferSize(rc.getInt( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_STREAM_BUFFER, |
| getStreamPackBufferSize())); |
| return this; |
| } |
| } |