| /* |
| * 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.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_BLOCK_LIMIT; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_BLOCK_SIZE; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_CONCURRENCY_LEVEL; |
| import static org.eclipse.jgit.lib.ConfigConstants.CONFIG_KEY_STREAM_RATIO; |
| |
| import java.text.MessageFormat; |
| |
| import org.eclipse.jgit.internal.JGitText; |
| import org.eclipse.jgit.lib.Config; |
| |
| /** |
| * Configuration parameters for |
| * {@link org.eclipse.jgit.internal.storage.dfs.DfsBlockCache}. |
| */ |
| public class DfsBlockCacheConfig { |
| /** 1024 (number of bytes in one kibibyte/kilobyte) */ |
| public static final int KB = 1024; |
| |
| /** 1024 {@link #KB} (number of bytes in one mebibyte/megabyte) */ |
| public static final int MB = 1024 * KB; |
| |
| private long blockLimit; |
| private int blockSize; |
| private double streamRatio; |
| private int concurrencyLevel; |
| |
| /** |
| * Create a default configuration. |
| */ |
| public DfsBlockCacheConfig() { |
| setBlockLimit(32 * MB); |
| setBlockSize(64 * KB); |
| setStreamRatio(0.30); |
| setConcurrencyLevel(32); |
| } |
| |
| /** |
| * Get maximum number bytes of heap memory to dedicate to caching pack file |
| * data. |
| * |
| * @return maximum number bytes of heap memory to dedicate to caching pack |
| * file data. <b>Default is 32 MB.</b> |
| */ |
| public long getBlockLimit() { |
| return blockLimit; |
| } |
| |
| /** |
| * Set maximum number bytes of heap memory to dedicate to caching pack file |
| * data. |
| * <p> |
| * It is strongly recommended to set the block limit to be an integer multiple |
| * of the block size. This constraint is not enforced by this method (since |
| * it may be called before {@link #setBlockSize(int)}), but it is enforced by |
| * {@link #fromConfig(Config)}. |
| * |
| * @param newLimit |
| * maximum number bytes of heap memory to dedicate to caching |
| * pack file data; must be positive. |
| * @return {@code this} |
| */ |
| public DfsBlockCacheConfig setBlockLimit(long newLimit) { |
| if (newLimit <= 0) { |
| throw new IllegalArgumentException(MessageFormat.format( |
| JGitText.get().blockLimitNotPositive, |
| Long.valueOf(newLimit))); |
| } |
| blockLimit = newLimit; |
| return this; |
| } |
| |
| /** |
| * Get size in bytes of a single window mapped or read in from the pack |
| * file. |
| * |
| * @return size in bytes of a single window mapped or read in from the pack |
| * file. <b>Default is 64 KB.</b> |
| */ |
| public int getBlockSize() { |
| return blockSize; |
| } |
| |
| /** |
| * Set size in bytes of a single window read in from the pack file. |
| * |
| * @param newSize |
| * size in bytes of a single window read in from the pack file. |
| * The value must be a power of 2. |
| * @return {@code this} |
| */ |
| public DfsBlockCacheConfig setBlockSize(int newSize) { |
| int size = Math.max(512, newSize); |
| if ((size & (size - 1)) != 0) { |
| throw new IllegalArgumentException( |
| JGitText.get().blockSizeNotPowerOf2); |
| } |
| blockSize = size; |
| return this; |
| } |
| |
| /** |
| * Get the estimated number of threads concurrently accessing the cache. |
| * |
| * @return the estimated number of threads concurrently accessing the cache. |
| * <b>Default is 32.</b> |
| */ |
| public int getConcurrencyLevel() { |
| return concurrencyLevel; |
| } |
| |
| /** |
| * Set the estimated number of threads concurrently accessing the cache. |
| * |
| * @param newConcurrencyLevel |
| * the estimated number of threads concurrently accessing the |
| * cache. |
| * @return {@code this} |
| */ |
| public DfsBlockCacheConfig setConcurrencyLevel( |
| final int newConcurrencyLevel) { |
| concurrencyLevel = newConcurrencyLevel; |
| return this; |
| } |
| |
| /** |
| * Get highest percentage of {@link #getBlockLimit()} a single pack can |
| * occupy while being copied by the pack reuse strategy. |
| * |
| * @return highest percentage of {@link #getBlockLimit()} a single pack can |
| * occupy while being copied by the pack reuse strategy. <b>Default |
| * is 0.30, or 30%</b>. |
| */ |
| public double getStreamRatio() { |
| return streamRatio; |
| } |
| |
| /** |
| * Set percentage of cache to occupy with a copied pack. |
| * |
| * @param ratio |
| * percentage of cache to occupy with a copied pack. |
| * @return {@code this} |
| */ |
| public DfsBlockCacheConfig setStreamRatio(double ratio) { |
| streamRatio = Math.max(0, Math.min(ratio, 1.0)); |
| 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. |
| * <p> |
| * Enforces certain constraints on the combination of settings in the config, |
| * for example that the block limit is a multiple of the block size. |
| * |
| * @param rc |
| * configuration to read properties from. |
| * @return {@code this} |
| */ |
| public DfsBlockCacheConfig fromConfig(Config rc) { |
| long cfgBlockLimit = rc.getLong( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_BLOCK_LIMIT, |
| getBlockLimit()); |
| int cfgBlockSize = rc.getInt( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_BLOCK_SIZE, |
| getBlockSize()); |
| if (cfgBlockLimit % cfgBlockSize != 0) { |
| throw new IllegalArgumentException(MessageFormat.format( |
| JGitText.get().blockLimitNotMultipleOfBlockSize, |
| Long.valueOf(cfgBlockLimit), |
| Long.valueOf(cfgBlockSize))); |
| } |
| |
| setBlockLimit(cfgBlockLimit); |
| setBlockSize(cfgBlockSize); |
| |
| setConcurrencyLevel(rc.getInt( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_CONCURRENCY_LEVEL, |
| getConcurrencyLevel())); |
| |
| String v = rc.getString( |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_STREAM_RATIO); |
| if (v != null) { |
| try { |
| setStreamRatio(Double.parseDouble(v)); |
| } catch (NumberFormatException e) { |
| throw new IllegalArgumentException(MessageFormat.format( |
| JGitText.get().enumValueNotSupported3, |
| CONFIG_CORE_SECTION, |
| CONFIG_DFS_SECTION, |
| CONFIG_KEY_STREAM_RATIO, v)); |
| } |
| } |
| return this; |
| } |
| } |