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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.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 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);
}
/**
* @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;
}
/**
* @param newLimit
* maximum number bytes of heap memory to dedicate to caching
* pack file data.
* @return {@code this}
*/
public DfsBlockCacheConfig setBlockLimit(final long newLimit) {
blockLimit = newLimit;
return this;
}
/**
* @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;
}
/**
* @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(final int newSize) {
int size = Math.max(512, newSize);
if ((size & (size - 1)) != 0) {
throw new IllegalArgumentException(
JGitText.get().blockSizeNotPowerOf2);
}
blockSize = size;
return this;
}
/**
* @return the estimated number of threads concurrently accessing the cache.
* <b>Default is 32.</b>
*/
public int getConcurrencyLevel() {
return concurrencyLevel;
}
/**
* @param newConcurrencyLevel
* the estimated number of threads concurrently accessing the
* cache.
* @return {@code this}
*/
public DfsBlockCacheConfig setConcurrencyLevel(
final int newConcurrencyLevel) {
concurrencyLevel = newConcurrencyLevel;
return this;
}
/**
* @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;
}
/**
* @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.
*
* @param rc
* configuration to read properties from.
* @return {@code this}
*/
public DfsBlockCacheConfig fromConfig(final Config rc) {
setBlockLimit(rc.getLong(
CONFIG_CORE_SECTION,
CONFIG_DFS_SECTION,
CONFIG_KEY_BLOCK_LIMIT,
getBlockLimit()));
setBlockSize(rc.getInt(
CONFIG_CORE_SECTION,
CONFIG_DFS_SECTION,
CONFIG_KEY_BLOCK_SIZE,
getBlockSize()));
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;
}
}
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