2e1cb2b849
Instead of using Ehcache for in-memory caches, use Guava. The Guava cache code has been more completely tested by Google in high load production environments, and it tends to have fewer bugs. It enables caches to be built at any time, rather than only at server startup. By creating a Guava cache as soon as it is declared, rather than during the LifecycleListener.start() for the CachePool, we can promise any downstream consumer of the cache that the cache is ready to execute requests the moment it is supplied by Guice. This fixes a startup ordering problem in the GroupCache and the ProjectCache, where code wants to use one of these caches during startup to resolve a group or project by name. Tracking the Gauva backend caches with a DynamicMap makes it possible for plugins to define their own in-memory caches using CacheModule's cache() function to declare the cache. It allows the core server to make the cache available to administrators over SSH with the gerrit show-caches and gerrit flush-caches commands. Persistent caches store in a private H2 database per cache, with a simple one-table schema that stores each entry in a table row as a pair of serialized objects (key and value). Database reads are gated by a BloomFilter, to reduce the number of calls made to H2 during cache misses. In theory less than 3% of cache misses will reach H2 and find nothing. Stores happen on a background thread quickly after the put is made to the cache, reducing the risk that a diff or web_session record is lost during an ungraceful shutdown. Cache databases are capped around 128M worth of stored data by running a prune cycle each day at 1 AM local server time. Records are removed from the database by ordering on the last access time, where last accessed is the last time the record was moved from disk to memory. Change-Id: Ia82d056796b5af9bcb1f219fe06d905c9c0fbc84
75 lines
2.2 KiB
XML
75 lines
2.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (C) 2009 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.google.gerrit</groupId>
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<artifactId>gerrit-parent</artifactId>
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<version>2.5-SNAPSHOT</version>
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</parent>
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<artifactId>gerrit-sshd</artifactId>
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<name>Gerrit Code Review - SSHd</name>
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<description>
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Java SSH daemon with Gerrit commands and Git support
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</description>
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<dependencies>
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<dependency>
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<groupId>log4j</groupId>
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<artifactId>log4j</artifactId>
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</dependency>
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<dependency>
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<groupId>org.eclipse.jgit</groupId>
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<artifactId>org.eclipse.jgit.junit</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apache.sshd</groupId>
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<artifactId>sshd-core</artifactId>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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</dependency>
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<dependency>
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<groupId>com.google.gerrit</groupId>
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<artifactId>gerrit-util-cli</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.gerrit</groupId>
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<artifactId>gerrit-server</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.gerrit</groupId>
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<artifactId>gerrit-cache-h2</artifactId>
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<version>${project.version}</version>
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</dependency>
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</dependencies>
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</project>
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