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More convenient test utilities around PageCacheRule and NeoStoreDataS…
…ourceRule
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community/io/src/test/java/org/neo4j/test/rule/PageCacheAndDependenciesRule.java
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| /* | ||
| * Copyright (c) 2002-2017 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.test.rule; | ||
|
|
||
| import org.junit.rules.RuleChain; | ||
| import org.junit.rules.TestRule; | ||
| import org.junit.runner.Description; | ||
| import org.junit.runners.model.Statement; | ||
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|
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| import java.util.function.Supplier; | ||
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| import org.neo4j.io.fs.FileSystemAbstraction; | ||
| import org.neo4j.io.pagecache.PageCache; | ||
| import org.neo4j.test.rule.fs.EphemeralFileSystemRule; | ||
| import org.neo4j.test.rule.fs.FileSystemRule; | ||
|
|
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| /** | ||
| * Very often when you want a {@link PageCacheRule} you also want {@link TestDirectory} and some {@link FileSystemRule}. | ||
| * This is tedious to write and apply in the correct order in every test doing this. This rule collects | ||
| * this threesome into one rule for convenience. | ||
| */ | ||
| public class PageCacheAndDependenciesRule implements TestRule | ||
| { | ||
| private final RuleChain chain; | ||
| private final FileSystemRule<? extends FileSystemAbstraction> fs; | ||
| private final TestDirectory directory; | ||
| private final PageCacheRule pageCacheRule = new PageCacheRule(); | ||
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| public PageCacheAndDependenciesRule() | ||
| { | ||
| this( () -> new EphemeralFileSystemRule() ); | ||
| } | ||
|
|
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| /** | ||
| * @param fsSupplier as {@link Supplier} to make it clear that it is this class that owns the created | ||
| * {@link FileSystemRule} instance. | ||
| */ | ||
| public PageCacheAndDependenciesRule( Supplier<FileSystemRule<? extends FileSystemAbstraction>> fsSupplier ) | ||
| { | ||
| this.fs = fsSupplier.get(); | ||
| this.directory = TestDirectory.testDirectory( fs ); | ||
| this.chain = RuleChain.outerRule( fs ).around( directory ).around( pageCacheRule ); | ||
| } | ||
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| @Override | ||
| public Statement apply( Statement base, Description description ) | ||
| { | ||
| return chain.apply( base, description ); | ||
| } | ||
|
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| public FileSystemRule<? extends FileSystemAbstraction> fileSystemRule() | ||
| { | ||
| return fs; | ||
| } | ||
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| public FileSystemAbstraction fileSystem() | ||
| { | ||
| return fs.get(); | ||
| } | ||
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| public TestDirectory directory() | ||
| { | ||
| return directory; | ||
| } | ||
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| public PageCacheRule pageCacheRule() | ||
| { | ||
| return pageCacheRule; | ||
| } | ||
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| public PageCache pageCache() | ||
| { | ||
| return pageCacheRule.getPageCache( fs ); | ||
| } | ||
| } |
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