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AdversarialPagedFile.java
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AdversarialPagedFile.java
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/*
* Copyright (c) 2002-2015 "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.adversaries.pagecache;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Objects;
import org.neo4j.adversaries.Adversary;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.io.pagecache.PagedFile;
/**
* A {@linkplain PagedFile paged file} that wraps another paged file and an {@linkplain Adversary adversary} to provide
* a misbehaving paged file implementation for testing.
* <p>
* Depending on the adversary each operation can throw either {@link RuntimeException} like {@link SecurityException}
* or {@link IOException} like {@link FileNotFoundException}.
*/
@SuppressWarnings( "unchecked" )
class AdversarialPagedFile implements PagedFile
{
private final PagedFile delegate;
private final Adversary adversary;
AdversarialPagedFile( PagedFile delegate, Adversary adversary )
{
this.delegate = Objects.requireNonNull( delegate );
this.adversary = Objects.requireNonNull( adversary );
}
@Override
public PageCursor io( long pageId, int pf_flags ) throws IOException
{
adversary.injectFailure( IllegalStateException.class );
PageCursor pageCursor = delegate.io( pageId, pf_flags );
if ( (pf_flags & PF_SHARED_LOCK) == PF_SHARED_LOCK )
{
return new AdversarialReadPageCursor( pageCursor, adversary );
}
return new AdversarialWritePageCursor( pageCursor, adversary );
}
@Override
public int pageSize()
{
return delegate.pageSize();
}
@Override
public void flushAndForce() throws IOException
{
adversary.injectFailure( FileNotFoundException.class, IOException.class, SecurityException.class );
delegate.flushAndForce();
}
@Override
public long getLastPageId() throws IOException
{
adversary.injectFailure( IllegalStateException.class );
return delegate.getLastPageId();
}
@Override
public void close() throws IOException
{
adversary.injectFailure( FileNotFoundException.class, IOException.class, SecurityException.class );
delegate.close();
}
}