/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using NUnit.Framework;
namespace Lucene.Net.Store
{
/// Used by MockRAMDirectory to create an output stream that
/// will throw an IOException on fake disk full, track max
/// disk space actually used, and maybe throw random
/// IOExceptions.
///
public sealed class MockRAMOutputStream:RAMOutputStream
{
private MockRAMDirectory dir;
private bool first = true;
private System.String name;
internal byte[] singleByte = new byte[1];
/// Construct an empty output buffer.
public MockRAMOutputStream(MockRAMDirectory dir, RAMFile f, System.String name):base(f)
{
this.dir = dir;
this.name = name;
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
// Now compute actual disk usage & track the maxUsedSize
// in the MockRAMDirectory:
long size = dir.GetRecomputedActualSizeInBytes();
if (size > dir.maxUsedSize)
{
dir.maxUsedSize = size;
}
}
public override void Flush()
{
dir.MaybeThrowDeterministicException();
base.Flush();
}
public override void WriteByte(byte b)
{
singleByte[0] = b;
WriteBytes(singleByte, 0, 1);
}
public override void WriteBytes(byte[] b, int offset, int len)
{
long freeSpace = dir.maxSize - dir.SizeInBytes();
long realUsage = 0;
// If MockRAMDir crashed since we were opened, then
// don't write anything:
if (dir.crashed)
throw new System.IO.IOException("MockRAMDirectory was crashed; cannot write to " + name);
// Enforce disk full:
if (dir.maxSize != 0 && freeSpace <= len)
{
// Compute the real disk free. This will greatly slow
// down our test but makes it more accurate:
realUsage = dir.GetRecomputedActualSizeInBytes();
freeSpace = dir.maxSize - realUsage;
}
if (dir.maxSize != 0 && freeSpace <= len)
{
if (freeSpace > 0 && freeSpace < len)
{
realUsage += freeSpace;
base.WriteBytes(b, offset, (int) freeSpace);
}
if (realUsage > dir.maxUsedSize)
{
dir.maxUsedSize = realUsage;
}
throw new System.IO.IOException("fake disk full at " + dir.GetRecomputedActualSizeInBytes() + " bytes when writing " + name);
}
else
{
base.WriteBytes(b, offset, len);
}
dir.MaybeThrowDeterministicException();
if (first)
{
// Maybe throw random exception; only do this on first
// write to a new file:
first = false;
dir.MaybeThrowIOException();
}
}
}
}