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//
// QueryOptions.cs
//
// Author:
// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
//
// Copyright (c) 2010 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if NET_4_0
using System;
using System.Threading;
namespace System.Linq.Parallel
{
internal class QueryOptions
{
public ParallelMergeOptions? Options {
get;
private set;
}
public ParallelExecutionMode? Mode {
get;
private set;
}
public CancellationToken Token {
get;
private set;
}
/* This token is to be used by some operator (like Take) to tell that
* the execution of the query can be prematurly stopped
*
* It is set when passing QueryOptions to the different node's Get method
* and ParallelExecuter should check after the call to this method is this guy has been
* set. Operator may chain up multiple cancellation token that way.
* When checking for this token, the task body should simply return.
*/
public CancellationToken ImplementerToken {
get;
private set;
}
public bool UseStrip {
get;
private set;
}
public bool? BehindOrderGuard {
get;
private set;
}
public int PartitionCount {
get;
private set;
}
public Tuple<bool, bool, bool> PartitionerSettings {
get;
internal set;
}
public CancellationToken MergedToken {
get;
private set;
}
public bool ShouldBeSequential {
get;
private set;
}
public QueryOptions (ParallelMergeOptions? options,
ParallelExecutionMode? mode,
CancellationToken token,
bool useStrip,
bool? behindOrderGuard,
int partitionCount,
CancellationToken implementerToken,
bool shouldBeSequential)
{
Options = options;
Mode = mode;
Token = token;
UseStrip = useStrip;
BehindOrderGuard = behindOrderGuard;
PartitionCount = partitionCount;
PartitionerSettings = null;
ImplementerToken = implementerToken;
ShouldBeSequential = shouldBeSequential;
MergeTokens (token, implementerToken);
}
void MergeTokens (CancellationToken token, CancellationToken implementerToken)
{
bool implementedNone = implementerToken == CancellationToken.None;
bool tokenNone = token == CancellationToken.None;
if (!implementedNone && !tokenNone)
MergedToken = CancellationTokenSource.CreateLinkedTokenSource (implementerToken, token).Token;
else if (implementedNone && !tokenNone)
MergedToken = token;
else if (!implementedNone && tokenNone)
MergedToken = implementerToken;
else
MergedToken = CancellationToken.None;
}
}
}
#endif
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