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Viewing changes to contrib/NGit/NGit.Util.IO/StreamCopyThread.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NGit/NGit.Util.IO/StreamCopyThread.cs
 
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/*
 
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This code is derived from jgit (http://eclipse.org/jgit).
 
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Copyright owners are documented in jgit's IP log.
 
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This program and the accompanying materials are made available
 
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under the terms of the Eclipse Distribution License v1.0 which
 
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accompanies this distribution, is reproduced below, and is
 
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available at http://www.eclipse.org/org/documents/edl-v10.php
 
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All rights reserved.
 
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Redistribution and use in source and binary forms, with or
 
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without modification, are permitted provided that the following
 
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conditions are met:
 
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- Redistributions of source code must retain the above copyright
 
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  notice, this list of conditions and the following disclaimer.
 
18
 
 
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- Redistributions in binary form must reproduce the above
 
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  copyright notice, this list of conditions and the following
 
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  disclaimer in the documentation and/or other materials provided
 
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  with the distribution.
 
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- Neither the name of the Eclipse Foundation, Inc. nor the
 
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  names of its contributors may be used to endorse or promote
 
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  products derived from this software without specific prior
 
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  written permission.
 
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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*/
 
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using System.IO;
 
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using System.Threading;
 
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using Sharpen;
 
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namespace NGit.Util.IO
 
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{
 
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        /// <summary>Thread to copy from an input stream to an output stream.</summary>
 
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        /// <remarks>Thread to copy from an input stream to an output stream.</remarks>
 
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        internal class StreamCopyThread : Sharpen.Thread
 
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        {
 
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                private const int BUFFER_SIZE = 1024;
 
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                private readonly InputStream src;
 
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                private readonly OutputStream dst;
 
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                private volatile bool done;
 
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                /// <summary>Create a thread to copy data from an input stream to an output stream.</summary>
 
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                /// <remarks>Create a thread to copy data from an input stream to an output stream.</remarks>
 
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                /// <param name="i">
 
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                /// stream to copy from. The thread terminates when this stream
 
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                /// reaches EOF. The thread closes this stream before it exits.
 
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                /// </param>
 
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                /// <param name="o">
 
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                /// stream to copy into. The destination stream is automatically
 
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                /// closed when the thread terminates.
 
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                /// </param>
 
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                public StreamCopyThread(InputStream i, OutputStream o)
 
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                {
 
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                        SetName(Sharpen.Thread.CurrentThread().GetName() + "-StreamCopy");
 
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                        src = i;
 
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                        dst = o;
 
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                }
 
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                /// <summary>Request the thread to flush the output stream as soon as possible.</summary>
 
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                /// <remarks>
 
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                /// Request the thread to flush the output stream as soon as possible.
 
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                /// <p>
 
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                /// This is an asynchronous request to the thread. The actual flush will
 
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                /// happen at some future point in time, when the thread wakes up to process
 
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                /// the request.
 
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                /// </remarks>
 
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                public virtual void Flush()
 
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                {
 
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                        Interrupt();
 
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                }
 
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                /// <summary>Request that the thread terminate, and wait for it.</summary>
 
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                /// <remarks>
 
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                /// Request that the thread terminate, and wait for it.
 
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                /// <p>
 
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                /// This method signals to the copy thread that it should stop as soon as
 
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                /// there is no more IO occurring.
 
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                /// </remarks>
 
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                /// <exception cref="System.Exception">the calling thread was interrupted.</exception>
 
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                public virtual void Halt()
 
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                {
 
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                        for (; ; )
 
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                        {
 
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                                Join(250);
 
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                                if (IsAlive())
 
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                                {
 
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                                        done = true;
 
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                                        Interrupt();
 
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                                }
 
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                                else
 
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                                {
 
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                                        break;
 
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                                }
 
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                        }
 
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                }
 
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                public override void Run()
 
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                {
 
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                        try
 
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                        {
 
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                                byte[] buf = new byte[BUFFER_SIZE];
 
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                                int interruptCounter = 0;
 
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                                for (; ; )
 
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                                {
 
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                                        try
 
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                                        {
 
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                                                if (interruptCounter > 0)
 
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                                                {
 
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                                                        dst.Flush();
 
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                                                        interruptCounter--;
 
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                                                }
 
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                                                if (done)
 
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                                                {
 
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                                                        break;
 
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                                                }
 
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                                                int n;
 
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                                                try
 
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                                                {
 
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                                                        n = src.Read(buf);
 
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                                                }
 
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                                                catch (ThreadInterruptedException)
 
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                                                {
 
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                                                        interruptCounter++;
 
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                                                        continue;
 
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                                                }
 
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                                                if (n < 0)
 
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                                                {
 
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                                                        break;
 
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                                                }
 
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                                                bool writeInterrupted = false;
 
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                                                for (; ; )
 
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                                                {
 
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                                                        try
 
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                                                        {
 
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                                                                dst.Write(buf, 0, n);
 
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                                                        }
 
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                                                        catch (ThreadInterruptedException)
 
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                                                        {
 
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                                                                writeInterrupted = true;
 
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                                                                continue;
 
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                                                        }
 
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                                                        // set interrupt status, which will be checked
 
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                                                        // when we block in src.read
 
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                                                        if (writeInterrupted)
 
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                                                        {
 
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                                                                Interrupt();
 
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                                                        }
 
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                                                        break;
 
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                                                }
 
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                                        }
 
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                                        catch (IOException)
 
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                                        {
 
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                                                break;
 
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                                        }
 
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                                }
 
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                        }
 
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                        finally
 
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                        {
 
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                                try
 
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                                {
 
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                                        src.Close();
 
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                                }
 
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                                catch (IOException)
 
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                                {
 
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                                }
 
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                                // Ignore IO errors on close
 
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                                try
 
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                                {
 
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                                        dst.Close();
 
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                                }
 
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                                catch (IOException)
 
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                                {
 
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                                }
 
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                        }
 
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                }
 
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                // Ignore IO errors on close
 
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        }
 
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}