1 #region Copyright notice and license 2 3 // Copyright 2019 The gRPC Authors 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 17 #endregion 18 19 using Grpc.Core.Utils; 20 using System; 21 using System.Threading; 22 23 using System.Buffers; 24 25 namespace Grpc.Core.Internal 26 { 27 // Allow creating instances of Memory<byte> from Slice. 28 // Represents a chunk of native memory, but doesn't manage its lifetime. 29 // Instances of this class are reuseable - they can be reset to point to a different memory chunk. 30 // That is important to make the instances cacheable (rather then creating new instances 31 // the old ones will be reused to reduce GC pressure). 32 internal class SliceMemoryManager : MemoryManager<byte> 33 { 34 private Slice slice; 35 Reset(Slice slice)36 public void Reset(Slice slice) 37 { 38 this.slice = slice; 39 } 40 Reset()41 public void Reset() 42 { 43 Reset(new Slice(IntPtr.Zero, 0)); 44 } 45 GetSpan()46 public override Span<byte> GetSpan() 47 { 48 return slice.ToSpanUnsafe(); 49 } 50 Pin(int elementIndex = 0)51 public override MemoryHandle Pin(int elementIndex = 0) 52 { 53 throw new NotSupportedException(); 54 } 55 Unpin()56 public override void Unpin() 57 { 58 } 59 Dispose(bool disposing)60 protected override void Dispose(bool disposing) 61 { 62 // NOP 63 } 64 } 65 } 66