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548 lines
20 KiB
C#
548 lines
20 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace cmonitor.libs
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{
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/// <summary>
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/// InitLocal 和 InitGlobal 都可以初始化，都初始化时，需要启动 StartLoop，将InitGlobal同步数据到Local
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/// AddAttributeAction 设置状态变化回调，需要启动 Loop，监听数据变化
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/// </summary>
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public sealed class ShareMemory
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{
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private const int shareMemoryAttributeIndex = 0;
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private const int shareMemoryAttributeSize = 1;
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private const int shareMemoryVersionSize = 8;
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private const int shareMemoryVersionIndex = 1;
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private const int shareMemoryHeadSize = shareMemoryAttributeSize + shareMemoryVersionSize;
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private string key;
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private int length;
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private int itemSize;
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private byte[] bytes;
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private object lockObj = new object();
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private long version = 0;
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IShareMemory accessorLocal = null;
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IShareMemory accessorGlobal = null;
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private readonly ShareMemoryAttribute[] itemAttributes = Array.Empty<ShareMemoryAttribute>();
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private readonly long[] itemVersions = Array.Empty<long>();
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ConcurrentDictionary<int, List<Action<ShareMemoryAttribute>>> attributeActions = new ConcurrentDictionary<int, List<Action<ShareMemoryAttribute>>>();
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private CancellationTokenSource cancellationTokenSource;
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private ConcurrentQueue<ShareItemAttributeChanged> attributeChangeds = new ConcurrentQueue<ShareItemAttributeChanged>();
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private readonly Dictionary<string, ShareItemInfo> dic = new Dictionary<string, ShareItemInfo>();
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public ShareMemory(string key, int length, int itemSize)
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{
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this.key = key;
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this.length = length;
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this.itemSize = itemSize;
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bytes = new byte[length * itemSize];
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itemAttributes = new ShareMemoryAttribute[length];
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itemVersions = new long[length];
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}
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public void InitLocal()
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{
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try
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{
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if (accessorLocal == null)
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{
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accessorLocal = ShareMemoryFactory.Create(key, length, itemSize);
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if (accessorLocal.Init() == false)
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{
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accessorLocal = null;
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}
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}
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}
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catch (Exception)
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{
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}
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}
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private byte[] gloablBytes;
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public void InitGlobal()
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{
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try
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{
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if (OperatingSystem.IsWindows() && accessorGlobal == null)
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{
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gloablBytes = new byte[bytes.Length];
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accessorGlobal = ShareMemoryFactory.Create($"Global\\{key}", length, itemSize);
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if (accessorGlobal.Init() == false)
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{
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accessorGlobal = null;
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}
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}
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}
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catch (Exception)
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{
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}
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}
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public void AddAttributeAction(int index, Action<ShareMemoryAttribute> action)
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{
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if (attributeActions.TryGetValue(index, out List<Action<ShareMemoryAttribute>> actions) == false)
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{
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actions = new List<Action<ShareMemoryAttribute>>();
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attributeActions.TryAdd(index, actions);
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}
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if (actions.Any(c => c == action) == false)
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{
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actions.Add(action);
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}
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}
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public void RemoveAttributeAction(int index, Action<ShareMemoryAttribute> action)
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{
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if (attributeActions.TryGetValue(index, out List<Action<ShareMemoryAttribute>> actions) == false)
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{
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return;
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}
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actions.Remove(action);
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}
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public void StartLoop()
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{
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cancellationTokenSource?.Cancel();
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cancellationTokenSource = new CancellationTokenSource();
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Task.Factory.StartNew(() =>
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{
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while (cancellationTokenSource.IsCancellationRequested == false)
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{
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try
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{
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SyncMemory();
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AttributeCallback();
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ReadItems();
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}
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catch (Exception)
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{
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}
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Thread.Sleep(10);
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}
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}, TaskCreationOptions.LongRunning);
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Task.Factory.StartNew(() =>
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{
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while (cancellationTokenSource.IsCancellationRequested == false)
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{
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try
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{
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while (attributeChangeds.TryDequeue(out ShareItemAttributeChanged result))
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{
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result.Action(result.Attribute);
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}
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}
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catch (Exception)
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{
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}
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Thread.Sleep(30);
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}
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}, TaskCreationOptions.LongRunning);
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}
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private void AttributeCallback()
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return;
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bool allUpdated = false;
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for (int index = 0; index < length; index++)
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{
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ShareMemoryAttribute attribute = ReadAttribute(accessorLocal, index);
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bool updated = ReadVersionUpdated(accessorLocal, index);
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allUpdated |= updated;
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if (updated)
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{
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itemAttributes[index] &= (~ShareMemoryAttribute.Updated);
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attribute |= ShareMemoryAttribute.Updated;
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}
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if (attribute != itemAttributes[index])
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{
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itemAttributes[index] = attribute;
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if (attributeActions.TryGetValue(index, out List<Action<ShareMemoryAttribute>> actions) && actions.Count > 0)
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{
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foreach (var action in actions)
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{
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attributeChangeds.Enqueue(new ShareItemAttributeChanged { Action=action, Attribute= attribute });
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}
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}
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}
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}
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if (allUpdated)
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{
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version++;
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}
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}
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private void SyncMemory()
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{
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if (accessorGlobal != null && accessorLocal != null)
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{
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lock (lockObj)
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{
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accessorGlobal.ReadArray(0, gloablBytes, 0, gloablBytes.Length);
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accessorLocal.WriteArray(0, gloablBytes, 0, itemSize);
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for (int index = 0; index < length; index++)
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{
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//检查更新状态
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if (ReadVersionUpdated(accessorGlobal, index) == false)
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{
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continue;
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}
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int _index = index * itemSize;
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int keyLen = BitConverter.ToInt32(gloablBytes, _index + shareMemoryHeadSize);
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if (keyLen > 0)
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{
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accessorLocal.WriteArray(_index, gloablBytes, _index, itemSize);
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}
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}
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}
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}
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}
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private void ReadItems()
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return;
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try
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{
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lock (lockObj)
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{
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accessor.ReadArray(0, bytes, 0, bytes.Length);
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for (int index = 0; index < length; index++)
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{
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ShareMemoryAttribute attribute = ReadAttribute(accessor, index);
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long itemVersion = ReadVersion(accessor, index);
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bool skip = (itemVersion <= itemVersions[index] || (attribute & ShareMemoryAttribute.HiddenForList) == ShareMemoryAttribute.HiddenForList);
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itemVersions[index] = itemVersion;
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if (skip)
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{
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continue;
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}
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//key length
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int _index = index * itemSize + shareMemoryHeadSize;
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int keyLen = BitConverter.ToInt32(bytes, _index);
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_index += 4;
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if (keyLen > 0 && keyLen + 8 + shareMemoryHeadSize < itemSize)
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{
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//key
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string key = Encoding.UTF8.GetString(bytes, _index, keyLen);
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_index += keyLen;
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//val length
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string val = string.Empty;
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int valLen = BitConverter.ToInt32(bytes, _index);
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_index += 4;
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//value
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if (keyLen + 8 + shareMemoryHeadSize + valLen <= itemSize)
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{
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val = Encoding.UTF8.GetString(bytes, _index, valLen);
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}
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dic[key] = new ShareItemInfo
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{
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Index = index,
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Value = val
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};
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}
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}
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}
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}
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catch (Exception)
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{
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}
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}
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public Dictionary<string, ShareItemInfo> ReadItems(out long version)
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{
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version = this.version;
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return dic;
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}
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public string ReadValueString(int index)
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{
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byte[] bytes = ReadValueArray(index);
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if (bytes.Length == 0) return string.Empty;
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return Encoding.UTF8.GetString(bytes);
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}
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public long ReadValueInt64(int index)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null || index >= length) return 0;
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index = index * itemSize + shareMemoryHeadSize;
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int keylen = accessor.ReadInt(index);
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index += 4 + keylen;
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if (keylen == 0) return 0;
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int vallen = accessor.ReadInt(index);
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index += 4;
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if (vallen == 0 || keylen + 8 + shareMemoryHeadSize + vallen > itemSize) return 0;
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return accessor.ReadInt64(index);
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}
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public byte[] ReadValueArray(int index)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null || index >= length) return Array.Empty<byte>();
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index = index * itemSize + shareMemoryHeadSize;
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int keylen = accessor.ReadInt(index);
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index += 4 + keylen;
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if (keylen == 0) return Array.Empty<byte>();
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int vallen = accessor.ReadInt(index);
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index += 4;
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if (vallen == 0 || keylen + 8 + shareMemoryHeadSize + vallen > itemSize) return Array.Empty<byte>();
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byte[] bytes = new byte[vallen];
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accessor.ReadArray(index, bytes, 0, bytes.Length);
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return bytes;
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}
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public bool Update(int index, string key, string value,
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ShareMemoryAttribute addAttri = ShareMemoryAttribute.None,
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ShareMemoryAttribute removeAttri = ShareMemoryAttribute.None)
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{
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if (string.IsNullOrWhiteSpace(key))
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{
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return Update(index, Array.Empty<byte>(), Encoding.UTF8.GetBytes(value), addAttri, removeAttri);
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}
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else
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{
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return Update(index, Encoding.UTF8.GetBytes(key), Encoding.UTF8.GetBytes(value), addAttri, removeAttri);
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}
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}
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public bool Update(int index, byte[] key, byte[] value,
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ShareMemoryAttribute addAttri = ShareMemoryAttribute.None,
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ShareMemoryAttribute removeAttri = ShareMemoryAttribute.None)
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{
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try
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{
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if (accessorLocal == null && accessorGlobal == null) return false;
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if (index == 0 || index > length) return false;
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if (key.Length + 8 + shareMemoryHeadSize + value.Length > itemSize) return false;
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lock (lockObj)
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{
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int valIndex = index * itemSize + shareMemoryHeadSize;
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int startIndex = valIndex;
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int keylen = key.Length;
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int vallen = value.Length;
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if (key.Length > 0)
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{
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if (accessorLocal != null)
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{
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accessorLocal.WriteInt(valIndex, keylen);
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accessorLocal.WriteArray(valIndex + 4, key, 0, key.Length);
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}
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if (accessorGlobal != null)
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{
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accessorGlobal.WriteInt(valIndex, keylen);
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accessorGlobal.WriteArray(valIndex + 4, key, 0, key.Length);
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}
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valIndex += 4 + key.Length;
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}
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else
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{
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int keyLen = 0;
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if (accessorLocal != null)
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{
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keyLen = accessorLocal.ReadInt(valIndex);
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}
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if (keyLen == 0 && accessorGlobal != null)
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{
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keyLen = accessorGlobal.ReadInt(valIndex);
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}
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valIndex += 4 + keyLen;
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}
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if (accessorLocal != null)
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{
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accessorLocal.WriteInt(valIndex, vallen);
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accessorLocal.WriteArray(valIndex + 4, value, 0, value.Length);
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}
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if (accessorGlobal != null)
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{
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accessorGlobal.WriteInt(valIndex, vallen);
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accessorGlobal.WriteArray(valIndex + 4, value, 0, value.Length);
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}
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IncrementVersion(index);
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if (removeAttri > 0)
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{
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RemoveAttribute(index, removeAttri);
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}
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if (addAttri > 0)
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{
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AddAttribute(index, addAttri);
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}
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}
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return true;
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}
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catch (Exception)
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{
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}
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return false;
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}
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private ShareMemoryAttribute ReadAttribute(IShareMemory accessor, int index)
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{
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if (accessor == null || index >= length) return ShareMemoryAttribute.None;
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ShareMemoryAttribute stateByte = (ShareMemoryAttribute)accessor.ReadByte(index * itemSize + shareMemoryAttributeIndex);
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return stateByte;
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}
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private bool ReadAttributeEqual(IShareMemory accessor, int index, ShareMemoryAttribute attribute)
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{
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if (accessor == null || index >= length) return false;
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ShareMemoryAttribute attributeByte = (ShareMemoryAttribute)accessor.ReadByte(index * itemSize + shareMemoryAttributeIndex);
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return (attributeByte & attribute) == attribute;
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}
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private void AddAttribute(IShareMemory accessor, int index, ShareMemoryAttribute attribute)
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{
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if (accessor == null || index >= length) return;
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byte attributeValue = accessor.ReadByte(index * itemSize + shareMemoryAttributeIndex);
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byte attributeByte = (byte)attribute;
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attributeValue |= attributeByte;
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accessor.WriteByte(index * itemSize + shareMemoryAttributeIndex, attributeValue);
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IncrementVersion(accessor, index);
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}
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private void RemoveAttribute(IShareMemory accessor, int index, ShareMemoryAttribute attribute)
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{
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if (accessor == null || index >= length) return;
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byte attributeValue = accessor.ReadByte(index * itemSize + shareMemoryAttributeIndex);
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byte attributeByte = (byte)attribute;
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attributeValue &= (byte)(~attributeByte);
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accessor.WriteByte(index * itemSize + shareMemoryAttributeIndex, attributeValue);
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IncrementVersion(accessor, index);
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}
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private void IncrementVersion(IShareMemory accessor, int index)
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{
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if (accessor == null || index >= length) return;
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long version = accessor.ReadInt64(index * itemSize + shareMemoryVersionIndex);
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accessor.WriteInt64(index * itemSize + shareMemoryVersionIndex, version + 1);
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}
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private long ReadVersion(IShareMemory accessor, int index)
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{
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if (accessor == null || index >= length) return 0;
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long version = accessor.ReadInt64(index * itemSize + shareMemoryVersionIndex);
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return version;
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}
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private bool ReadVersionUpdated(IShareMemory accessor, int index)
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{
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long version = ReadVersion(accessor, index);
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return version > itemVersions[index];
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}
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private bool ReadVersionUpdated(IShareMemory accessor, int index, long version)
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{
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long _version = ReadVersion(accessor, index);
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return _version > version;
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}
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public ShareMemoryAttribute ReadAttribute(int index)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return ShareMemoryAttribute.None;
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return ReadAttribute(accessor, index);
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}
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public bool ReadAttributeEqual(int index, ShareMemoryAttribute attribute)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return false;
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return ReadAttributeEqual(accessor, index, attribute);
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}
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public void AddAttribute(int index, ShareMemoryAttribute attribute)
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{
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AddAttribute(accessorLocal, index, attribute);
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AddAttribute(accessorGlobal, index, attribute);
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}
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public void RemoveAttribute(int index, ShareMemoryAttribute attribute)
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{
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RemoveAttribute(accessorLocal, index, attribute);
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RemoveAttribute(accessorGlobal, index, attribute);
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}
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public void IncrementVersion(int index)
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{
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IncrementVersion(accessorLocal, index);
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IncrementVersion(accessorGlobal, index);
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}
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public long ReadVersion(int index)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return 0;
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return ReadVersion(accessor, index);
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}
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public bool ReadVersionUpdated(int index)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return false;
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return ReadVersionUpdated(accessor, index);
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}
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public bool ReadVersionUpdated(int index, long version)
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{
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IShareMemory accessor = accessorLocal ?? accessorGlobal;
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if (accessor == null) return false;
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return ReadVersionUpdated(accessor, index, version);
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}
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}
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public enum ShareMemoryAttribute : byte
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{
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None = 0,
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Updated = 0b0000_0001,
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Closed = 0b0000_0010,
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Running = 0b0000_0100,
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HiddenForList = 0b0000_1000,
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All = 0b1111_1111
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}
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public sealed class ShareItemAttributeChanged
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{
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public Action<ShareMemoryAttribute> Action { get; set; }
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public ShareMemoryAttribute Attribute { get; set; }
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}
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public sealed partial class ShareItemInfo
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{
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/// <summary>
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/// 内存下标
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/// </summary>
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public int Index { get; set; }
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/// <summary>
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/// 内存值
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/// </summary>
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public string Value { get; set; }
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}
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}
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