48 lines
1.7 KiB
C#
48 lines
1.7 KiB
C#
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//----------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//----------------------------------------------------------------
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namespace System.ServiceModel.Discovery
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{
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using System;
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using System.Runtime;
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using SR2 = System.ServiceModel.Discovery.SR;
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public class DiscoveryMessageSequenceGenerator
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{
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static readonly DateTime DT1970 = new DateTime(1970, 1, 1);
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long instanceId;
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Uri sequenceId;
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[Fx.Tag.SynchronizationObject(Blocking = false, Kind = Fx.Tag.SynchronizationKind.InterlockedNoSpin)]
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long messageNumber;
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public DiscoveryMessageSequenceGenerator()
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: this(CreateInstanceId(), null)
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{
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}
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[Fx.Tag.Throws(typeof(ArgumentOutOfRangeException), "instanceId")]
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public DiscoveryMessageSequenceGenerator(long instanceId, Uri sequenceId)
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{
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if (instanceId < 0 || instanceId > UInt32.MaxValue)
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{
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throw FxTrace.Exception.ArgumentOutOfRange("instanceId", instanceId, SR2.DiscoveryAppSequenceInstanceIdOutOfRange);
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}
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this.instanceId = instanceId;
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this.sequenceId = sequenceId;
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}
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static long CreateInstanceId()
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{
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return (long)DateTime.Now.Subtract(DT1970).TotalSeconds;
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}
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[Fx.Tag.InheritThrows(From = "DiscoveryMessageSequenceGenerator", FromDeclaringType = typeof(DiscoveryMessageSequenceGenerator))]
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public DiscoveryMessageSequence Next()
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{
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return new DiscoveryMessageSequence(this.instanceId, this.sequenceId, Threading.Interlocked.Increment(ref this.messageNumber));
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}
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}
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}
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