54 lines
1.9 KiB
C#
54 lines
1.9 KiB
C#
/*
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Copyright 2011 Google Inc
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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using Google.Apis.Logging;
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using System;
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namespace Google
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{
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/// <summary>Defines the context in which this library runs. It allows setting up custom loggers.</summary>
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public static class ApplicationContext
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{
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private static ILogger logger;
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// For testing
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internal static void Reset() => logger = null;
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/// <summary>Returns the logger used within this application context.</summary>
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/// <remarks>It creates a <see cref="NullLogger"/> if no logger was registered previously</remarks>
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public static ILogger Logger
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{
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get
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{
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// Register the default null-logger if no other one was set.
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return logger ?? (logger = new NullLogger());
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}
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}
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/// <summary>Registers a logger with this application context.</summary>
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/// <exception cref="InvalidOperationException">Thrown if a logger was already registered.</exception>
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public static void RegisterLogger(ILogger loggerToRegister)
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{
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// TODO(peleyal): Reconsider why the library should contain only one logger. Also consider using Tracing!
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if (logger != null && !(logger is NullLogger))
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{
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throw new InvalidOperationException("A logger was already registered with this context.");
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}
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logger = loggerToRegister;
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}
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}
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}
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