Abseil Common Libraries (C++) (grcp 依赖)
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65 lines
2.1 KiB
65 lines
2.1 KiB
2 years ago
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// Copyright 2022 The Abseil Authors.
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//
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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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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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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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// -----------------------------------------------------------------------------
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// File: log/log_sink.h
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// -----------------------------------------------------------------------------
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//
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// This header declares the interface class `absl::LogSink`.
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#ifndef ABSL_LOG_LOG_SINK_H_
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#define ABSL_LOG_LOG_SINK_H_
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#include "absl/base/config.h"
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#include "absl/log/log_entry.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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// absl::LogSink
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//
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// `absl::LogSink` is an interface which can be extended to intercept and
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// process particular messages (with `LOG.ToSinkOnly()` or
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// `LOG.ToSinkAlso()`) or all messages (if registered with
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// `absl::AddLogSink`). Implementations must be thread-safe, and should take
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// care not to take any locks that might be held by the `LOG` caller.
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class LogSink {
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public:
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virtual ~LogSink() = default;
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// LogSink::Send()
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//
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// `Send` is called synchronously during the log statement.
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//
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// It is safe to use `LOG` within an implementation of `Send`. `ToSinkOnly`
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// and `ToSinkAlso` are safe in general but can be used to create an infinite
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// loop if you try.
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virtual void Send(const absl::LogEntry& entry) = 0;
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// LogSink::Flush()
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//
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// Sinks that buffer messages should override this method to flush the buffer
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// and return.
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virtual void Flush() {}
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private:
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// https://lld.llvm.org/missingkeyfunction.html#missing-key-function
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virtual void KeyFunction() const final; // NOLINT(readability/inheritance)
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};
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_LOG_LOG_SINK_H_
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