99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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* Copyright 2003-2019 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PROXY_INPUT_STREAM_HXX
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#define MPD_PROXY_INPUT_STREAM_HXX
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#include "InputStream.hxx"
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#include "Ptr.hxx"
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#include "Handler.hxx"
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#include "thread/Cond.hxx"
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struct Tag;
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/**
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* An #InputStream that forwards all methods call to another
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* #InputStream instance. This can be used as a base class to
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* override selected methods.
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*
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* The inner #InputStream instance may be nullptr initially, to be set
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* later.
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*/
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class ProxyInputStream : public InputStream, protected InputStreamHandler {
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Cond set_input_cond;
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protected:
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InputStreamPtr input;
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public:
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explicit ProxyInputStream(InputStreamPtr _input) noexcept;
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/**
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* Construct an instance without an #InputStream instance.
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* Once that instance becomes available, call SetInput().
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*/
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ProxyInputStream(const char *_uri,
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Mutex &_mutex) noexcept
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:InputStream(_uri, _mutex) {}
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virtual ~ProxyInputStream() noexcept;
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ProxyInputStream(const ProxyInputStream &) = delete;
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ProxyInputStream &operator=(const ProxyInputStream &) = delete;
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/* virtual methods from InputStream */
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void Check() override;
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void Update() noexcept override;
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void Seek(std::unique_lock<Mutex> &lock,
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offset_type new_offset) override;
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bool IsEOF() const noexcept override;
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std::unique_ptr<Tag> ReadTag() noexcept override;
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bool IsAvailable() const noexcept override;
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size_t Read(std::unique_lock<Mutex> &lock,
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void *ptr, size_t read_size) override;
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protected:
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/**
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* If this instance was initialized without an input, this
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* method can set it.
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*
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* Caller must lock the mutex.
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*/
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void SetInput(InputStreamPtr _input) noexcept;
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/**
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* Copy public attributes from the underlying input stream to the
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* "rewind" input stream. This function is called when a method of
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* the underlying stream has returned, which may have modified these
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* attributes.
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*/
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void CopyAttributes();
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/* virtual methods from class InputStreamHandler */
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void OnInputStreamReady() noexcept override {
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InvokeOnReady();
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}
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void OnInputStreamAvailable() noexcept override {
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InvokeOnAvailable();
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}
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};
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#endif
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