f4cb3b8a4f
Previously, we used the existence of a `prior*` field in the Resource object as an indication for whether we should consult the cache or not. However, this is prone to error, since a failed cache lookup won't set any prior fields. Therefore, we manually set `priorExpires` to 0. This in turn triggered another bug where generated wrong expiration timestamps when the server response we got was expired (or expired between sending and receiving). This commit changes the flags so that we can now explicitly request CacheOnly/NetworkOnly (or All) loading methods, rather than the implicit Optional/Required naming scheme.
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
#pragma once
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#include <mbgl/storage/response.hpp>
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#include <mbgl/storage/resource.hpp>
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#include <mbgl/util/noncopyable.hpp>
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#include <mbgl/util/async_request.hpp>
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#include <functional>
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#include <memory>
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namespace mbgl {
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class FileSource : private util::noncopyable {
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public:
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virtual ~FileSource() = default;
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using Callback = std::function<void (Response)>;
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// Request a resource. The callback will be called asynchronously, in the same
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// thread as the request was made. This thread must have an active RunLoop. The
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// request may be cancelled before completion by releasing the returned AsyncRequest.
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// If the request is cancelled before the callback is executed, the callback will
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// not be executed.
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virtual std::unique_ptr<AsyncRequest> request(const Resource&, Callback) = 0;
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// When a file source supports consulting a local cache only, it must return true.
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// Cache-only requests are requests that aren't as urgent, but could be useful, e.g.
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// to cover part of the map while loading. The FileSource should only do cheap actions to
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// retrieve the data, e.g. load it from a cache, but not from the internet.
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virtual bool supportsCacheOnlyRequests() const {
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return false;
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}
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};
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} // namespace mbgl
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