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24 lines
1.3 KiB
24 lines
1.3 KiB
3 years ago
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# Driver Library Design
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This document outlines the design for this package.
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## Deployment, Server, and Connection
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Acquiring a `Connection` from a `Server` selected from a `Deployment` enables sending and receiving
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wire messages. A `Deployment` represents an set of MongoDB servers and a `Server` represents a
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member of that set. These three types form the operation execution stack.
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### Compression
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Compression is handled by Connection type while uncompression is handled automatically by the
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Operation type. This is done because the compressor to use for compressing a wire message is
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chosen by the connection during handshake, while uncompression can be performed without this
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information. This does make the design of compression non-symmetric, but it makes the design simpler
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to implement and more consistent.
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## Operation
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The `Operation` type handles executing a series of commands using a `Deployment`. For most uses
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`Operation` will only execute a single command, but the main use case for a series of commands is
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batch split write commands, such as insert. The type itself is heavily documented, so reading the
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code and comments together should provide an understanding of how the type works.
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This type is not meant to be used directly by callers. Instead a wrapping type should be defined
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using the IDL.
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