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90 lines
2.4 KiB
Plaintext
90 lines
2.4 KiB
Plaintext
Haskell Thrift Bindings
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License
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=======
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. 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,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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Compile
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=======
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Use Cabal to compile and install; ./configure uses Cabal underneath, and that
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path is not yet well tested. Thrift's library and generated code should compile
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with pretty much any GHC extensions or warnings you enable (or disable).
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Please report this not being the case as a bug on
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https://issues.apache.org/jira/secure/CreateIssue!default.jspa
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Chances you'll need to muck a bit with Cabal flags to install Thrift:
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CABAL_CONFIGURE_FLAGS="--user" ./configure
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Base Types
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==========
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The mapping from Thrift types to Haskell's is:
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* double -> Double
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* byte -> Data.Word.Word8
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* i16 -> Data.Int.Int16
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* i32 -> Data.Int.Int32
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* i64 -> Data.Int.Int64
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* string -> String
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* binary -> Data.ByteString.Lazy
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* bool -> Boolean
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Enums
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=====
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Become Haskell 'data' types. Use fromEnum to get out the int value.
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Structs
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=======
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Become records. Field labels are ugly, of the form f_STRUCTNAME_FIELDNAME. All
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fields are Maybe types.
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Exceptions
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==========
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Identical to structs. Throw them with throwDyn. Catch them with catchDyn.
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Client
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======
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Just a bunch of functions. You may have to import a bunch of client files to
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deal with inheritance.
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Interface
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=========
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You should only have to import the last one in the chain of inheritors. To make
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an interface, declare a label:
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data MyIface = MyIface
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and then declare it an instance of each iface class, starting with the superest
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class and proceding down (all the while defining the methods). Then pass your
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label to process as the handler.
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Processor
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=========
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Just a function that takes a handler label, protocols. It calls the
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superclasses process if there is a superclass.
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