mongodb support
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Henrik Hautakoski
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12 changed files with 2884 additions and 4 deletions
143
lib/mongodb/mongo_except.h
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143
lib/mongodb/mongo_except.h
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/* mongo_except.h */
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/* Copyright 2009 10gen Inc.
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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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* http://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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/* This file is based loosely on cexcept (http://www.nicemice.net/cexcept/). I
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* have modified it to work better with mongo's API.
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*
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* The MONGO_TRY, MONGO_CATCH, and MONGO_TROW macros assume that a pointer to
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* the current connection is available as 'conn'. If you would like to use a
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* different name, use the _GENERIC version of these macros.
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*
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* WARNING: do not return or otherwise jump (excluding MONGO_TRHOW()) out of a
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* MONGO_TRY block as the nessesary clean-up code will not be called. Jumping
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* out of the MONGO_CATCH block is OK.
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*/
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#ifdef MONGO_CODE_EXAMPLE
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mongo_connection conn[1]; /* makes conn a ptr to the connection */
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MONGO_TRY{
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mongo_find_one(...);
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MONGO_THROW(conn, MONGO_EXCEPT_NETWORK);
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}MONGO_CATCH{
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switch(conn->exception->type){
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case MONGO_EXCEPT_NETWORK:
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do_something();
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case MONGO_EXCEPT_FIND_ERR:
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do_something();
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default:
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MONGO_RETHROW();
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}
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}
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#endif
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/* ORIGINAL CEXEPT COPYRIGHT:
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cexcept: README 2.0.1 (2008-Jul-23-Wed)
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http://www.nicemice.net/cexcept/
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Adam M. Costello
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http://www.nicemice.net/amc/
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The package is both free-as-in-speech and free-as-in-beer:
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Copyright (c) 2000-2008 Adam M. Costello and Cosmin Truta.
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This package may be modified only if its author and version
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information is updated accurately, and may be redistributed
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only if accompanied by this unaltered notice. Subject to those
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restrictions, permission is granted to anyone to do anything with
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this package. The copyright holders make no guarantees regarding
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this package, and are not responsible for any damage resulting from
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its use.
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*/
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#ifndef _MONGO_EXCEPT_H_
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#define _MONGO_EXCEPT_H_
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#include <setjmp.h>
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/* always non-zero */
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typedef enum{
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MONGO_EXCEPT_NETWORK=1,
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MONGO_EXCEPT_FIND_ERR
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}mongo_exception_type;
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typedef struct {
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jmp_buf base_handler;
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jmp_buf *penv;
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int caught;
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volatile mongo_exception_type type;
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}mongo_exception_context;
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#define MONGO_TRY MONGO_TRY_GENERIC(conn)
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#define MONGO_CATCH MONGO_CATCH_GENERIC(conn)
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#define MONGO_THROW(e) MONGO_THROW_GENERIC(conn, e)
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#define MONGO_RETHROW() MONGO_RETHROW_GENERIC(conn)
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/* the rest of this file is implementation details */
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/* this is done in mongo_connect */
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#define MONGO_INIT_EXCEPTION(exception_ptr) \
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do{ \
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mongo_exception_type t; /* exception_ptr won't be available */\
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(exception_ptr)->penv = &(exception_ptr)->base_handler; \
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if ((t = setjmp((exception_ptr)->base_handler))) { /* yes, '=' is correct */ \
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switch(t){ \
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case MONGO_EXCEPT_NETWORK: bson_fatal_msg(0, "network error"); \
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case MONGO_EXCEPT_FIND_ERR: bson_fatal_msg(0, "error in find"); \
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default: bson_fatal_msg(0, "unknown exception"); \
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} \
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} \
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}while(0)
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#define MONGO_TRY_GENERIC(connection) \
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{ \
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jmp_buf *exception__prev, exception__env; \
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exception__prev = (connection)->exception.penv; \
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(connection)->exception.penv = &exception__env; \
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if (setjmp(exception__env) == 0) { \
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do
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#define MONGO_CATCH_GENERIC(connection) \
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while ((connection)->exception.caught = 0, \
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(connection)->exception.caught); \
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} \
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else { \
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(connection)->exception.caught = 1; \
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} \
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(connection)->exception.penv = exception__prev; \
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} \
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if (!(connection)->exception.caught ) { } \
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else
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/* Try ends with do, and Catch begins with while(0) and ends with */
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/* else, to ensure that Try/Catch syntax is similar to if/else */
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/* syntax. */
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/* */
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/* The 0 in while(0) is expressed as x=0,x in order to appease */
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/* compilers that warn about constant expressions inside while(). */
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/* Most compilers should still recognize that the condition is always */
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/* false and avoid generating code for it. */
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#define MONGO_THROW_GENERIC(connection, type_in) \
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for (;; longjmp(*(connection)->exception.penv, type_in)) \
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(connection)->exception.type = type_in
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#define MONGO_RETHROW_GENERIC(connection) \
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MONGO_THROW_GENERIC(connection, (connection)->exception.type)
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#endif
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