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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// query.h
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#pragma once
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#include "../stdafx.h"
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#include "../grid/message.h"
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#include "jsobj.h"
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#include "storage.h"
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/* requests:
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dbDelete
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int reserved=0;
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string collection;
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int flags=0; // 1=DeleteSingle
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JSObject query;
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dbUpdate:
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int reserved;
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string collection;
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int flags; // 1=upsert
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JSObject query;
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JSObject objectToUpdate;
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dbQuery:
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int reserved;
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string collection;
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int nToReturn; // how many you want back as the beginning of the cursor data
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JSObject query;
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[JSObject fieldsToReturn]
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dbGetMore:
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int reserved;
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string collection; // redundant, might use for security.
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int nToReturn;
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int64 cursorID;
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Note that on Update, there is only one object, which is different
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from insert where you can pass a list of objects to insert in the db.
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Note that the update field layout is very similar layout to Query.
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*/
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/* db response format
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Query or GetMore:
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int reserved;
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int64 cursorID;
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int startingFrom;
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int nReturned; // 0=infinity
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list of marshalled JSObjects;
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*/
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#pragma pack(push)
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#pragma pack(1)
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struct QueryResult : public MsgData {
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long long cursorId;
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int startingFrom;
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int nReturned;
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const char *data() { return (char *) (((int *)&nReturned)+1); }
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};
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#pragma pack(pop)
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QueryResult* getMore(const char *ns, int ntoreturn, long long cursorid);
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QueryResult* runQuery(const char *ns, int ntoreturn,
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JSObj j, auto_ptr< set<string> > fieldFilter,
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stringstream&);
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void updateObjects(const char *ns, JSObj updateobj, JSObj pattern, bool upsert);
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void deleteObjects(const char *ns, JSObj pattern, bool justOne);
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/* Cursor -- and its derived classes -- are our internal cursors.
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ClientCursor is a wrapper that represents a cursorid from our client
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application's perspective.
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*/
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class Cursor;
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class ClientCursor {
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public:
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ClientCursor() { cursorid=0; pos=0; }
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~ClientCursor();
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long long cursorid;
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string ns;
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auto_ptr<JSMatcher> matcher;
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auto_ptr<Cursor> c;
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int pos;
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DiskLoc lastLoc;
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auto_ptr< set<string> > filter;
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/* report to us that a new clientcursor exists so we can track it. You still
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do the initial updateLocation() yourself.
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*/
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static void add(ClientCursor*);
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/* call when cursor's location changes so that we can update the
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cursorsbylocation map. if you are locked and internally iterating, only
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need to call when you are ready to "unlock".
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*/
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void updateLocation();
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};
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typedef map<long long, ClientCursor*> CCMap;
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extern CCMap clientCursors; /* cursorid -> ClientCursor */
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long long allocCursorId();
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