jk_msg.h

Tomcat 4.1与WebServer集成组件的源代码包.

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 *                 The Apache Software License,  Version 1.1                 *
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 *    must include the following acknowlegement:                             *
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#ifndef JK_REQ_H
#define JK_REQ_H

#include "jk_global.h"
#include "jk_env.h"
#include "jk_logger.h"
#include "jk_pool.h"
#include "jk_endpoint.h"
#include "jk_service.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

struct jk_env;
struct jk_msg;
typedef struct jk_msg jk_msg_t;

struct jk_endpoint;
struct jk_ws_service;
struct jk_logger;
    
#define DEF_BUFFER_SZ (8*1024)
#define AJP13_MAX_SEND_BODY_SZ      (DEF_BUFFER_SZ - 6)
    
/**
 * Abstract interface to marshalling. Different encodings and
 * communication mechanisms can be supported.
 *
 * This object is recyclable, but is not thread safe - it can
 * handle a single message at a time.
 *
 * It is created by a channel( XXX endpoint ? )
 * and can be sent/received only on that channel.
 *
 * XXX Lifecycle: on send the buffer will be reused after send
 *     On receive - it will be recycled after reset() or equiv.
 *     Same as on the java side.
 *
 * @author Costin Manolache
 */
struct jk_msg {
    /** Human-readable method name */
    char *name;

    /** Method id - to be sent in the packet
     */
    int id;

    /** Header length for this message
     */
    int headerLength;
    
    /*
     * Prepare the buffer for a new invocation 
     */
    void (*reset)(struct jk_env *env, struct jk_msg *_this);

    /*
     * Finalize the buffer before sending - set length fields, etc
     */
    void (*end)(struct jk_env *env, struct jk_msg *_this);

    int (*checkHeader)(struct jk_env *env, struct jk_msg *_this,
                        struct jk_endpoint *e);

    /*
     * Dump the buffer header
     *   @param err Message text
     */
    void (*dump)(struct jk_env *env, struct jk_msg *_this, char *err);

    int (*appendByte)(struct jk_env *env, struct jk_msg *_this, unsigned char val);
    
    int (*appendBytes)(struct jk_env *env, struct jk_msg *_this, 
                       const unsigned char * param,
                       const int len);

    int (*appendInt)(struct jk_env *env, struct jk_msg *_this, 
                     const unsigned short val);

    int (*appendLong)(struct jk_env *env, struct jk_msg *_this, 
                       const unsigned long val);

    int (*appendString)(struct jk_env *env, struct jk_msg *_this, 
                         const char *param);

    int (*appendAsciiString)(struct jk_env *env, struct jk_msg *_this, 
                             const char *param);

    int (*appendMap)(struct jk_env *env, struct jk_msg *_this, 
                     struct jk_map *map);

    unsigned char (*getByte)(struct jk_env *env, struct jk_msg *_this);

    unsigned short (*getInt)(struct jk_env *env, struct jk_msg *_this);

    /** Look at the next int, without reading it
     */
    unsigned short (*peekInt)(struct jk_env *env, struct jk_msg *_this);

    unsigned long (*getLong)(struct jk_env *env, struct jk_msg *_this);

    /** Return a string. 
        The buffer is internal to the message, you must save
        or make sure the message lives long enough.
     */ 
    char *(*getString)(struct jk_env *env, struct jk_msg *_this);

    /** Return a byte[] and it's length.
     *  The buffer is internal to the message, you must save
     * or make sure the message lives long enough.
     */ 
    unsigned char *(*getBytes)(struct jk_env *env,
                               struct jk_msg *_this,
                               int *len);

    /** Read a map structure from the message. The map is encoded
     *  as an int count and then the NV pairs.
     *
     *  The content will not be copied - but point to the msg's buffer.
     *  If you want to use the map after the msg becomes invalid, you need
     *  to copy it.
     */
    int (*getMap)(struct jk_env *env, struct jk_msg *_this, 
                  struct jk_map *map);

    /** 
     * Special method. Will read data from the server and add them as
     * bytes. It is equivalent with jk2_requtil_readFully() in a buffer
     * and then jk_msg_appendBytes(), except that we use directly the
     * internal buffer.
     *
     * Returns -1 on error, else number of bytes read
     */
    int (*appendFromServer)(struct jk_env *env,
                            struct jk_msg *_this,
                            struct jk_ws_service *r,
                            struct jk_endpoint  *ae,
                            int            len );

    void *_privatePtr;
    
    /* Temporary, don't use */
    struct jk_pool *pool;
    
    unsigned char *buf;
    int pos; 
    int len;
    int maxlen;

    /* JK_TRUE if the message is sent/received by the server ( tomcat ).
     */
    int serverSide;
};

/* Temp */
jk_msg_t *jk2_msg_ajp_create(struct jk_env *env, struct jk_pool *p,
                            int buffSize);
    
jk_msg_t *jk2_msg_ajp_create2(struct jk_env *env, struct jk_pool *pool,
                              char *buf, int buffSize);
    
#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif