java_info.h
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上传日期:2007-04-14
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- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- *
- * $Id: java_info.h,v 11.17 2000/07/31 20:28:30 dda Exp $
- */
- #ifndef _JAVA_INFO_H_
- #define _JAVA_INFO_H_
- /*
- * "Info" classes for Java implementation of Berkeley DB API.
- * These classes hold extra information for which there is
- * no room or counterpart in the base classes used in the C API.
- * In the case of a DBT, the DBT_javainfo class is stored in the
- * 'private' variable of the java Dbt, and the DBT_javainfo is subclassed
- * from a DBT. In the case of DB and DB_ENV, the appropriate
- * info objects are pointed to by the DB and DB_ENV objects.
- * This is convenient to implement callbacks.
- */
- /****************************************************************
- *
- * Declaration of class DBT_javainfo
- *
- * A DBT_javainfo is created whenever a Dbt (java) object is created,
- * and a pointer to it is stored in its private info storage.
- * It is subclassed from DBT, because we must retain some extra
- * information in it while it is in use. In particular, when
- * a java array is associated with it, we need to keep a Globally
- * Locked reference to it so it is not GC'd. This reference is
- * destroyed when the Dbt is GC'd.
- */
- typedef struct _dbt_javainfo
- {
- DBT dbt;
- DB *db_; /* associated DB */
- jobject dbtref_; /* the java Dbt object */
- jbyteArray array_;
- int offset_;
- int create_array_; /* flag to create the array as needed */
- }
- DBT_JAVAINFO; /* used with all 'dbtji' functions */
- extern DBT_JAVAINFO *dbjit_construct();
- extern void dbjit_release(DBT_JAVAINFO *dbjit, JNIEnv *jnienv);
- /****************************************************************
- *
- * Declaration of class DB_ENV_JAVAINFO
- *
- * A DB_ENV_JAVAINFO is allocated and stuffed into the cj_internal
- * and the db_errpfx for every DB_ENV created. It holds a
- * little extra info that is needed to support callbacks.
- *
- * There's a bit of trickery here, because we have built this
- * above a layer that has a C function callback that gets
- * invoked when an error occurs. One of the C callback's arguments
- * is the prefix from the DB_ENV, but since we stuffed a pointer
- * to our own DB_ENV_JAVAINFO into the prefix, we get that object as an
- * argument to the C callback. Thus, the C callback can have
- * access to much more than just the prefix, and it needs that
- * to call back into the Java enviroment.
- *
- * The DB_ENV_JAVAINFO object holds a copy of the Java Virtual Machine,
- * which is needed to attach to the current running thread
- * whenever we need to make a callback. (This is more reliable
- * than our previous approach, which was to save the thread
- * that created the DbEnv). It also has the Java callback object,
- * as well as a 'default' callback object that is used when the
- * caller sets the callback to null. It also has the original
- * error prefix, since we overwrote the one in the DB_ENV.
- * There are also fields that are unrelated to the handling
- * of callbacks, but are convenient to attach to a DB_ENV.
- *
- * Note: We assume that the Java layer is the only one
- * fiddling with the contents of db_errpfx, db_errcall, cj_internal
- * for a DB_ENV that was created via Java. Since the Java layer should
- * have the only pointer to such a DB_ENV, this should be true.
- */
- typedef struct _db_env_javainfo
- {
- JavaVM *javavm_;
- int is_dbopen_;
- char *errpfx_;
- jobject jdbref_; /* temporary reference */
- jobject jenvref_; /* temporary reference */
- jobject default_errcall_; /* global reference */
- jobject errcall_; /* global reference */
- jobject feedback_; /* global reference */
- jobject tx_recover_; /* global reference */
- jobject recovery_init_; /* global reference */
- unsigned char *conflict_;
- }
- DB_ENV_JAVAINFO; /* used with all 'dbjie' functions */
- /* create/initialize an object */
- extern DB_ENV_JAVAINFO *dbjie_construct(JNIEnv *jnienv,
- jobject default_errcall,
- int is_dbopen);
- /* release all objects held by this this one */
- extern void dbjie_dealloc(DB_ENV_JAVAINFO *, JNIEnv *jnienv);
- /* free this object, releasing anything allocated on its behalf */
- extern void dbjie_destroy(DB_ENV_JAVAINFO *, JNIEnv *jnienv);
- /* This gets the environment for the current thread */
- extern JNIEnv *dbjie_get_jnienv(DB_ENV_JAVAINFO *);
- extern void dbjie_set_errpfx(DB_ENV_JAVAINFO *, JNIEnv *jnienv,
- jstring errpfx);
- extern jstring dbjie_get_errpfx(DB_ENV_JAVAINFO *, JNIEnv *jnienv);
- extern void dbjie_set_errcall(DB_ENV_JAVAINFO *, JNIEnv *jnienv,
- jobject new_errcall);
- extern void dbjie_set_conflict(DB_ENV_JAVAINFO *, unsigned char *v);
- extern void dbjie_set_feedback_object(DB_ENV_JAVAINFO *, JNIEnv *jnienv,
- DB_ENV *dbenv, jobject value);
- extern void dbjie_call_feedback(DB_ENV_JAVAINFO *, DB_ENV *dbenv, jobject jenv,
- int opcode, int percent);
- extern void dbjie_set_recovery_init_object(DB_ENV_JAVAINFO *, JNIEnv *jnienv,
- DB_ENV *dbenv, jobject value);
- extern int dbjie_call_recovery_init(DB_ENV_JAVAINFO *, DB_ENV *dbenv,
- jobject jenv);
- extern void dbjie_set_tx_recover_object(DB_ENV_JAVAINFO *, JNIEnv *jnienv,
- DB_ENV *dbenv, jobject value);
- extern int dbjie_call_tx_recover(DB_ENV_JAVAINFO *,
- DB_ENV *dbenv, jobject jenv,
- DBT *dbt, DB_LSN *lsn, int recops);
- extern jobject dbjie_get_errcall(DB_ENV_JAVAINFO *) ;
- extern int dbjie_is_dbopen(DB_ENV_JAVAINFO *);
- /****************************************************************
- *
- * Declaration of class DB_JAVAINFO
- *
- * A DB_JAVAINFO is allocated and stuffed into the cj_internal field
- * for every DB created. It holds a little extra info that is needed
- * to support callbacks.
- *
- * Note: We assume that the Java layer is the only one
- * fiddling with the contents of cj_internal
- * for a DB that was created via Java. Since the Java layer should
- * have the only pointer to such a DB, this should be true.
- */
- typedef struct _db_javainfo
- {
- JavaVM *javavm_;
- jobject jdbref_; /* temporary reference during callback */
- jobject feedback_; /* global reference */
- jobject append_recno_; /* global reference */
- jobject bt_compare_; /* global reference */
- jobject bt_prefix_; /* global reference */
- jobject dup_compare_; /* global reference */
- jobject h_hash_; /* global reference */
- jmethodID feedback_method_id_;
- jmethodID append_recno_method_id_;
- jmethodID bt_compare_method_id_;
- jmethodID bt_prefix_method_id_;
- jmethodID dup_compare_method_id_;
- jmethodID h_hash_method_id_;
- jint construct_flags_;
- } DB_JAVAINFO;
- /* create/initialize an object */
- extern DB_JAVAINFO *dbji_construct(JNIEnv *jnienv, jint flags);
- /* release all objects held by this this one */
- extern void dbji_dealloc(DB_JAVAINFO *, JNIEnv *jnienv);
- /* free this object, releasing anything allocated on its behalf */
- extern void dbji_destroy(DB_JAVAINFO *, JNIEnv *jnienv);
- /* This gets the environment for the current thread */
- extern JNIEnv *dbji_get_jnienv();
- extern jint dbji_get_flags();
- extern void dbji_set_feedback_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern void dbji_call_feedback(DB_JAVAINFO *, DB *db, jobject jdb,
- int opcode, int percent);
- extern void dbji_set_append_recno_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern int dbji_call_append_recno(DB_JAVAINFO *, DB *db, jobject jdb,
- DBT *dbt, jint recno);
- extern void dbji_set_bt_compare_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern int dbji_call_bt_compare(DB_JAVAINFO *, DB *db, jobject jdb,
- const DBT *dbt1, const DBT *dbt2);
- extern void dbji_set_bt_prefix_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern size_t dbji_call_bt_prefix(DB_JAVAINFO *, DB *db, jobject jdb,
- const DBT *dbt1, const DBT *dbt2);
- extern void dbji_set_dup_compare_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern int dbji_call_dup_compare(DB_JAVAINFO *, DB *db, jobject jdb,
- const DBT *dbt1, const DBT *dbt2);
- extern void dbji_set_h_hash_object(DB_JAVAINFO *, JNIEnv *jnienv, DB *db, jobject value);
- extern int dbji_call_h_hash(DB_JAVAINFO *, DB *db, jobject jdb,
- const void *data, int len);
- #endif /* !_JAVA_INFO_H_ */