/*- * 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_ */