* refactoring: split src/ into mu/ and lib/
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djcb
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lib/mu-store-priv.hh
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228
lib/mu-store-priv.hh
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/* -*-mode: c++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8-*- */
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/*
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** Copyright (C) 2011 <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by the
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** Free Software Foundation; either version 3, or (at your option) any
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** later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#ifndef __MU_STORE_PRIV_HH__
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#define __MU_STORE_PRIV_HH__
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif /*HAVE_CONFIG_H*/
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#include <cstdio>
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#include <xapian.h>
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#include <cstring>
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#include <stdexcept>
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#include "mu-store.h"
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#include "mu-contacts.h"
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class MuStoreError {
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public:
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MuStoreError (MuError err, const std::string& what) :
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_err (err), _what(what) {}
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MuError mu_error () const { return _err; }
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const std::string& what() const { return _what; }
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private:
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MuError _err;
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const std::string _what;
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};
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struct _MuStore {
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public:
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/* create a read-write MuStore */
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_MuStore (const char *path, const char *contacts_path, bool rebuild) {
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init (path, contacts_path, rebuild, false);
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if (rebuild)
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_db = new Xapian::WritableDatabase
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(path, Xapian::DB_CREATE_OR_OVERWRITE);
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else
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_db = new Xapian::WritableDatabase
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(path, Xapian::DB_CREATE_OR_OPEN);
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check_set_version ();
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if (contacts_path) {
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_contacts = mu_contacts_new (contacts_path);
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if (!_contacts) /* don't bail-out for this */
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throw MuStoreError (MU_ERROR_FILE,
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("failed to init contacts cache"));
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}
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MU_WRITE_LOG ("%s: opened %s (batch size: %u) for read-write",
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__FUNCTION__, this->path(), (unsigned)batch_size());
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}
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/* create a read-only MuStore */
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_MuStore (const char *path) {
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init (path, NULL, false, false);
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_db = new Xapian::Database (path);
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if (mu_store_needs_upgrade(this))
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throw MuStoreError (MU_ERROR_XAPIAN_NOT_UP_TO_DATE,
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("store needs an upgrade"));
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MU_WRITE_LOG ("%s: opened %s read-only", __FUNCTION__, this->path());
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}
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void init (const char *path, const char *contacts_path,
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bool rebuild, bool read_only) {
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_batch_size = DEFAULT_BATCH_SIZE;
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_contacts = 0;
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_in_transaction = false;
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_path = path;
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_processed = 0;
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_read_only = read_only;
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_ref_count = 1;
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_version = NULL;
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}
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void check_set_version () {
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/* check version...*/
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gchar *version;
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version = mu_store_get_metadata (this, MU_STORE_VERSION_KEY, NULL);
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if (!version)
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mu_store_set_metadata (this, MU_STORE_VERSION_KEY,
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MU_STORE_SCHEMA_VERSION, NULL);
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else if (g_strcmp0 (version, MU_STORE_SCHEMA_VERSION) != 0) {
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g_free (version);
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throw MuStoreError (MU_ERROR_XAPIAN_NOT_UP_TO_DATE,
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("store needs an upgrade"));
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} else
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g_free (version);
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}
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~_MuStore () {
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try {
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if (_ref_count != 0)
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g_warning ("ref count != 0");
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g_free (_version);
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mu_contacts_destroy (_contacts);
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if (!_read_only)
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mu_store_flush (this);
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MU_WRITE_LOG ("closing xapian database with %d document(s)",
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(int)db_read_only()->get_doccount());
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delete _db;
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} MU_XAPIAN_CATCH_BLOCK;
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}
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/* close the old database, and write an empty one on top of it */
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void clear () {
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if (is_read_only())
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throw std::runtime_error ("database is read-only");
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// clear the database
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db_writable()->close ();
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delete _db;
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_db = new Xapian::WritableDatabase
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(path(), Xapian::DB_CREATE_OR_OVERWRITE);
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// clear the contacts cache
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if (_contacts)
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mu_contacts_clear (_contacts);
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}
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/* get a unique id for this message; note, this function returns a
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* static buffer -- not reentrant */
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const char *get_uid_term (const char *path);
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MuContacts* contacts() { return _contacts; }
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const char* version () {
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g_free (_version);
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return _version = mu_store_get_metadata (this, MU_STORE_VERSION_KEY,
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NULL);
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}
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void set_version (const char *version) {
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mu_store_set_metadata (this, MU_STORE_VERSION_KEY, version, NULL);
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}
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static unsigned max_term_length() { return MAX_TERM_LENGTH; }
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void begin_transaction ();
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void commit_transaction ();
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void rollback_transaction ();
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Xapian::WritableDatabase* db_writable() {
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if (G_UNLIKELY(is_read_only()))
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throw std::runtime_error ("database is read-only");
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return (Xapian::WritableDatabase*)_db;
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}
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Xapian::Database* db_read_only() const { return _db; }
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const char* path () const { return _path.c_str(); }
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bool is_read_only () const { return _read_only; }
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size_t batch_size () const { return _batch_size;}
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size_t set_batch_size (size_t n) {
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return _batch_size = ( n == 0) ? DEFAULT_BATCH_SIZE : n;
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}
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bool in_transaction () const { return _in_transaction; }
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bool in_transaction (bool in_tx) { return _in_transaction = in_tx; }
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int processed () const { return _processed; }
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int set_processed (int n) { return _processed = n;}
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int inc_processed () { return ++_processed; }
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/* MuStore is ref-counted */
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guint ref () { return ++_ref_count; }
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guint unref () {
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if (_ref_count < 1)
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g_critical ("ref count error");
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return --_ref_count;
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}
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/* by default, use transactions of 30000 messages */
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static const unsigned DEFAULT_BATCH_SIZE = 30000;
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/* http://article.gmane.org/gmane.comp.search.xapian.general/3656 */
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static const unsigned MAX_TERM_LENGTH = 240;
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private:
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/* transaction handling */
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bool _in_transaction;
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int _processed;
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size_t _batch_size; /* batch size of a xapian transaction */
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/* contacts object to cache all the contact information */
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MuContacts *_contacts;
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std::string _path;
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gchar *_version;
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Xapian::Database *_db;
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bool _read_only;
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guint _ref_count;
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};
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#endif /*__MU_STORE_PRIV_HH__*/
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