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/* Copyright (c) 2009, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef OVSDB_TRIGGER_H
#define OVSDB_TRIGGER_H 1
#include "openvswitch/list.h"
struct ovsdb;
/* Triggers have the following states:
*
* - Initialized (reply == NULL, progress == NULL): Executing the trigger
* can keep it in the initialized state, if it has a "wait" condition that
* isn't met. Executing the trigger can also yield an error, in which
* case it transitions to "complete". Otherwise, execution yields a
* transaction, which the database attempts to commit. If the transaction
* completes immediately and synchronously, then the trigger transitions
* to the "complete" state. If the transaction requires some time to
* complete, it transitions to the "committing" state.
*
* - Committing (reply != NULL, progress != NULL): The transaction is
* committing. If it succeeds, or if it fails permanently, then the
* trigger transitions to "complete". If it fails temporarily
* (e.g. because someone else committed to cluster-based storage before we
* did), then we transition back to "initialized" to try again.
*
* - Complete (reply != NULL, progress == NULL): The transaction is done
* and either succeeded or failed.
*/
struct ovsdb_trigger {
/* In "initialized" or "committing" state, in db->triggers.
* In "complete", in session->completions. */
struct ovs_list node;
struct ovsdb_session *session; /* Session that owns this trigger. */
struct ovsdb *db; /* Database on which trigger acts. */
struct jsonrpc_msg *request; /* Database request. */
struct jsonrpc_msg *reply; /* Result (null if none yet). */
struct ovsdb_txn_progress *progress;
long long int created; /* Time created. */
long long int timeout_msec; /* Max wait duration. */
bool read_only; /* Database is in read only mode. */
char *role; /* Role, for role-based access controls. */
char *id; /* ID, for role-based access controls. */
};
bool ovsdb_trigger_init(struct ovsdb_session *, struct ovsdb *,
struct ovsdb_trigger *,
struct jsonrpc_msg *request, long long int now,
bool read_only, const char *role, const char *id);
void ovsdb_trigger_destroy(struct ovsdb_trigger *);
bool ovsdb_trigger_is_complete(const struct ovsdb_trigger *);
struct jsonrpc_msg *ovsdb_trigger_steal_reply(struct ovsdb_trigger *);
void ovsdb_trigger_cancel(struct ovsdb_trigger *, const char *reason);
void ovsdb_trigger_prereplace_db(struct ovsdb_trigger *);
bool ovsdb_trigger_run(struct ovsdb *, long long int now);
void ovsdb_trigger_wait(struct ovsdb *, long long int now);
#endif /* ovsdb/trigger.h */
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