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/*
 * Copyright (C) 2004 - 2014 Brian McCallister
 *
 * 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.
 */
package org.skife.jdbi.v2.tweak;

import org.skife.jdbi.v2.Handle;
import org.skife.jdbi.v2.TransactionCallback;
import org.skife.jdbi.v2.TransactionIsolationLevel;

/**
 * Interface which defines callbacks to be used when transaction methods are called on a handle.
 * Used by specifying on an IDBI instance. All Handle instances
 * opened from that IDBI will use the handler specified.
 * 
 * The default implementation, ConnectionTransactionHandler, explicitely manages
 * the transactions on the underlying JDBC Connection.
 */
public interface TransactionHandler
{
    /**
     * Called when a transaction is started
     */
    void begin(Handle handle); // TODO consider having this return a TransactionStatus

    /**
     * Called when a transaction is committed
     */
    void commit(Handle handle);

    /**
     * Called when a transaction is rolled back
     */
    void rollback(Handle handle);

    /**
     * Roll back to a named checkpoint
     * @param handle the handle the rollback is being performed on
     * @param name the name of the checkpoint to rollback to
     */
    void rollback(Handle handle, String name);

    /**
     * Called to test if a handle is in a transaction
     */
    boolean isInTransaction(Handle handle);

    /**
     * Create a new checkpoint (savepoint in JDBC terminology)
     *
     * @param handle the handle on which the transaction is being checkpointed
     * @param name The name of the chckpoint, used to rollback to or release late
     */
    void checkpoint(Handle handle, String name);

    /**
     * Release a previously created checkpoint
     *
     * @param handle the handle on which the checkpoint is being released
     * @param checkpointName the checkpoint to release
     */
    void release(Handle handle, String checkpointName);

    /**
     * Run a transaction.
     * @see Handle#inTransaction(TransactionCallback)
     */
     ReturnType inTransaction(Handle handle, TransactionCallback callback);

    /**
     * Run a transaction.
     * @see Handle#inTransaction(TransactionIsolationLevel, TransactionCallback)
     */
     ReturnType inTransaction(Handle handle, TransactionIsolationLevel level, TransactionCallback callback);

}