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KernelAPI.java
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KernelAPI.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.api.proc.Procedure;
/**
* The main API through which access to the Neo4j kernel is made, both read
* and write operations are supported as well as creating transactions.
*
* Changes to the graph (i.e. write operations) are performed via a
* {@link #newTransaction() transaction context} where changes done
* inside the transaction are visible in read operations for {@link Statement statements}
* executed within that transaction context.
*/
public interface KernelAPI
{
/**
* Creates and returns a new {@link KernelTransaction} capable of modifying the
* underlying graph.
*/
KernelTransaction newTransaction() throws TransactionFailureException;
/**
* Registers a {@link TransactionHook} that will receive notifications about committing transactions
* and the changes they commit.
* @param hook {@link TransactionHook} for receiving notifications about transactions to commit.
*/
void registerTransactionHook( TransactionHook hook );
/**
* Unregisters an already registered {@link TransactionHook} so that it will no longer receive notifications
* about transactions.
* @param hook {@link TransactionHook} to unregister.
*/
void unregisterTransactionHook( TransactionHook hook );
/**
* Register a procedure that should be available from this kernel. This is not a transactional method, the procedure is not
* durably stored, and is not propagated in a cluster.
*
* @param signature signature of the procedure
*/
void registerProcedure( Procedure signature ) throws ProcedureException;
}