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UpdatePuller.java
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UpdatePuller.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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.ha;
/**
* Puller of transactions updates from a different store. Pulls for updates and applies them into a current store.
* <p>
* On a running instance of a store there should be only one active implementation of this interface.
* <p>
*
* @see SlaveUpdatePuller
* @see MasterUpdatePuller
*/
public interface UpdatePuller
{
/**
* Pull all available updates.
*
* @throws InterruptedException in case if interrupted while waiting for updates
*/
void pullUpdates() throws InterruptedException;
/**
* Try to pull all updates
*
* @return true if all updates pulled, false if updater fail on update retrieval
* @throws InterruptedException in case if interrupted while waiting for updates
*/
boolean tryPullUpdates() throws InterruptedException;
/**
* Start update pulling
*/
void start();
/**
* Terminate update pulling
*/
void stop();
/**
* Pull updates and waits for the supplied condition to be
* fulfilled as part of the update pulling happening.
*
* @param condition {@link UpdatePuller.Condition} to wait for.
* @param assertPullerActive if {@code true} then observing an inactive update puller
* will throw an {@link IllegalStateException},
* @throws InterruptedException if we were interrupted while awaiting the condition.
* @throws IllegalStateException if {@code strictlyAssertActive} and the update puller
* became inactive while awaiting the condition.
*/
void pullUpdates( Condition condition, boolean assertPullerActive ) throws InterruptedException;
/**
* Condition to be meet during update pulling.
*/
interface Condition
{
boolean evaluate( int currentTicket, int targetTicket );
}
}