/*
* Copyright 2004-2006 the original author or authors.
*
* 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.compass.gps;
/**
* A Compass Gps Device is responsible for interacting with a data source and
* reflecting it in a compass index. A data source can be a file system, or a
* database through the use of ORM tool (like hibernate).
*
* <p>A device should be able to provide the ability to index the data source,
* which usually means iterating through the device data and indexing it. It
* might also provide "real time" monitoring of changes in the device, and
* applying them to the index as well.
*
* <p>A CompassGpsDevice can not operate as a standalone, and must be a part of a
* {@link org.compass.gps.CompassGps} instance (even if we have only one
* device), since the device requires the Compass and the Batch Compass
* instances in order to apply the changes to the index.
*
* <p>The device has a name associated with it, and the name must be unique among
* all the devices within a single CompassGps instance.
*
* @author kimchy
*/
public interface CompassGpsDevice {
/**
* Returns the name associated with the device.
*
* @return The name of the device.
*/
String getName();
/**
* Sets the name associated with the device.
*/
void setName(String name);
/**
* Sets the CompassGps that manages the device. Optional, since if the
* device is added to a CompassGps instance, it will be done automatically.
*/
void injectGps(CompassGps compassGps);
/**
* Returns the CompassGps that manages the device.
*
* @return compassGps
*/
CompassGps getGps();
/**
* Starts the device. Optional, since it is preferable to manage the all the
* devices through the CompassGps API.
*
* @throws CompassGpsException
*/
void start() throws CompassGpsException;
/**
* Stops the device. Optional, since it is preferable to manage the all the
* devices through the CompassGps API.
*
* @throws CompassGpsException
*/
void stop() throws CompassGpsException;
/**
* Returns if the device is running.
*
* @return <code>true</code> if theh device is running
*/
boolean isRunning();
/**
* Index the device. Optional, since it is preferable to manage the all the
* devices through the CompassGps API.
*
* @throws CompassGpsException
* @throws IllegalStateException
*/
void index() throws CompassGpsException, IllegalStateException;
/**
* Retuns <code>true</code> if the devide performs the index operaiton.
*/
public boolean isPerformingIndexOperation();
/**
* Returns <code>true</code> if the device is required to perform mirror operation.
*/
boolean shouldMirrorDataChanges();
}
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