/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.ignite.spi.indexing;
import java.util.Collection;
import java.util.Iterator;
import javax.cache.Cache;
import org.apache.ignite.spi.IgniteSpi;
import org.apache.ignite.spi.IgniteSpiException;
import org.jetbrains.annotations.Nullable;
/**
* Indexing SPI allows user to index cache content. Using indexing SPI user can index data in cache and run
* Usually cache name will be used as space name, so multiple caches can write to single indexing SPI instance.
* <p>
* <b>NOTE:</b> this SPI (i.e. methods in this interface) should never be used directly. SPIs provide
* internal view on the subsystem and is used internally by Ignite kernal. In rare use cases when
* access to a specific implementation of this SPI is required - an instance of this SPI can be obtained
* via {@link org.apache.ignite.Ignite#configuration()} method to check its configuration properties or call other non-SPI
* methods. Note again that calling methods from this interface on the obtained instance can lead
* to undefined behavior and explicitly not supported.
*
* <b>NOTE:</b> Key and value arguments of IgniteSpi methods can be {@link org.apache.ignite.binary.BinaryObject} instances.
* BinaryObjects can be deserialized manually if original objects needed.
*
* Here is a Java example on how to configure SPI.
* <pre name="code" class="java">
* IndexingSpi spi = new MyIndexingSpi();
*
* IgniteConfiguration cfg = new IgniteConfiguration();
*
* // Overrides default indexing SPI.
* cfg.setIndexingSpi(spi);
*
* // Starts grid.
* Ignition.start(cfg);
* </pre>
* Here is an example of how to configure SPI from Spring XML configuration file.
* <pre name="code" class="xml">
* <property name="indexingSpi">
* <bean class="com.example.MyIndexingSpi">
* </bean>
* </property>
* </pre>
* <p>
* <img src="http://ignite.apache.org/images/spring-small.png">
* <br>
* For information about Spring framework visit <a href="http://www.springframework.org/">www.springframework.org</a>
*/
public interface IndexingSpi extends IgniteSpi {
/**
* Executes query.
*
* @param spaceName Space name.
* @param params Query parameters.
* @param filters System filters.
* @return Query result. If the iterator implements {@link AutoCloseable} it will be correctly closed.
* @throws IgniteSpiException If failed.
*/
public Iterator<Cache.Entry<?,?>> query(@Nullable String spaceName, Collection<Object> params,
@Nullable IndexingQueryFilter filters) throws IgniteSpiException;
/**
* Updates index. Note that key is unique for space, so if space contains multiple indexes
* the key should be removed from indexes other than one being updated.
*
* @param spaceName Space name.
* @param key Key.
* @param val Value.
* @param expirationTime Expiration time or 0 if never expires.
* @throws IgniteSpiException If failed.
*/
public void store(@Nullable String spaceName, Object key, Object val, long expirationTime) throws IgniteSpiException;
/**
* Removes index entry by key.
*
* @param spaceName Space name.
* @param key Key.
* @throws IgniteSpiException If failed.
*/
public void remove(@Nullable String spaceName, Object key) throws IgniteSpiException;
}