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/*
* 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.rya.indexing.mongodb.update;
import java.util.Optional;
import org.apache.rya.api.domain.RyaIRI;
import org.apache.rya.indexing.mongodb.IndexingException;
/**
* Stores and provides access to objects of type T.
* The {@link RyaIRI} subject is the primary storage key used.
* @param <T> - The type of object to store/access.
*/
public interface RyaObjectStorage<T> {
/**
* Creates a new {@link RyaObjectStorage#T} within the storage. The new object's subject must be unique.
*
* @param obj - The {@link RyaObjectStorage#T} to create. (not null)
* @throws ObjectAlreadyExistsException An Object could not be created because one already exists for the Subject.
* @throws ObjectStorageException A problem occurred while creating the Object.
*/
public void create(T doc) throws ObjectAlreadyExistsException, ObjectStorageException;
/**
* Get an Object from the storage by its subject.
*
* @param subject - Identifies which Object to get. (not null)
* @return The Object if one exists for the subject.
* @throws ObjectStorageException A problem occurred while fetching the Object from the storage.
*/
public Optional<T> get(RyaIRI subject) throws ObjectStorageException;
/**
* Update the state of an {@link RyaObjectStorage#T}.
*
* @param old - The Object the changes were applied to. (not null)
* @param updated - The updated Object to store. (not null)
* @throws StaleUpdateException The {@code old} Object does not match any that are stored.
* @throws ObjectStorageException A problem occurred while updating the Object within the storage.
*/
public void update(T old, T updated) throws StaleUpdateException, ObjectStorageException;
/**
* Deletes an {@link RyaObjectStorage#T} from the storage.
*
* @param subject -Identifies which {@link RyaObjectStorage#T} to delete. (not null)
* @return {@code true} if something was deleted; otherwise {@code false}.
* @throws ObjectStorageException A problem occurred while deleting from the storage.
*/
public boolean delete(RyaIRI subject) throws ObjectStorageException;
/**
* Indicates a problem while interacting with an {@link RyaObjectStorage}.
*/
public static class ObjectStorageException extends IndexingException {
private static final long serialVersionUID = 1L;
/**
* Constructs a new exception with the specified detail message. The
* cause is not initialized, and may subsequently be initialized by
* a call to {@link #initCause}.
*
* @param message the detail message. The detail message is saved for
* later retrieval by the {@link #getMessage()} method.
*/
public ObjectStorageException(final String message) {
super(message);
}
/**
* Constructs a new exception with the specified detail message and
* cause. <p>Note that the detail message associated with
* {@code cause} is <i>not</i> automatically incorporated in
* this exception's detail message.
*
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
* @param cause the cause (which is saved for later retrieval by the
* {@link #getCause()} method). (A <tt>null</tt> value is
* permitted, and indicates that the cause is nonexistent or
* unknown.)
*/
public ObjectStorageException(final String message, final Throwable cause) {
super(message, cause);
}
}
/**
* An {@link RyaObjectStorage#T} could not be created because one already exists for the Subject.
*/
public static class ObjectAlreadyExistsException extends ObjectStorageException {
private static final long serialVersionUID = 1L;
public ObjectAlreadyExistsException(final String message) {
super(message);
}
public ObjectAlreadyExistsException(final String message, final Throwable cause) {
super(message, cause);
}
}
/**
* An object could not be updated because the old state does not
* match the current state.
*/
public static class StaleUpdateException extends ObjectStorageException {
private static final long serialVersionUID = 1L;
public StaleUpdateException(final String message) {
super(message);
}
public StaleUpdateException(final String message, final Throwable cause) {
super(message, cause);
}
}
}