| /* |
| * 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); |
| } |
| } |
| } |