2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.context;
25 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
26 import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
27 import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
30 * This interface is implemented by plugin classes that persist Context Albums in Apex.
32 * @author Liam Fallon (liam.fallon@ericsson.com)
34 public interface Persistor {
37 * Initialize the persistor with its properties.
39 * @param key The key that identifies this persistor
40 * @throws ContextException On errors initializing the persistor
42 void init(AxArtifactKey key) throws ContextException;
45 * Get the key of the persistor.
47 * @return the contextSetKey
49 AxArtifactKey getKey();
52 * Read a context item from the persistence mechanism.
54 * @param key the key of the context item
55 * @param contextItemClassName the name of the context item class, a subclass of {@link AxContextSchema}
56 * @return the context item that has been read
57 * @throws ContextException on persistence read errors
59 AxContextSchema readContextItem(AxReferenceKey key, Class<?> contextItemClassName) throws ContextException;
62 * Read all the values of a particular type from persistence.
64 * @param ownerKey the owner key
65 * @param contextItemClassName The class name of the objects to return
66 * @return the set of context item values read from persistence or null if none were found
67 * @throws ContextException On read errors
69 Set<AxContextSchema> readContextItems(AxArtifactKey ownerKey, Class<?> contextItemClassName)
70 throws ContextException;
73 * Write a context item value to the persistence mechanism.
75 * @param contextItem the context item
76 * @return the context item that has been written
78 Object writeContextItem(Object contextItem);