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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.context.impl.persistence.ephemeral;
import java.util.Set;
import java.util.TreeSet;
import org.onap.policy.apex.context.ContextException;
import org.onap.policy.apex.context.Persistor;
import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
/**
* This class acts as an "in memory" persistor for a single JVM. It just initiates stubs the Persistor interface and
* does not persist anything.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class EphemeralPersistor implements Persistor {
// The key of this persistor
private AxArtifactKey key;
/**
* {@inheritDoc}.
*/
@Override
public void init(final AxArtifactKey persistorKey) throws ContextException {
this.key = persistorKey;
}
/**
* {@inheritDoc}.
*/
@Override
public AxArtifactKey getKey() {
return key;
}
/**
* {@inheritDoc}.
*/
@Override
public AxContextSchema readContextItem(final AxReferenceKey itemKey, final Class<?> contextItemClass) {
// Can't read from this persistor as nothing is persisted
return null;
}
/**
* {@inheritDoc}.
*/
@Override
public Set<AxContextSchema> readContextItems(final AxArtifactKey ownerKey, final Class<?> contextItemClass)
throws ContextException {
// No reading from persistence on the Ephemeral persistor, return an empty set
return new TreeSet<>();
}
/**
* {@inheritDoc}.
*/
@Override
public Object writeContextItem(final Object contextItem) {
// No writing to persistence on the Ephemeral persistor
return contextItem;
}
}
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