org.apache.openjpa.slice.SlicePersistence Maven / Gradle / Ivy
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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.openjpa.slice;
import java.util.Arrays;
import org.apache.openjpa.enhance.PersistenceCapable;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.util.ImplHelper;
/**
* A helper to determine the slice identifier of an instance.
*
* @author Pinaki Poddar
*
*/
public class SlicePersistence {
/**
* The key for setting the Query hints. The value is comma-separated Slice
* names. If the hint is specified then the query is executed only on the
* listed slices.
*/
public static final String HINT_TARGET = ProductDerivation.HINT_TARGET;
/**
* Get the slice identifier for the given instance if it is a managed
* instance and has been assigned to a slice.
* If the given instance is replicated across multiple slices then returns
* comma-separated list of slice names.
*
* @return name of the slice, if any. null otherwise.
*/
public static String getSlice(Object obj) {
if (obj == null)
return null;
PersistenceCapable pc = ImplHelper.toPersistenceCapable(obj, null);
if (pc == null)
return null;
OpenJPAStateManager sm = (OpenJPAStateManager)pc.pcGetStateManager();
SliceInfo info = SliceImplHelper.getSliceInfo(sm);
if (info == null)
return null;
String[] names = info.getSlices();
return info.isReplicated() ? Arrays.toString(names) : names[0];
}
/**
* Affirms if the given instance is replicated, provided the given instance
* is managed.
*/
public static boolean isReplicated(Object obj) {
if (obj == null)
return false;
PersistenceCapable pc = ImplHelper.toPersistenceCapable(obj, null);
if (pc == null)
return false;
OpenJPAStateManager sm = (OpenJPAStateManager)pc.pcGetStateManager();
SliceInfo info = SliceImplHelper.getSliceInfo(sm);
if (info == null)
return false;
return info.isReplicated();
}
}