| /* |
| * 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.datacache; |
| |
| import java.util.Objects; |
| |
| import org.apache.openjpa.kernel.QueryStatistics; |
| import org.apache.openjpa.util.RuntimeExceptionTranslator; |
| |
| /** |
| * Delegating query cache that can also perform exception translation for |
| * use in facades. This cache allows its delegate to be null, in which case |
| * it returns default values or all methods. |
| * |
| * @author Abe White |
| * @since 0.4.0 |
| */ |
| public class DelegatingQueryCache |
| implements QueryCache { |
| |
| private final QueryCache _cache; |
| private final DelegatingQueryCache _del; |
| private final RuntimeExceptionTranslator _trans; |
| |
| /** |
| * Constructor. Supply delegate. |
| */ |
| public DelegatingQueryCache(QueryCache cache) { |
| this(cache, null); |
| } |
| |
| public DelegatingQueryCache(QueryCache cache, |
| RuntimeExceptionTranslator trans) { |
| _cache = cache; |
| _trans = trans; |
| if (cache instanceof DelegatingQueryCache) |
| _del = (DelegatingQueryCache) _cache; |
| else |
| _del = null; |
| } |
| |
| /** |
| * Return the direct delegate. |
| */ |
| public QueryCache getDelegate() { |
| return _cache; |
| } |
| |
| /** |
| * Return the native delegate. |
| */ |
| public QueryCache getInnermostDelegate() { |
| return (_del == null) ? _cache : _del.getInnermostDelegate(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return getInnermostDelegate().hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (other == this) |
| return true; |
| if (other instanceof DelegatingQueryCache) |
| other = ((DelegatingQueryCache) other).getInnermostDelegate(); |
| return Objects.equals(getInnermostDelegate(), other); |
| } |
| |
| /** |
| * Translate the OpenJPA exception. |
| */ |
| protected RuntimeException translate(RuntimeException re) { |
| return (_trans == null) ? re : _trans.translate(re); |
| } |
| |
| @Override |
| public void initialize(DataCacheManager mgr) { |
| if (_cache == null) |
| return; |
| try { |
| _cache.initialize(mgr); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void onTypesChanged(TypesChangedEvent e) { |
| if (_cache == null) |
| return; |
| try { |
| _cache.onTypesChanged(e); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public QueryResult get(QueryKey qk) { |
| if (_cache == null) |
| return null; |
| try { |
| return _cache.get(qk); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public QueryResult put(QueryKey qk, QueryResult oids) { |
| if (_cache == null) |
| return null; |
| try { |
| return _cache.put(qk, oids); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public QueryResult remove(QueryKey qk) { |
| if (_cache == null) |
| return null; |
| try { |
| return _cache.remove(qk); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void clear() { |
| if (_cache == null) |
| return; |
| try { |
| _cache.clear(); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public boolean pin(QueryKey qk) { |
| if (_cache == null) |
| return false; |
| try { |
| return _cache.pin(qk); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public boolean unpin(QueryKey qk) { |
| if (_cache == null) |
| return false; |
| try { |
| return _cache.unpin(qk); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void writeLock() { |
| if (_cache == null) |
| return; |
| try { |
| _cache.writeLock(); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void writeUnlock() { |
| if (_cache == null) |
| return; |
| try { |
| _cache.writeUnlock(); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void addTypesChangedListener(TypesChangedListener listen) { |
| if (_cache == null) |
| return; |
| try { |
| _cache.addTypesChangedListener(listen); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public boolean removeTypesChangedListener(TypesChangedListener listen) { |
| if (_cache == null) |
| return false; |
| try { |
| return _cache.removeTypesChangedListener(listen); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public void close() { |
| if (_cache == null) |
| return; |
| try { |
| _cache.close(); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| |
| @Override |
| public QueryStatistics<QueryKey> getStatistics() { |
| if (_cache == null) |
| return null; |
| try { |
| return _cache.getStatistics(); |
| } catch (RuntimeException re) { |
| throw translate(re); |
| } |
| } |
| } |