| /* |
| * 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.ignite.cache.spring; |
| |
| import java.io.Serializable; |
| import java.util.concurrent.Callable; |
| import org.apache.ignite.IgniteCache; |
| import org.apache.ignite.IgniteLock; |
| import org.springframework.cache.Cache; |
| import org.springframework.cache.support.SimpleValueWrapper; |
| |
| /** |
| * Spring cache implementation. |
| */ |
| class SpringCache implements Cache { |
| /** */ |
| private static final Object NULL = new NullValue(); |
| |
| /** */ |
| private final IgniteCache<Object, Object> cache; |
| |
| /** */ |
| private final SpringCacheManager mgr; |
| |
| /** |
| * @param cache Cache. |
| * @param mgr Manager |
| */ |
| SpringCache(IgniteCache<Object, Object> cache, SpringCacheManager mgr) { |
| assert cache != null; |
| |
| this.cache = cache; |
| this.mgr = mgr; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String getName() { |
| return cache.getName(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public Object getNativeCache() { |
| return cache; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ValueWrapper get(Object key) { |
| Object val = cache.get(key); |
| |
| return val != null ? fromValue(val) : null; |
| } |
| |
| /** {@inheritDoc} */ |
| @SuppressWarnings("unchecked") |
| @Override public <T> T get(Object key, Class<T> type) { |
| Object val = cache.get(key); |
| |
| if (NULL.equals(val)) |
| val = null; |
| |
| if (val != null && type != null && !type.isInstance(val)) |
| throw new IllegalStateException("Cached value is not of required type [cacheName=" + cache.getName() + |
| ", key=" + key + ", val=" + val + ", requiredType=" + type + ']'); |
| |
| return (T)val; |
| } |
| |
| /** {@inheritDoc} */ |
| @SuppressWarnings("unchecked") |
| @Override public <T> T get(final Object key, final Callable<T> valLdr) { |
| Object val = cache.get(key); |
| |
| if (val == null) { |
| IgniteLock lock = mgr.getSyncLock(cache.getName(), key); |
| |
| lock.lock(); |
| |
| try { |
| val = cache.get(key); |
| |
| if (val == null) { |
| try { |
| T retVal = valLdr.call(); |
| |
| val = wrapNull(retVal); |
| |
| cache.put(key, val); |
| } |
| catch (Exception e) { |
| throw new ValueRetrievalException(key, valLdr, e); |
| } |
| } |
| } |
| finally { |
| lock.unlock(); |
| } |
| } |
| |
| return (T)unwrapNull(val); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void put(Object key, Object val) { |
| if (val == null) |
| cache.withSkipStore().put(key, NULL); |
| else |
| cache.put(key, val); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ValueWrapper putIfAbsent(Object key, Object val) { |
| Object old; |
| |
| if (val == null) |
| old = cache.withSkipStore().getAndPutIfAbsent(key, NULL); |
| else |
| old = cache.getAndPutIfAbsent(key, val); |
| |
| return old != null ? fromValue(old) : null; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void evict(Object key) { |
| cache.remove(key); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void clear() { |
| cache.removeAll(); |
| } |
| |
| /** |
| * @param val Cache value. |
| * @return Wrapped value. |
| */ |
| private static ValueWrapper fromValue(Object val) { |
| assert val != null; |
| |
| return new SimpleValueWrapper(unwrapNull(val)); |
| } |
| |
| private static Object unwrapNull(Object val) { |
| return NULL.equals(val) ? null : val; |
| } |
| |
| private <T> Object wrapNull(T val) { |
| return val == null ? NULL : val; |
| } |
| |
| /** */ |
| private static class NullValue implements Serializable { |
| /** {@inheritDoc} */ |
| @Override public boolean equals(Object o) { |
| return this == o || (o != null && getClass() == o.getClass()); |
| } |
| } |
| } |