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DIRECTMEMORY-124 - forgot to svn add Jaromir's classes

git-svn-id: https://svn.apache.org/repos/asf/directmemory/trunk@1443592 13f79535-47bb-0310-9956-ffa450edef68
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1 parent 37316a6 commit 214476bc762f93b8ede1cedf46d4d0099862fac9 @tteofili tteofili committed Feb 7, 2013
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90 ...emory-cache/src/main/java/org/apache/directmemory/utils/NonStrictCacheValuesIterator.java
@@ -0,0 +1,90 @@
+package org.apache.directmemory.utils;
+
+/*
+ * 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.
+ */
+
+import java.util.Iterator;
+
+import org.apache.directmemory.cache.CacheService;
+
+/**
+ * The relaxed iterator, it guarantees that if hasNext() returns true, the subsequent calling next() always returns a value.
+ * This value might be stalled or expired.
+ *
+ * @param <K>
+ * @param <V>
+ */
+public class NonStrictCacheValuesIterator<K, V>
+ implements Iterator<V>
+{
+ private Iterator<K> keysIterator;
+
+ private CacheService<K, V> cacheService;
+
+ private K currentKey;
+
+ private K nextKey;
+
+ private V nextValue;
+
+ public NonStrictCacheValuesIterator( Iterator<K> keysIterator, CacheService<K, V> cacheService )
+ {
+ this.keysIterator = keysIterator;
+ this.cacheService = cacheService;
+ findNext();
+ }
+
+ @Override
+ public boolean hasNext()
+ {
+ return nextValue != null;
+ }
+
+ @Override
+ public V next()
+ {
+ V currentValue = nextValue;
+ currentKey = nextKey;
+ findNext();
+ return currentValue;
+ }
+
+ @Override
+ public void remove()
+ {
+ cacheService.free( currentKey );
+ }
+
+ private void findNext()
+ {
+ while ( keysIterator.hasNext() )
+ {
+ K key = keysIterator.next();
+ V value = cacheService.retrieve( key );
+ if ( value != null )
+ {
+ nextKey = key;
+ nextValue = value;
+ return;
+ }
+ }
+ nextKey = null;
+ nextValue = null;
+ }
+}
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66 ...ctmemory-cache/src/main/java/org/apache/directmemory/utils/StrictCacheValuesIterator.java
@@ -0,0 +1,66 @@
+package org.apache.directmemory.utils;
+
+/*
+ * 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.
+ */
+
+import java.util.Iterator;
+
+import org.apache.directmemory.cache.CacheService;
+import org.apache.directmemory.memory.Pointer;
+
+public class StrictCacheValuesIterator<K, V>
+ implements Iterator<V>
+{
+ private Iterator<K> keysIterator;
+
+ private CacheService<K, V> cacheService;
+
+ private K currentKey;
+
+ public StrictCacheValuesIterator( Iterator<K> keysIterator, CacheService<K, V> cacheService )
+ {
+ this.keysIterator = keysIterator;
+ this.cacheService = cacheService;
+ }
+
+ @Override
+ public boolean hasNext()
+ {
+ return keysIterator.hasNext();
+ }
+
+ @Override
+ public V next()
+ {
+ currentKey = keysIterator.next();
+ Pointer<V> pointer = cacheService.getPointer( currentKey );
+ if ( pointer != null && pointer.isExpired() )
+ {
+ throw new RuntimeException( "Value pointer has expired" );
+ }
+ return cacheService.retrieve( currentKey );
+ }
+
+ @Override
+ public void remove()
+ {
+ cacheService.free( currentKey );
+ keysIterator.remove();
+ }
+};

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