| /* |
| * 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.stream; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| import org.apache.ignite.IgniteCache; |
| import org.apache.ignite.IgniteException; |
| import org.apache.ignite.lang.IgniteBiInClosure; |
| |
| /** |
| * Convenience adapter to visit every key-value tuple in the stream. Note, that the visitor |
| * does not update the cache. If the tuple needs to be stored in the cache, |
| * then {@code cache.put(...)} should be called explicitly. |
| */ |
| public abstract class StreamVisitor<K, V> implements StreamReceiver<K, V>, IgniteBiInClosure<IgniteCache<K, V>, Map.Entry<K, V>> { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** {@inheritDoc} */ |
| @Override public void receive(IgniteCache<K, V> cache, Collection<Map.Entry<K, V>> entries) throws IgniteException { |
| for (Map.Entry<K, V> entry : entries) |
| apply(cache, entry); |
| } |
| |
| /** |
| * Creates a new visitor based on instance of {@link IgniteBiInClosure}. |
| * |
| * @param c Closure. |
| * @param <K> Ignite cache key type. |
| * @param <V> Ignite cache value type. |
| * @return Stream visitor. |
| */ |
| public static <K, V> StreamVisitor<K, V> from(final IgniteBiInClosure<IgniteCache<K, V>, Map.Entry<K, V>> c) { |
| return new StreamVisitor<K, V>() { |
| @Override public void apply(IgniteCache<K, V> cache, Map.Entry<K, V> entry) { |
| c.apply(cache, entry); |
| } |
| }; |
| } |
| } |