| /* |
| * 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.samza.operators.util; |
| |
| import org.apache.samza.checkpoint.CheckpointId; |
| import org.apache.samza.storage.kv.Entry; |
| import org.apache.samza.storage.kv.KeyValueSnapshot; |
| import org.apache.samza.storage.kv.KeyValueIterator; |
| import org.apache.samza.storage.kv.KeyValueStore; |
| |
| import java.nio.file.Path; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| |
| /** |
| * Implements a {@link KeyValueStore} using an in-memory Java Map. |
| * @param <K> the type of key |
| * @param <V> the type of value |
| * |
| * TODO: This class is a stop-gap until we implement persistent store creation from TaskContext. |
| * |
| */ |
| public class InternalInMemoryStore<K, V> implements KeyValueStore<K, V> { |
| |
| private final Map<K, V> map = new LinkedHashMap<>(); |
| |
| @Override |
| public V get(K key) { |
| if (key == null) { |
| throw new NullPointerException("Null key provided"); |
| } |
| return map.get(key); |
| } |
| |
| @Override |
| public Map<K, V> getAll(List<K> keys) { |
| Map<K, V> values = new HashMap<>(); |
| for (K key : keys) { |
| values.put(key, map.get(key)); |
| } |
| return values; |
| } |
| |
| @Override |
| public void put(K key, V value) { |
| if (key == null) { |
| throw new NullPointerException("Null key provided"); |
| } |
| map.put(key, value); |
| } |
| |
| @Override |
| public void putAll(List<Entry<K, V>> entries) { |
| for (Entry<K, V> entry : entries) { |
| put(entry.getKey(), entry.getValue()); |
| } |
| } |
| |
| @Override |
| public void delete(K key) { |
| if (key == null) { |
| throw new NullPointerException("Null key provided"); |
| } |
| map.remove(key); |
| } |
| |
| @Override |
| public void deleteAll(List<K> keys) { |
| for (K key : keys) { |
| delete(key); |
| } |
| } |
| |
| @Override |
| public KeyValueIterator<K, V> range(K from, K to) { |
| throw new RuntimeException("not implemented."); |
| } |
| |
| @Override |
| public KeyValueSnapshot<K, V> snapshot(K from, K to) { |
| throw new UnsupportedOperationException("snapshot() is not supported in " + InternalInMemoryStore.class.getName()); |
| } |
| |
| @Override |
| public KeyValueIterator<K, V> all() { |
| final Iterator<Map.Entry<K, V>> iterator = map.entrySet().iterator(); |
| return new KeyValueIterator<K, V>() { |
| @Override |
| public void close() { |
| //not applicable |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return iterator.hasNext(); |
| } |
| |
| @Override |
| public Entry<K, V> next() { |
| Map.Entry<K, V> kv = iterator.next(); |
| return new Entry<>(kv.getKey(), kv.getValue()); |
| } |
| |
| @Override |
| public void remove() { |
| iterator.remove(); |
| } |
| |
| }; |
| } |
| |
| @Override |
| public void close() { |
| //not applicable |
| } |
| |
| @Override |
| public void flush() { |
| //not applicable |
| } |
| |
| @Override |
| public Optional<Path> checkpoint(CheckpointId id) { |
| return Optional.empty(); |
| } |
| } |