| /* |
| * 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.nifi.distributed.cache.client.adapter; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import org.apache.nifi.distributed.cache.client.Deserializer; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * Implementation of {@link InboundAdapter} where the service response payload is expected to be |
| * a map of keys of type K to values of type V. |
| * |
| * @param <K> the expected type of the service response keys |
| * @param <V> the expected type of the service response values |
| */ |
| public class MapInboundAdapter<K, V> implements InboundAdapter { |
| |
| /** |
| * The deserializer to be used to construct the keys in the service response map. |
| */ |
| private final Deserializer<K> deserializerK; |
| |
| /** |
| * The deserializer to be used to construct the values from the service response object. |
| */ |
| private final Deserializer<V> deserializerV; |
| |
| /** |
| * Container for bytes queued from the service response {@link io.netty.channel.Channel}. |
| */ |
| private final ByteBuf byteBuf; |
| |
| /** |
| * The state of receipt of an individual service response token. |
| */ |
| private final InboundToken<K> inboundTokenK; |
| |
| /** |
| * The state of receipt of an individual service response token. |
| */ |
| private final InboundToken<V> inboundTokenV; |
| |
| /** |
| * The count of map entries expected in the service response. |
| */ |
| private Integer size; |
| |
| /** |
| * The entries received in the service response. |
| */ |
| private final Map<K, V> result; |
| |
| /** |
| * Constructor. |
| * |
| * @param deserializerK the deserializer to be used to construct the service response map keys |
| * @param deserializerV the deserializer to be used to construct the service response map values |
| * @param result container for the map entries received in the service response |
| */ |
| public MapInboundAdapter(final Deserializer<K> deserializerK, |
| final Deserializer<V> deserializerV, final Map<K, V> result) { |
| this.deserializerK = deserializerK; |
| this.deserializerV = deserializerV; |
| this.byteBuf = Unpooled.buffer(); |
| this.inboundTokenK = new InboundToken<>(); |
| this.inboundTokenV = new InboundToken<>(); |
| this.size = null; |
| this.result = result; |
| } |
| |
| /** |
| * @return the service method response value |
| */ |
| public Map<K, V> getResult() { |
| return result; |
| } |
| |
| @Override |
| public boolean isComplete() { |
| return ((size != null) && (this.result.size() >= size)); |
| } |
| |
| @Override |
| public void queue(final byte[] bytes) { |
| byteBuf.writeBytes(bytes); |
| } |
| |
| @Override |
| public void dequeue() throws IOException { |
| if ((size == null) && (byteBuf.readableBytes() >= Integer.BYTES)) { |
| size = byteBuf.readInt(); |
| } |
| while ((size != null) && (result.size() < size)) { |
| if (!inboundTokenK.isComplete()) { |
| inboundTokenK.update(byteBuf, deserializerK); |
| } |
| if (inboundTokenK.isComplete() && !inboundTokenV.isComplete()) { |
| inboundTokenV.update(byteBuf, deserializerV); |
| } |
| if (inboundTokenK.isComplete() && inboundTokenV.isComplete()) { |
| result.put(inboundTokenK.getValue(), inboundTokenV.getValue()); |
| inboundTokenK.reset(); |
| inboundTokenV.reset(); |
| } else { |
| break; |
| } |
| } |
| } |
| } |