| /* |
| * 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.flink.util; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.core.memory.DataInputDeserializer; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputSerializer; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.util.function.BiConsumerWithException; |
| import org.apache.flink.util.function.BiFunctionWithException; |
| |
| import javax.annotation.Nullable; |
| |
| import java.io.IOException; |
| |
| import static org.apache.flink.util.Preconditions.checkState; |
| |
| /** LinkedOptionalMapSerializer - A serializer of {@link LinkedOptionalMap}. */ |
| @Internal |
| public final class LinkedOptionalMapSerializer { |
| |
| /** This header is used for sanity checks on input streams. */ |
| private static final long HEADER = 0x4f2c69a3d70L; |
| |
| private LinkedOptionalMapSerializer() {} |
| |
| public static <K, V> void writeOptionalMap( |
| DataOutputView out, |
| LinkedOptionalMap<K, V> map, |
| BiConsumerWithException<DataOutputView, K, IOException> keyWriter, |
| BiConsumerWithException<DataOutputView, V, IOException> valueWriter) |
| throws IOException { |
| |
| out.writeLong(HEADER); |
| out.writeInt(map.size()); |
| map.forEach( |
| ((keyName, key, value) -> { |
| out.writeUTF(keyName); |
| |
| if (key == null) { |
| out.writeBoolean(false); |
| } else { |
| out.writeBoolean(true); |
| writeFramed(out, keyWriter, key); |
| } |
| |
| if (value == null) { |
| out.writeBoolean(false); |
| } else { |
| out.writeBoolean(true); |
| writeFramed(out, valueWriter, value); |
| } |
| })); |
| } |
| |
| public static <K, V> LinkedOptionalMap<K, V> readOptionalMap( |
| DataInputView in, |
| BiFunctionWithException<DataInputView, String, K, IOException> keyReader, |
| BiFunctionWithException<DataInputView, String, V, IOException> valueReader) |
| throws IOException { |
| |
| final long header = in.readLong(); |
| checkState(header == HEADER, "Corrupted stream received header %s", header); |
| |
| long mapSize = in.readInt(); |
| LinkedOptionalMap<K, V> map = new LinkedOptionalMap<>(); |
| for (int i = 0; i < mapSize; i++) { |
| String keyName = in.readUTF(); |
| |
| final K key; |
| if (in.readBoolean()) { |
| key = tryReadFrame(in, keyName, keyReader); |
| } else { |
| key = null; |
| } |
| |
| final V value; |
| if (in.readBoolean()) { |
| value = tryReadFrame(in, keyName, valueReader); |
| } else { |
| value = null; |
| } |
| |
| map.put(keyName, key, value); |
| } |
| return map; |
| } |
| |
| private static <T> void writeFramed( |
| DataOutputView out, |
| BiConsumerWithException<DataOutputView, T, IOException> writer, |
| T item) |
| throws IOException { |
| DataOutputSerializer frame = new DataOutputSerializer(64); |
| writer.accept(frame, item); |
| |
| final byte[] buffer = frame.getSharedBuffer(); |
| final int bufferSize = frame.length(); |
| out.writeInt(bufferSize); |
| out.write(buffer, 0, bufferSize); |
| } |
| |
| @Nullable |
| private static <T> T tryReadFrame( |
| DataInputView in, |
| String keyName, |
| BiFunctionWithException<DataInputView, String, T, IOException> reader) |
| throws IOException { |
| final int bufferSize = in.readInt(); |
| final byte[] buffer = new byte[bufferSize]; |
| in.readFully(buffer); |
| DataInputDeserializer frame = new DataInputDeserializer(buffer); |
| return reader.apply(frame, keyName); |
| } |
| } |