content: /*
   * 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.bifromq.basekv;
  
  import org.apache.bifromq.basekv.proto.KVRangeId;
  import org.apache.bifromq.basekv.store.api.IKVCloseableReader;
  import org.apache.bifromq.basekv.store.api.IKVRangeCoProc;
  import org.apache.bifromq.basekv.store.api.IKVReader;
  import org.apache.bifromq.basekv.store.api.IKVWriter;
  import org.apache.bifromq.basekv.store.proto.ROCoProcInput;
  import org.apache.bifromq.basekv.store.proto.ROCoProcOutput;
  import org.apache.bifromq.basekv.store.proto.RWCoProcInput;
  import org.apache.bifromq.basekv.store.proto.RWCoProcOutput;
  import com.google.protobuf.ByteString;
  import java.util.Optional;
  import java.util.concurrent.CompletableFuture;
  import java.util.function.Supplier;
  
  public class TestCoProc implements IKVRangeCoProc {
      private final Supplier<IKVCloseableReader> rangeReaderProvider;
  
      public TestCoProc(KVRangeId id, Supplier<IKVCloseableReader> rangeReaderProvider) {
          this.rangeReaderProvider = rangeReaderProvider;
      }
  
      @Override
      public CompletableFuture<ROCoProcOutput> query(ROCoProcInput input, IKVReader reader) {
          // get
          return CompletableFuture.completedFuture(
              ROCoProcOutput.newBuilder().setRaw(reader.get(input.getRaw()).orElse(ByteString.EMPTY)).build());
      }
  
      @Override
      public Supplier<MutationResult> mutate(RWCoProcInput input, IKVReader reader, IKVWriter client) {
          String[] str = input.getRaw().toStringUtf8().split("_");
          ByteString key = ByteString.copyFromUtf8(str[0]);
          ByteString value = ByteString.copyFromUtf8(str[1]);
          // update
          Optional<ByteString> existing = reader.get(key);
          client.put(key, value);
          return () -> new MutationResult(RWCoProcOutput.newBuilder().setRaw(existing.orElse(ByteString.EMPTY)).build(),
              Optional.empty());
      }
  
      @Override
      public void close() {
  
      }
  }
  