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.beam.runners.samza.util;
  
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.samza.metrics.MetricsReporter;
  import org.apache.samza.metrics.ReadableMetricsRegistry;
  import org.checkerframework.checker.nullness.qual.NonNull;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** An in-memory {@link MetricsReporter} for testing. */
  public class InMemoryMetricsReporter implements MetricsReporter {
    private Map<String, ReadableMetricsRegistry> registries;
  
    public InMemoryMetricsReporter() {
      registries = new HashMap<>();
    }
  
    @Override
    public void start() {}
  
    @Override
    public void register(String source, ReadableMetricsRegistry registry) {
      registries.put(source, registry);
    }
  
    @Override
    public void stop() {}
  
    public @Nullable ReadableMetricsRegistry getMetricsRegistry(@NonNull String source) {
      return registries.get(source);
    }
  }
  