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.core.metrics;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Set;
  import org.apache.beam.model.pipeline.v1.MetricsApi.BoundedTrie;
  import org.apache.beam.model.pipeline.v1.MetricsApi.HistogramValue;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.DoubleCoder;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.coders.VarLongCoder;
  import org.apache.beam.sdk.util.ByteStringOutputStream;
  import org.apache.beam.sdk.util.HistogramData;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.ByteString;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.InvalidProtocolBufferException;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Sets;
  import org.joda.time.Instant;
  
  /** A set of functions used to encode and decode common monitoring info types. */
  public class MonitoringInfoEncodings {
    private static final Coder<Long> VARINT_CODER = VarLongCoder.of();
    private static final Coder<Double> DOUBLE_CODER = DoubleCoder.of();
    private static final IterableCoder<String> STRING_SET_CODER =
        IterableCoder.of(StringUtf8Coder.of());
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#DISTRIBUTION_INT64_TYPE}. */
    public static ByteString encodeInt64Distribution(DistributionData data) {
      ByteStringOutputStream output = new ByteStringOutputStream();
      try {
        VARINT_CODER.encode(data.count(), output);
        VARINT_CODER.encode(data.sum(), output);
        VARINT_CODER.encode(data.min(), output);
        VARINT_CODER.encode(data.max(), output);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return output.toByteString();
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#DISTRIBUTION_INT64_TYPE}. */
    public static DistributionData decodeInt64Distribution(ByteString payload) {
      InputStream input = payload.newInput();
      try {
        long count = VARINT_CODER.decode(input);
        long sum = VARINT_CODER.decode(input);
        long min = VARINT_CODER.decode(input);
        long max = VARINT_CODER.decode(input);
        return DistributionData.create(sum, count, min, max);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#DISTRIBUTION_DOUBLE_TYPE}. */
    // TODO(BEAM-4374): Implement decodeDoubleDistribution(...)
    public static ByteString encodeDoubleDistribution(
        long count, double sum, double min, double max) {
      ByteStringOutputStream output = new ByteStringOutputStream();
      try {
        VARINT_CODER.encode(count, output);
        DOUBLE_CODER.encode(sum, output);
        DOUBLE_CODER.encode(min, output);
        DOUBLE_CODER.encode(max, output);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return output.toByteString();
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#LATEST_INT64_TYPE}. */
    public static ByteString encodeInt64Gauge(GaugeData data) {
      ByteStringOutputStream output = new ByteStringOutputStream();
      try {
        VARINT_CODER.encode(data.timestamp().getMillis(), output);
        VARINT_CODER.encode(data.value(), output);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return output.toByteString();
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#LATEST_INT64_TYPE}. */
    public static GaugeData decodeInt64Gauge(ByteString payload) {
      InputStream input = payload.newInput();
      try {
        Instant timestamp = new Instant(VARINT_CODER.decode(input));
        return GaugeData.create(VARINT_CODER.decode(input), timestamp);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#SET_STRING_TYPE}. */
    public static ByteString encodeStringSet(StringSetData data) {
      try (ByteStringOutputStream output = new ByteStringOutputStream()) {
        STRING_SET_CODER.encode(data.stringSet(), output);
        return output.toByteString();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#SET_STRING_TYPE}. */
    public static StringSetData decodeStringSet(ByteString payload) {
      try (InputStream input = payload.newInput()) {
        Set<String> elements = Sets.newHashSet(STRING_SET_CODER.decode(input));
        return StringSetData.create(elements);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#BOUNDED_TRIE_TYPE}. */
    public static ByteString encodeBoundedTrie(BoundedTrieData data) {
      return data.toProto().toByteString();
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#BOUNDED_TRIE_TYPE}. */
    public static BoundedTrieData decodeBoundedTrie(ByteString payload) {
      try {
        return BoundedTrieData.fromProto(BoundedTrie.parseFrom(payload));
      } catch (InvalidProtocolBufferException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#SUM_INT64_TYPE}. */
    public static ByteString encodeInt64Counter(long value) {
      ByteStringOutputStream output = new ByteStringOutputStream();
      try {
        VARINT_CODER.encode(value, output);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return output.toByteString();
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#SUM_INT64_TYPE}. */
    public static long decodeInt64Counter(ByteString payload) {
      try {
        return VarLongCoder.of().decode(payload.newInput());
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#SUM_DOUBLE_TYPE}. */
    public static ByteString encodeDoubleCounter(double value) {
      ByteStringOutputStream output = new ByteStringOutputStream();
      try {
        DOUBLE_CODER.encode(value, output);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      return output.toByteString();
    }
  
    /** Decodes from {@link MonitoringInfoConstants.TypeUrns#SUM_DOUBLE_TYPE}. */
    public static double decodeDoubleCounter(ByteString payload) {
      try {
        return DOUBLE_CODER.decode(payload.newInput());
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  
    /** Encodes to {@link MonitoringInfoConstants.TypeUrns#HISTOGRAM}. */
    public static ByteString encodeInt64Histogram(HistogramData inputHistogram) {
      return inputHistogram.toProto().toByteString();
    }
  
    /** Decodes to {@link MonitoringInfoConstants.TypeUrns#HISTOGRAM}. */
    public static HistogramData decodeInt64Histogram(ByteString payload) {
      try {
        return new HistogramData(HistogramValue.parseFrom(payload));
      } catch (InvalidProtocolBufferException e) {
        throw new RuntimeException(e);
      }
    }
  }
  