| /* |
| * 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.runtime.accumulators; |
| |
| import org.apache.flink.api.common.accumulators.Accumulator; |
| import org.apache.flink.util.ExceptionUtils; |
| import org.apache.flink.util.OptionalFailure; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.annotation.Nullable; |
| |
| import java.util.Map; |
| |
| /** Container class that transports the result of an accumulator as set of strings. */ |
| public class StringifiedAccumulatorResult implements java.io.Serializable { |
| private static final Logger LOG = LoggerFactory.getLogger(StringifiedAccumulatorResult.class); |
| |
| private static final long serialVersionUID = -4642311296836822611L; |
| |
| private final String name; |
| private final String type; |
| private final String value; |
| |
| public StringifiedAccumulatorResult(String name, String type, String value) { |
| this.name = name; |
| this.type = type; |
| this.value = value; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public String getType() { |
| return type; |
| } |
| |
| public String getValue() { |
| return value; |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Utilities |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Flatten a map of accumulator names to Accumulator instances into an array of |
| * StringifiedAccumulatorResult values. |
| */ |
| public static StringifiedAccumulatorResult[] stringifyAccumulatorResults( |
| Map<String, OptionalFailure<Accumulator<?, ?>>> accs) { |
| if (accs == null || accs.isEmpty()) { |
| return new StringifiedAccumulatorResult[0]; |
| } else { |
| StringifiedAccumulatorResult[] results = new StringifiedAccumulatorResult[accs.size()]; |
| |
| int i = 0; |
| for (Map.Entry<String, OptionalFailure<Accumulator<?, ?>>> entry : accs.entrySet()) { |
| results[i++] = stringifyAccumulatorResult(entry.getKey(), entry.getValue()); |
| } |
| return results; |
| } |
| } |
| |
| private static StringifiedAccumulatorResult stringifyAccumulatorResult( |
| String name, @Nullable OptionalFailure<Accumulator<?, ?>> accumulator) { |
| if (accumulator == null) { |
| return new StringifiedAccumulatorResult(name, "null", "null"); |
| } else if (accumulator.isFailure()) { |
| return new StringifiedAccumulatorResult( |
| name, "null", ExceptionUtils.stringifyException(accumulator.getFailureCause())); |
| } else { |
| Object localValue; |
| String simpleName = "null"; |
| try { |
| simpleName = accumulator.getUnchecked().getClass().getSimpleName(); |
| localValue = accumulator.getUnchecked().getLocalValue(); |
| } catch (RuntimeException exception) { |
| LOG.error("Failed to stringify accumulator [" + name + "]", exception); |
| localValue = ExceptionUtils.stringifyException(exception); |
| } |
| return new StringifiedAccumulatorResult( |
| name, simpleName, localValue != null ? localValue.toString() : "null"); |
| } |
| } |
| } |