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 com.alibaba.compileflow.engine.core.event;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Process event context that encapsulates event-related data.
   * Minimal core keys are provided; additional data can be carried via properties.
   *
   * @author yusu
   */
  public class ProcessEventContext {
  
      public static final String DURATION_MS = "durationMs";
      public static final String ERROR_MESSAGE = "errorMessage";
      public static final String THREAD_NAME = "threadName";
      public static final String TRACE_ID = "traceId";
  
      private final Map<String, Object> properties;
  
      private ProcessEventContext(Map<String, Object> properties) {
          this.properties = Collections.unmodifiableMap(new HashMap<>(properties));
      }
  
      /**
       * Creates an empty event context.
       */
      public static ProcessEventContext empty() {
          return new ProcessEventContext(Collections.emptyMap());
      }
  
      /**
       * Returns a new builder.
       */
      public static Builder builder() {
          return new Builder();
      }
  
      @SuppressWarnings("unchecked")
      public <T> T get(String key) {
          return (T) properties.get(key);
      }
  
      @SuppressWarnings("unchecked")
      public <T> T get(String key, T defaultValue) {
          return properties.containsKey(key) ? (T) properties.get(key) : defaultValue;
      }
  
      public boolean contains(String key) {
          return properties.containsKey(key);
      }
  
      public Map<String, Object> getAllProperties() {
          return properties;
      }
  
      public Long getDurationMs() {
          return get(DURATION_MS);
      }
  
      public String getErrorMessage() {
          return get(ERROR_MESSAGE);
      }
  
      public String getThreadName() {
          return get(THREAD_NAME);
      }
  
      @Override
      public String toString() {
          return "ProcessEventContext{" +
                  "properties=" + properties.size() + " items" +
                  '}';
      }
  
      public static class Builder {
          private final Map<String, Object> properties = new HashMap<>();
  
          private Builder() {
          }
  
          public Builder put(String key, Object value) {
              properties.put(key, value);
              return this;
          }
  
          public Builder durationMs(Long durationMs) {
              if (durationMs != null) {
                  properties.put(DURATION_MS, durationMs);
              }
              return this;
          }
  
          public Builder errorMessage(String errorMessage) {
              if (errorMessage != null) {
                  properties.put(ERROR_MESSAGE, errorMessage);
              }
              return this;
          }
  
          public Builder threadName(String threadName) {
              if (threadName != null) {
                  properties.put(THREAD_NAME, threadName);
              }
              return this;
          }
  
          public Builder traceId(String traceId) {
              if (traceId != null) {
                  properties.put(TRACE_ID, traceId);
              }
              return this;
          }
  
          public ProcessEventContext build() {
              return new ProcessEventContext(properties);
          }
      }
  
  }
  