io.etcd.jetcd.watch.WatchResponse Maven / Gradle / Ivy

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/*
 * Copyright 2016-2019 The jetcd authors
 *
 * Licensed 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 io.etcd.jetcd.watch;

import com.google.common.annotations.VisibleForTesting;
import io.etcd.jetcd.AbstractResponse;
import io.etcd.jetcd.ByteSequence;
import io.etcd.jetcd.KeyValue;
import io.etcd.jetcd.api.Event;
import java.util.List;
import java.util.stream.Collectors;

public class WatchResponse extends AbstractResponse {

  private List events;
  private final ByteSequence namespace;

  public WatchResponse(io.etcd.jetcd.api.WatchResponse response, ByteSequence namespace) {
    super(response, response.getHeader());
    this.namespace = namespace;
  }

  @VisibleForTesting
  public WatchResponse(io.etcd.jetcd.api.WatchResponse response) {
    this(response, ByteSequence.EMPTY);
  }

  /**
   * convert API watch event to client event.
   */
  private static WatchEvent toEvent(Event event, ByteSequence namespace) {
    WatchEvent.EventType eventType;
    switch (event.getType()) {
      case DELETE:
        eventType = WatchEvent.EventType.DELETE;
        break;
      case PUT:
        eventType = WatchEvent.EventType.PUT;
        break;
      default:
        eventType = WatchEvent.EventType.UNRECOGNIZED;
    }

    return new WatchEvent(
        new KeyValue(event.getKv(), namespace),
        new KeyValue(event.getPrevKv(), namespace),
        eventType);
  }

  public synchronized List getEvents() {
    if (events == null) {
      events = getResponse().getEventsList().stream()
          .map(event -> WatchResponse.toEvent(event, namespace))
          .collect(Collectors.toList());
    }

    return events;
  }
}