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/*
 * -\-\-
 * Spotify Styx Common
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * 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 com.spotify.styx.storage;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedSet;

import com.spotify.styx.model.SequenceEvent;
import com.spotify.styx.model.WorkflowInstance;

import java.io.IOException;
import java.util.Map;
import java.util.Optional;
import java.util.SortedSet;

public class NoopEventStorage implements EventStorage {

  @Override
  public SortedSet readEvents(WorkflowInstance workflowInstance) throws IOException {
    return ImmutableSortedSet.of();
  }

  @Override
  public void writeEvent(SequenceEvent sequenceEvent) throws IOException {
  }

  @Override
  public Optional getLatestStoredCounter(WorkflowInstance workflowInstance)
      throws IOException {
    return Optional.empty();
  }

  @Override
  public void writeActiveState(WorkflowInstance workflowInstance, long counter) throws IOException {
  }

  @Override
  public void deleteActiveState(WorkflowInstance workflowInstance) throws IOException {
  }

  @Override
  public Map readActiveWorkflowInstances() throws IOException {
    return ImmutableMap.of();
  }
}