geode-core/src/main/java/org/apache/geode/internal/logging/SessionContext.java

/*
 * 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.geode.internal.logging;

public interface SessionContext {

  State getState();

  LogConfigSupplier getLogConfigSupplier();

  enum State {
    CREATED,
    STARTED,
    STOPPED;

    State changeTo(final State newState) {
      switch (newState) {
        case CREATED:
          if (this != STOPPED) {
            throw new IllegalStateException("Session must not exist before creating");
          }
          return CREATED;
        case STARTED:
          if (this != CREATED) {
            throw new IllegalStateException("Session must be created before starting");
          }
          return STARTED;
        case STOPPED:
          if (this != STARTED) {
            throw new IllegalStateException("Session must be started before stopping");
          }
      }
      return STOPPED;
    }
  }
}