geode-gfsh/src/main/java/org/apache/geode/management/internal/cli/remote/WrapperThreadLocal.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.management.internal.cli.remote;

/**
 *
 *
 * @param <T> Type of ThreadLocal variable
 *
 * @since GemFire 7.0
 */
public abstract class WrapperThreadLocal<T> extends ThreadLocal<T> {

  public T getAndCreateIfAbsent() {
    if (!isSet()) {
      set(createWrapped());
    }
    return get();
  }

  protected abstract T createWrapped();

  public boolean isSet() {
    return get() != null;
  }
}