src/main/java/org/apache/fineract/cn/lang/TenantContextHolder.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.fineract.cn.lang;

import org.springframework.util.Assert;

import javax.annotation.Nonnull;
import java.util.Optional;

public final class TenantContextHolder {

  private static final InheritableThreadLocal<String> THREAD_LOCAL = new InheritableThreadLocal<>();

  private TenantContextHolder() {
    super();
  }

  @Nonnull
  public static Optional<String> identifier() {
    return Optional.ofNullable(TenantContextHolder.THREAD_LOCAL.get());
  }

  @SuppressWarnings("WeakerAccess")
  public static String checkedGetIdentifier() {
    return identifier().orElseThrow(() -> new IllegalStateException("Tenant context not set."));
  }

  public static void setIdentifier(@Nonnull final String identifier) {
    Assert.notNull(identifier, "A tenant identifier must be given.");
    Assert.hasLength(identifier, "A tenant identifier must have at least one character.");
    Assert.isNull(TenantContextHolder.THREAD_LOCAL.get(), "Tenant identifier already set.");
    TenantContextHolder.THREAD_LOCAL.set(identifier);
  }

  public static void clear() {
    TenantContextHolder.THREAD_LOCAL.remove();
  }
}