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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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.distributed.internal;

import java.util.HashSet;

import org.apache.geode.internal.i18n.LocalizedStrings;

/**
 * Provides an implementation of the {@link DistributionConfig} interface for a snapshot of running
 * application's configuration. The snapshot can be taken, given to others, modified, and then
 * applied to a currently running application.
 * 
 * Settors will fail if called on attributes that can not be modified when a system is running.
 * 

 * Instances should be obtained by calling {@link RuntimeDistributionConfigImpl#takeSnapshot}.
 * 
 * Removed implementations of hashCode() and equals() that were throwing
 * UnsupportedOperationException. See bug #50939 if you need to override those.
 */
public final class DistributionConfigSnapshot extends DistributionConfigImpl {
  private static final long serialVersionUID = 7445728132965092798L;

  private HashSet modifiable;

  /**
   * Constructs an internal system config given an existing one.
   * 
   * @param dc an existing system configuration.
   */
  public DistributionConfigSnapshot(DistributionConfig dc) {
    super(dc);
    this.modifiable = new HashSet(20);
    String[] attNames = dc.getAttributeNames();
    for (int i = 0; i < attNames.length; i++) {
      if (dc.isAttributeModifiable(attNames[i])) {
        this.modifiable.add(attNames[i]);
      }
    }
  }

  @Override
  protected String _getUnmodifiableMsg(String attName) {
    return LocalizedStrings.DistributionConfigSnapshot_THE_0_CONFIGURATION_ATTRIBUTE_CAN_NOT_BE_MODIFIED_WHILE_THE_SYSTEM_IS_RUNNING
        .toLocalizedString(attName);
  }

  @Override
  public boolean isAttributeModifiable(String attName) {
    checkAttributeName(attName);
    return modifiable.contains(attName);
  }

  @Override
  protected boolean _modifiableDefault() {
    return true;
  }
}