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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.pdx;


/**
 * WritablePdxInstance is a {@link PdxInstance} that also supports field modification using the
 * {@link #setField setField} method. To get a WritablePdxInstance call
 * {@link PdxInstance#createWriter createWriter}.
 * 
 * @since GemFire 6.6
 */

public interface WritablePdxInstance extends PdxInstance {
  /**
   * Set the existing named field to the given value. The setField method has copy-on-write
   * semantics. So for the modifications to be stored in the cache the WritablePdxInstance must be
   * put into a region after setField has been called one or more times.
   * 
   * @param fieldName name of the field whose value will be set
   * @param value value that will be assigned to the field
   * @throws PdxFieldDoesNotExistException if the named field does not exist
   * @throws PdxFieldTypeMismatchException if the type of the value is not compatible with the field
   */
  public void setField(String fieldName, Object value);
}