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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.admin;

/**
 * Provides configuration information relating to the health of a member of a GemFire distributed
 * system.
 *
 * 
 *
 * If any of the following criteria is true, then a member is considered to be in
 * {@link GemFireHealth#OKAY_HEALTH OKAY_HEALTH}.
 *
 * 

 *
 * The size of the {@linkplain #getMaxVMProcessSize VM process} is too large.
 *
 * There are too many {@linkplain #getMaxMessageQueueSize enqueued} incoming/outgoing
 * messages.
 *
 * Too many message sends {@link #getMaxReplyTimeouts timeout} while waiting for a reply.
 *
 * 
 *
 * If any of the following criteria is true, then a member is considered to be in
 * {@link GemFireHealth#POOR_HEALTH POOR_HEALTH}.
 *
 * 
 *
 * 
 *
 *
 * @since GemFire 3.5
 * @deprecated as of 7.0 use the management
 *             package instead
 */
public interface MemberHealthConfig {

  /**
   * The default maximum VM process size (in megabytes) of a health member of the distributed
   * system. The default value is 1000.
   */
  public static final long DEFAULT_MAX_VM_PROCESS_SIZE = 1000;

  /**
   * The default maximum number of enqueued incoming or outgoing messages that a healthy member of a
   * distributed system can have. The default value is 1000.
   */
  public static final long DEFAULT_MAX_MESSAGE_QUEUE_SIZE = 1000;

  /**
   * The default maximum number of message reply timeouts that can occur in a given health
   * monitoring interval. The default value is zero.
   */
  public static final long DEFAULT_MAX_REPLY_TIMEOUTS = 0;

  /**
   * The default maximum multicast retransmission ratio. The default value is 0.20 (twenty percent
   * of messages retransmitted)
   */
  public static final double DEFAULT_MAX_RETRANSMISSION_RATIO = 0.20;

  /////////////////////// Instance Methods ///////////////////////

  /**
   * Returns the maximum VM process size (in megabytes) of a healthy member of the distributed
   * system.
   *
   * @see #DEFAULT_MAX_VM_PROCESS_SIZE
   */
  public long getMaxVMProcessSize();

  /**
   * Sets the maximum VM process size (in megabytes) of a healthy member of the distributed system.
   *
   * @see #getMaxVMProcessSize
   */
  public void setMaxVMProcessSize(long size);

  /**
   * Returns the maximum number of enqueued incoming or outgoing messages that a healthy member of a
   * distributed system can have.
   *
   * @see #DEFAULT_MAX_MESSAGE_QUEUE_SIZE
   */
  public long getMaxMessageQueueSize();

  /**
   * Sets the maximum number of enqueued incoming or outgoing messages that a healthy member of a
   * distributed system can have.
   *
   * @see #getMaxMessageQueueSize
   */
  public void setMaxMessageQueueSize(long maxMessageQueueSize);

  /**
   * Returns the maximum number message replies that can timeout in a healthy member.
   *
   * @see #DEFAULT_MAX_REPLY_TIMEOUTS
   */
  public long getMaxReplyTimeouts();

  /**
   * Sets the maximum number message replies that can timeout in a healthy member.
   *
   * @see #getMaxReplyTimeouts
   */
  public void setMaxReplyTimeouts(long maxReplyTimeouts);

  /**
   * Returns the maximum ratio of multicast retransmissions / total multicast messages.
   * Retransmissions are requestor-specific (i.e., unicast), so a single lost message may result in
   * multiple retransmissions.
   * 
   * A high retransmission ratio may indicate poor network conditions requiring reduced flow-control
   * settings, a udp-fragment-size setting that is too high.
   * 
   * @see #DEFAULT_MAX_RETRANSMISSION_RATIO
   */
  public double getMaxRetransmissionRatio();

  /**
   * Sets the maximum ratio of multicast retransmissions / total multicast messages.
   * 
   * @see #getMaxRetransmissionRatio
   */
  public void setMaxRetransmissionRatio(double ratio);

}