/*
 * Copyright (c) 2014, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package org.postgresql.hostchooser;

Describes the required server type.
/**
 * Describes the required server type.
 */
public enum HostRequirement {
  any {
    public boolean allowConnectingTo(HostStatus status) {
      return status != HostStatus.ConnectFail;
    }
  },
  master {
    public boolean allowConnectingTo(HostStatus status) {
      return status == HostStatus.Master || status == HostStatus.ConnectOK;
    }
  },
  secondary {
    public boolean allowConnectingTo(HostStatus status) {
      return status == HostStatus.Secondary || status == HostStatus.ConnectOK;
    }
  },
  preferSecondary {
    public boolean allowConnectingTo(HostStatus status) {
      return status != HostStatus.ConnectFail;
    }
  };

  public abstract boolean allowConnectingTo(HostStatus status);

  
The postgreSQL project has decided not to use the term slave to refer to alternate servers.
secondary or standby is preferred. We have arbitrarily chosen secondary.
As of Jan 2018 in order not to break existint code we are going to accept both slave or
secondary for names of alternate servers.
The current policy is to keep accepting this silently but not document slave, or slave preferSlave
Params:
targetServerType – the value of targetServerType connection property
Returns:
HostRequirement/**
   * <p>The postgreSQL project has decided not to use the term slave to refer to alternate servers.
   * secondary or standby is preferred. We have arbitrarily chosen secondary.
   * As of Jan 2018 in order not to break existint code we are going to accept both slave or
   * secondary for names of alternate servers.</p>
   *
   * <p>The current policy is to keep accepting this silently but not document slave, or slave preferSlave</p>
   *
   * @param targetServerType the value of {@code targetServerType} connection property
   * @return HostRequirement
   */

  public static HostRequirement getTargetServerType(String targetServerType) {
    String allowSlave = targetServerType.replace("lave", "econdary");
    return valueOf(allowSlave);
  }

}