MulticastConfig (Hazelcast Root 3.12.6 API)

java.lang.Object
- com.hazelcast.config.MulticastConfig

```
public class MulticastConfig
extends Object
```
Contains the configuration for the multicast discovery mechanism.
With the multicast discovery mechanism Hazelcast allows Hazelcast members to find each other using multicast. So Hazelcast members do not need to know concrete addresses of members, they just multicast to everyone listening.
It depends on your environment if multicast is possible or allowed; you need to have a look at the TCP/IP cluster: TcpIpConfig.

Field Summary

Fields
Modifier and Type	Field and Description
`static boolean`	`DEFAULT_ENABLED` Whether the multicast discovery mechanism has been enabled
`static boolean`	`DEFAULT_LOOPBACK_MODE_ENABLED` Default flag that indicates if the loopback mode is turned on or off.
`static String`	`DEFAULT_MULTICAST_GROUP` Default group of multicast.
`static int`	`DEFAULT_MULTICAST_PORT` Default value of port.
`static int`	`DEFAULT_MULTICAST_TIMEOUT_SECONDS` Default timeout of multicast in seconds.
`static int`	`DEFAULT_MULTICAST_TTL` Default value of time to live of multicast.

Constructor Summary

Constructors
Constructor and Description

MulticastConfig()

Constructors
Constructor and Description
`MulticastConfig()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`MulticastConfig`	`addTrustedInterface(String ip)` Adds a trusted interface.
`boolean`	`equals(Object o)`
`String`	`getMulticastGroup()` Gets the multicast group.
`int`	`getMulticastPort()` Gets the multicast port.
`int`	`getMulticastTimeoutSeconds()` Gets the multicast timeout in seconds.
`int`	`getMulticastTimeToLive()` Gets the time to live for the multicast package.
`Set<String>`	`getTrustedInterfaces()` Gets the trusted interfaces.
`int`	`hashCode()`
`boolean`	`isEnabled()` Check if the multicast discovery mechanism has been enabled.
`boolean`	`isLoopbackModeEnabled()` Check if the loopback mode is enabled in the multicast discovery mechanism.
`MulticastConfig`	`setEnabled(boolean enabled)` Enables or disables the multicast discovery mechanism
`MulticastConfig`	`setLoopbackModeEnabled(boolean enabled)` Enables or disables the loopback mode in the multicast discovery mechanism.
`MulticastConfig`	`setMulticastGroup(String multicastGroup)` Sets the multicast group.
`MulticastConfig`	`setMulticastPort(int multicastPort)` Sets the multicast port.
`MulticastConfig`	`setMulticastTimeoutSeconds(int multicastTimeoutSeconds)` Specifies the time in seconds that a node should wait for a valid multicast response from another node running in the network before declaring itself as master node and creating its own cluster.
`MulticastConfig`	`setMulticastTimeToLive(int multicastTimeToLive)` Sets the time to live for the multicast package; a value between 0..255.
`MulticastConfig`	`setTrustedInterfaces(Set<String> interfaces)` Sets the trusted interfaces.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - DEFAULT_ENABLED
```
public static final boolean DEFAULT_ENABLED
```
    Whether the multicast discovery mechanism has been enabled
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MULTICAST_GROUP
```
public static final String DEFAULT_MULTICAST_GROUP
```
    Default group of multicast.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MULTICAST_PORT
```
public static final int DEFAULT_MULTICAST_PORT
```
    Default value of port.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MULTICAST_TIMEOUT_SECONDS
```
public static final int DEFAULT_MULTICAST_TIMEOUT_SECONDS
```
    Default timeout of multicast in seconds.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MULTICAST_TTL
```
public static final int DEFAULT_MULTICAST_TTL
```
    Default value of time to live of multicast.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_LOOPBACK_MODE_ENABLED
```
public static final boolean DEFAULT_LOOPBACK_MODE_ENABLED
```
    Default flag that indicates if the loopback mode is turned on or off.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - MulticastConfig
```
public MulticastConfig()
```
- Method Detail
  - isEnabled
```
public boolean isEnabled()
```
    Check if the multicast discovery mechanism has been enabled.
    
    Returns:
    
    true if the multicast discovery mechanism has been enabled
  - setEnabled
```
public MulticastConfig setEnabled(boolean enabled)
```
    Enables or disables the multicast discovery mechanism
    
    Parameters:
    
    enabled - true to enable, false to disable
    
    Returns:
    
    the updated MulticastConfig
  - getMulticastGroup
```
public String getMulticastGroup()
```
    Gets the multicast group.
    
    Returns:
    
    the multicastGroup
  - setMulticastGroup
```
public MulticastConfig setMulticastGroup(String multicastGroup)
```
    Sets the multicast group.
    
    Parameters:
    
    multicastGroup - the multicastGroup to set
    
    Returns:
    
    the updated MulticastConfig
    
    Throws:
    
    IllegalArgumentException - if multicastGroup is null or empty
    
    See Also:
    
    getMulticastGroup(), setMulticastPort(int)
  - getMulticastPort
```
public int getMulticastPort()
```
    Gets the multicast port.
    
    Returns:
    
    the multicastPort
    
    See Also:
    
    setMulticastPort(int)
  - setMulticastPort
```
public MulticastConfig setMulticastPort(int multicastPort)
```
    Sets the multicast port.
    
    Parameters:
    
    multicastPort - the multicastPort to set
    
    Returns:
    
    the updated MulticastConfig
    
    Throws:
    
    IllegalArgumentException - if multicastPort is smaller than 0
    
    See Also:
    
    getMulticastPort(), setMulticastGroup(String)
  - getMulticastTimeoutSeconds
```
public int getMulticastTimeoutSeconds()
```
    Gets the multicast timeout in seconds.
    
    Returns:
    
    the multicastTimeoutSeconds
    
    See Also:
    
    setMulticastTimeoutSeconds(int)
  - setMulticastTimeoutSeconds
```
public MulticastConfig setMulticastTimeoutSeconds(int multicastTimeoutSeconds)
```
    Specifies the time in seconds that a node should wait for a valid multicast response from another node running in the network before declaring itself as master node and creating its own cluster. This applies only to the startup of nodes where no master has been assigned yet. If you specify a high value, e.g. 60 seconds, it means until a master is selected, each node is going to wait 60 seconds before continuing, so be careful with providing a high value. If the value is set too low, nodes might give up too early and create their own cluster.
    
    Parameters:
    
    multicastTimeoutSeconds - the multicastTimeoutSeconds to set
    
    Returns:
    
    the updated MulticastConfig
    
    See Also:
    
    getMulticastTimeoutSeconds()
  - getTrustedInterfaces
```
public Set<String> getTrustedInterfaces()
```
    Gets the trusted interfaces.
    
    Returns:
    
    the trusted interfaces
    
    See Also:
    
    setTrustedInterfaces(java.util.Set)
  - setTrustedInterfaces
```
public MulticastConfig setTrustedInterfaces(Set<String> interfaces)
```
    Sets the trusted interfaces.
    By default, when the set of trusted interfaces is empty, a Hazelcast member will accept join-requests from every member. With a trusted interface, you can control the members you want to receive join requests from.
    The interface is an IP address where the last octet can be a wildcard '*' or a range '10-20'.
    
    Parameters:
    
    interfaces - the new trusted interfaces
    
    Returns:
    
    the updated MulticastConfig
    
    See Also:
    
    if interfaces is {@code null}
  - addTrustedInterface
```
public MulticastConfig addTrustedInterface(String ip)
```
    Adds a trusted interface.
    
    Parameters:
    
    ip - the IP of the trusted interface
    
    Returns:
    
    the updated MulticastConfig
    
    Throws:
    
    IllegalArgumentException - if IP is null
    
    See Also:
    
    setTrustedInterfaces(java.util.Set)
  - getMulticastTimeToLive
```
public int getMulticastTimeToLive()
```
    Gets the time to live for the multicast package.
    
    Returns:
    
    the time to live for the multicast package
    
    See Also:
    
    MulticastSocket.setTimeToLive(int), setMulticastTimeToLive(int)
  - setMulticastTimeToLive
```
public MulticastConfig setMulticastTimeToLive(int multicastTimeToLive)
```
    Sets the time to live for the multicast package; a value between 0..255.
    See this link for more information.
    
    Parameters:
    
    multicastTimeToLive - the time to live for the multicast package
    
    Returns:
    
    the updated MulticastConfig
    
    Throws:
    
    IllegalArgumentException - if time to live is smaller than 0 or larger than 255
    
    See Also:
    
    getMulticastTimeToLive(), MulticastSocket.setTimeToLive(int)
  - isLoopbackModeEnabled
```
public boolean isLoopbackModeEnabled()
```
    Check if the loopback mode is enabled in the multicast discovery mechanism.
    
    Returns:
    
    true if the the loopback mode is enabled, false otherwise
  - setLoopbackModeEnabled
```
public MulticastConfig setLoopbackModeEnabled(boolean enabled)
```
    Enables or disables the loopback mode in the multicast discovery mechanism.
    
    Parameters:
    
    enabled - true to enable the loopback mode, false to disable
    
    Returns:
    
    the updated MulticastConfig
  - equals
```
public final boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public final int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class MulticastConfig

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_ENABLED

DEFAULT_MULTICAST_GROUP

DEFAULT_MULTICAST_PORT

DEFAULT_MULTICAST_TIMEOUT_SECONDS

DEFAULT_MULTICAST_TTL

DEFAULT_LOOPBACK_MODE_ENABLED

Constructor Detail

MulticastConfig

Method Detail

isEnabled

setEnabled

getMulticastGroup

setMulticastGroup

getMulticastPort

setMulticastPort

getMulticastTimeoutSeconds

setMulticastTimeoutSeconds

getTrustedInterfaces

setTrustedInterfaces

addTrustedInterface

getMulticastTimeToLive

setMulticastTimeToLive

isLoopbackModeEnabled

setLoopbackModeEnabled

equals

hashCode

toString