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com.tangosol.net
Class ConfigurableAddressProvider

java.lang.Object
java.util.AbstractCollection
java.util.AbstractSet
com.tangosol.net.ConfigurableAddressProvider

All Implemented Interfaces:

AddressProvider, DescribableAddressProvider, SocketAddressProvider, java.lang.Iterable, java.util.Collection, java.util.Set

Direct Known Subclasses:

ConfigurableLocalAddressProvider

public class ConfigurableAddressProvider

extends java.util.AbstractSet

implements DescribableAddressProvider

ConfigurableAddressProvider is an implementation of the AddressProvider interface based on a static list of addresses configured in an XML element that contains one or more items in the following format:

 <socket-address>
   <address>...</address>
   <port>...</port>
 </socket-address>
 

The order of items in the configured list will be randomized to provide basic load balancing.

This implementation is not thread safe.

Since:

Coherence 3.4

Author:

gg 2008-08-18

Nested Class Summary

protected class

ConfigurableAddressProvider.AddressHolder A stateful holder for an obtaining an InetSocketAddress object.

Field Summary

boolean	m_fResolve Specifies if the list of address need DNS resolution.
protected boolean	m_fSafe Specifies if the provider is only to return resolved addresses.
protected int	m_iLast Index of the last returned address.
protected java.util.List	m_listHolders A list of AddressHolder objects.

Constructor Summary

ConfigurableAddressProvider(XmlElement xmlConfig)
Construct an instance of ConfigurableAddressProvider based on the specified XML element.

ConfigurableAddressProvider(XmlElement xmlConfig, boolean fSafe)
Construct an instance of ConfigurableAddressProvider based on the specified XML element.

Method Summary

void	accept() This method should be called by the client immediately after it determines that it can successfully use an address returned by the SocketAddressProvider.getNextAddress() method.
protected void	configure(XmlElement xmlConfig) Configure this ConfigurableAddressProvider based on the specified XML.
boolean	equals(java.lang.Object o) AddressProvider instances should compare to be equals() iff they should be expected to consistently produce the same resulting set of addresses.
java.lang.String[]	getAddressDescriptions() Retrieve a human readable description of underlying addresses.
java.net.InetSocketAddress	getNextAddress() Covariant of SocketAddressProvider.getNextAddress() which returns an InetSocketAddress.
int	hashCode() Return the hash code for this AddressProvider.
java.util.Iterator	iterator() Returns an iterator over the elements contained in this collection.
static AddressProvider	makeProvider(XmlElement xmlConfig) Creates an instances of ConfigurableAddressProvider or RefreshableAddressProvider that refresh the address list of the ConfigurableAddressProvider asynchronously.
void	reject(java.lang.Throwable eCause) This method should be called by the client immediately after it determines that an attempt to use an address returned by the SocketAddressProvider.getNextAddress() method has failed.
protected void	reset() Make all addresses iterable, starting at the first address.
protected void	reset(int iLast) Make all addresses iterable, starting at the index after the specified one.
protected java.net.InetSocketAddress	resolveAddress(java.lang.String sHost, int nPort) Resolve an address and port.
int	size() Returns the number of elements in this collection.
protected java.util.List	sortHolders(java.util.List list) Sort the holders in the order to be returned by the getNextAddress() method.
java.lang.String	toString() Return a string representation of this ConfigurableAddressProvider.

Methods inherited from class java.util.AbstractSet

removeAll

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, toArray, toArray

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, toArray, toArray

Field Detail

m_listHolders

protected java.util.List m_listHolders

A list of AddressHolder objects.

m_iLast

protected int m_iLast

Index of the last returned address.

m_fSafe

protected boolean m_fSafe

Specifies if the provider is only to return resolved addresses.

m_fResolve

public boolean m_fResolve

Specifies if the list of address need DNS resolution.

Constructor Detail

ConfigurableAddressProvider

public ConfigurableAddressProvider(XmlElement xmlConfig)

Construct an instance of ConfigurableAddressProvider based on the specified XML element.

Unresolveable addresses will be skipped.

Parameters:

xmlConfig - the XML element that contains the configuration info

ConfigurableAddressProvider

public ConfigurableAddressProvider(XmlElement xmlConfig,
                                   boolean fSafe)

Construct an instance of ConfigurableAddressProvider based on the specified XML element.

Parameters:

xmlConfig - the XML element that contains the configuration info

fSafe - true if the provider is skips unresolved addresses

Method Detail

makeProvider

public static AddressProvider makeProvider(XmlElement xmlConfig)

Creates an instances of ConfigurableAddressProvider or RefreshableAddressProvider that refresh the address list of the ConfigurableAddressProvider asynchronously.

Parameters:

xmlConfig - the XML element that contains the configuration info

Returns:

an instance of the corresponding AddressProvider implementation

getNextAddress

public java.net.InetSocketAddress getNextAddress()

Covariant of SocketAddressProvider.getNextAddress() which returns an InetSocketAddress.

Specified by:

getNextAddress in interface AddressProvider

Specified by:

getNextAddress in interface SocketAddressProvider

Returns:

the next available address or null if the list of available addresses was exhausted

accept

public void accept()

This method should be called by the client immediately after it determines that it can successfully use an address returned by the SocketAddressProvider.getNextAddress() method.

Specified by:

accept in interface SocketAddressProvider

reject

public void reject(java.lang.Throwable eCause)

This method should be called by the client immediately after it determines that an attempt to use an address returned by the SocketAddressProvider.getNextAddress() method has failed.

Specified by:

reject in interface SocketAddressProvider

Parameters:

eCause - (optional) an exception that carries the reason why the the caller rejected the previously returned address

size

public int size()

Returns the number of elements in this collection. If the collection contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

size in interface java.util.Collection

Specified by:

size in interface java.util.Set

Specified by:

size in class java.util.AbstractCollection

Returns:

the number of elements in this collection

iterator

public java.util.Iterator iterator()

Returns an iterator over the elements contained in this collection.

Specified by:

iterator in interface java.lang.Iterable

Specified by:

iterator in interface java.util.Collection

Specified by:

iterator in interface java.util.Set

Specified by:

iterator in class java.util.AbstractCollection

Returns:

an iterator over the elements contained in this collection

reset

protected void reset()

Make all addresses iterable, starting at the first address.

reset

protected void reset(int iLast)

Make all addresses iterable, starting at the index after the specified one.

Parameters:

iLast - the index of the last address returned

configure

protected void configure(XmlElement xmlConfig)

Configure this ConfigurableAddressProvider based on the specified XML.

Parameters:

xmlConfig - the XML element that contains the configuration info

sortHolders

protected java.util.List sortHolders(java.util.List list)

Sort the holders in the order to be returned by the getNextAddress() method. This implementation randomizes the holder list for simple load balancing.

Parameters:

list - the original list retrieved from the configuration

Returns:

the re-ordered list

equals

public boolean equals(java.lang.Object o)

AddressProvider instances should compare to be equals() iff they should be expected to consistently produce the same resulting set of addresses.

Note: the general contract of hashCode and equals() should be preserved; AddressProviders which compare equals() should have the same hashCode.

Specified by:

equals in interface SocketAddressProvider

Specified by:

equals in interface java.util.Collection

Specified by:

equals in interface java.util.Set

Overrides:

equals in class java.util.AbstractSet

Parameters:

o - the Object to compare this AddressProvider to for equality

Returns:

true iff this AddressProvider is equal to the specified object

hashCode

public int hashCode()

Return the hash code for this AddressProvider.

Specified by:

hashCode in interface SocketAddressProvider

Specified by:

hashCode in interface java.util.Collection

Specified by:

hashCode in interface java.util.Set

Overrides:

hashCode in class java.util.AbstractSet

Returns:

the hash code for this AddressProvider

toString

public java.lang.String toString()

Return a string representation of this ConfigurableAddressProvider.

Overrides:

toString in class java.util.AbstractCollection

Returns:

a string representation of the list of configured addresses

getAddressDescriptions

public java.lang.String[] getAddressDescriptions()

Retrieve a human readable description of underlying addresses.

Specified by:

getAddressDescriptions in interface DescribableAddressProvider

Returns:

a string array of addresses in human readable format

resolveAddress

protected java.net.InetSocketAddress resolveAddress(java.lang.String sHost,
                                                    int nPort)

Resolve an address and port.

Parameters:

sHost - the host

nPort - the port

Returns:

the InetSocketAddress

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