org.apache.jmeter.protocol.http.control
Class DNSCacheManager

java.lang.Object
  org.apache.jmeter.testelement.AbstractTestElement
      org.apache.jmeter.config.ConfigTestElement
          org.apache.jmeter.protocol.http.control.DNSCacheManager

All Implemented Interfaces:

Serializable, Cloneable, org.apache.http.conn.DnsResolver, ConfigElement, Searchable, TestElement, TestIterationListener

public class DNSCacheManager
extends ConfigTestElement
implements TestIterationListener, Serializable, org.apache.http.conn.DnsResolver

This config element provides ability to have flexible control over DNS caching function. Depending on option from @see DNSCachePanel, either system or custom resolver can be used. Custom resolver uses dnsjava library, and gives ability to bypass both OS and JVM cache. It allows to use paradigm "1 virtual user - 1 DNS cache" in performance tests.

Since:

2.12

See Also:

Serialized Form

Field Summary

static String	CLEAR_CACHE_EACH_ITER
static boolean	DEFAULT_CLEAR_CACHE_EACH_ITER
static boolean	DEFAULT_IS_CUSTOM_RESOLVER
static String	DEFAULT_SERVERS
static String	IS_CUSTOM_RESOLVER
static String	SERVERS

Fields inherited from class org.apache.jmeter.config.ConfigTestElement

PASSWORD, USERNAME

Fields inherited from interface org.apache.jmeter.testelement.TestElement

COMMENTS, ENABLED, GUI_CLASS, NAME, TEST_CLASS

Constructor Summary

DNSCacheManager()

Method Summary

void	addServer(String dnsServer)
void	clear() Clear the TestElement of all data.
Object	clone()
CollectionProperty	getServers()
boolean	isClearEachIteration() Clean DNS cache each iteration
boolean	isCustomResolver()
InetAddress[]	resolve(String host) Resolves address using system or custom DNS resolver
void	setClearEachIteration(boolean clear) Clean DNS cache each iteration
void	setCustomResolver(boolean isCustomResolver)
void	testIterationStart(LoopIterationEvent event) Each time through a Thread Group's test script, an iteration event is fired for each thread.

Methods inherited from class org.apache.jmeter.config.ConfigTestElement

addConfigElement, addTestElement, expectsModification

Methods inherited from class org.apache.jmeter.testelement.AbstractTestElement

addPropertiesValues, addProperty, addProperty, canRemove, clearTemporary, clearTestElementChildren, emptyTemporary, equals, getComment, getName, getProperty, getPropertyAsBoolean, getPropertyAsBoolean, getPropertyAsDouble, getPropertyAsFloat, getPropertyAsInt, getPropertyAsInt, getPropertyAsLong, getPropertyAsLong, getPropertyAsString, getPropertyAsString, getSearchableTokens, getThreadContext, getThreadName, hashCode, isEnabled, isRunningVersion, isTemporary, logProperties, mergeIn, propertyIterator, recoverRunningVersion, removeProperty, setComment, setEnabled, setName, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setRunningVersion, setTemporary, setThreadContext, setThreadName, traverse, traverseCollection, traverseMap, traverseProperty

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

CLEAR_CACHE_EACH_ITER

public static final String CLEAR_CACHE_EACH_ITER

See Also:

Constant Field Values

SERVERS

public static final String SERVERS

See Also:

Constant Field Values

IS_CUSTOM_RESOLVER

public static final String IS_CUSTOM_RESOLVER

See Also:

Constant Field Values

DEFAULT_CLEAR_CACHE_EACH_ITER

public static final boolean DEFAULT_CLEAR_CACHE_EACH_ITER

See Also:

Constant Field Values

DEFAULT_SERVERS

public static final String DEFAULT_SERVERS

See Also:

Constant Field Values

DEFAULT_IS_CUSTOM_RESOLVER

public static final boolean DEFAULT_IS_CUSTOM_RESOLVER

See Also:

Constant Field Values

Constructor Detail

DNSCacheManager

public DNSCacheManager()

Method Detail

clone

public Object clone()

Specified by:

clone in interface ConfigElement

Specified by:

clone in interface TestElement

Overrides:

clone in class AbstractTestElement

resolve

public InetAddress[] resolve(String host)
                      throws UnknownHostException

Resolves address using system or custom DNS resolver

Specified by:

resolve in interface org.apache.http.conn.DnsResolver

Throws:

UnknownHostException

testIterationStart

public void testIterationStart(LoopIterationEvent event)

Each time through a Thread Group's test script, an iteration event is fired for each thread. This will be after the test elements have been cloned, so in general the instance will not be the same as the ones the start/end methods call. Clean DNS cache if appropriate check-box was selected

Specified by:

testIterationStart in interface TestIterationListener

clear

public void clear()

Clear the TestElement of all data.

Specified by:

clear in interface TestElement

Overrides:

clear in class AbstractTestElement

addServer

public void addServer(String dnsServer)

getServers

public CollectionProperty getServers()

isClearEachIteration

public boolean isClearEachIteration()

Clean DNS cache each iteration

Returns:

boolean

setClearEachIteration

public void setClearEachIteration(boolean clear)

Clean DNS cache each iteration

isCustomResolver

public boolean isCustomResolver()

setCustomResolver

public void setCustomResolver(boolean isCustomResolver)