org.javasimon.javaee
Class HttpStopwatchSource

java.lang.Object
  org.javasimon.source.AbstractStopwatchSource<javax.servlet.http.HttpServletRequest>
      org.javasimon.javaee.HttpStopwatchSource

All Implemented Interfaces:

MonitorSource<javax.servlet.http.HttpServletRequest,Stopwatch>, StopwatchSource<javax.servlet.http.HttpServletRequest>

public class HttpStopwatchSource
extends AbstractStopwatchSource<javax.servlet.http.HttpServletRequest>

Provide stopwatch source for HTTP Servlet request. Used by SimonServletFilter as default stopwatch source. Can be overridden to customize monitored HTTP Requests and their related Simon name.

To select which HTTP Request should be monitored method isMonitored(javax.servlet.http.HttpServletRequest) can be overridden. Default implementation monitors everything except for typical resource-like requests (images, JS/CSS, ...).

Author:

gquintana, Richard "Virgo" Richter

Field Summary

static String	DEFAULT_SIMON_PREFIX Default prefix for web filter Simons if no "prefix" init parameter is used.
private Replacer	jsessionParameterReplacer
private String	prefix Simon prefix, can be set to null.
private Replacer	trailingStuffReplacer
private Replacer	unallowedCharacterReplacer

Constructor Summary

HttpStopwatchSource(Manager manager)

Method Summary

Stopwatch	getMonitor(javax.servlet.http.HttpServletRequest request) Get a stopwatch for given HTTP request.
protected String	getMonitorName(javax.servlet.http.HttpServletRequest request) Returns Simon name for the specified HTTP request with the specified prefix.
String	getPrefix()
String	getReplaceUnallowed()
boolean	isMonitored(javax.servlet.http.HttpServletRequest httpServletRequest) Indicates whether the HTTP Request should be monitored - method is intended for override.
static StopwatchSource<javax.servlet.http.HttpServletRequest>	newCacheStopwatchSource(StopwatchSource<javax.servlet.http.HttpServletRequest> stopwatchSource) Wraps given stop watch source in a cache.
protected String	removeJSessionIdFromUri(String uri) Removes JSESSIONID parameter from URI.
protected String	removeTrailingStuff(String uri) Removes any trailing slashes followed by other characters if none of them is alphabetic.
protected String	requestToStringForMonitorName(javax.servlet.http.HttpServletRequest request) Performs the first step in getting the monitor name from the specified HTTP request - here any custom ignore logic should happen.
void	setPrefix(String prefix)
void	setReplaceUnallowed(String replaceUnallowed)

Methods inherited from class org.javasimon.source.AbstractStopwatchSource

getManager, start

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_SIMON_PREFIX

public static final String DEFAULT_SIMON_PREFIX

Default prefix for web filter Simons if no "prefix" init parameter is used.

See Also:

Constant Field Values

prefix

private String prefix

Simon prefix, can be set to null.

unallowedCharacterReplacer

private Replacer unallowedCharacterReplacer

jsessionParameterReplacer

private Replacer jsessionParameterReplacer

trailingStuffReplacer

private Replacer trailingStuffReplacer

Constructor Detail

HttpStopwatchSource

public HttpStopwatchSource(Manager manager)

Method Detail

getPrefix

public String getPrefix()

setPrefix

public void setPrefix(String prefix)

getReplaceUnallowed

public String getReplaceUnallowed()

setReplaceUnallowed

public void setReplaceUnallowed(String replaceUnallowed)

getMonitorName

protected final String getMonitorName(javax.servlet.http.HttpServletRequest request)

Returns Simon name for the specified HTTP request with the specified prefix. By default it contains URI without parameters with all slashes replaced for dots (slashes then determines position in Simon hierarchy). Method can NOT be overridden, but some of the following steps can:

1. the request is transformed to the string (requestToStringForMonitorName(javax.servlet.http.HttpServletRequest), can be overridden),
2. the characters that are not allowed as part of the Simon name are replaced with underscore (_) - replacement regex can be changed with setReplaceUnallowed(String),
3. any subsequent slashes and dots are replaced with a single dot (Manager.HIERARCHY_DELIMITER)

Specified by:

getMonitorName in class AbstractStopwatchSource<javax.servlet.http.HttpServletRequest>

Parameters:

request - HTTP request

Returns:

fully qualified name of the Simon

See Also:

requestToStringForMonitorName(javax.servlet.http.HttpServletRequest)

requestToStringForMonitorName

protected String requestToStringForMonitorName(javax.servlet.http.HttpServletRequest request)

Performs the first step in getting the monitor name from the specified HTTP request - here any custom ignore logic should happen. By default the name is URI (without parameters - see HttpServletRequest.getRequestURI()) with JSessionID removed (see removeJSessionIdFromUri(String)) and any trailing stuff removed (see removeTrailingStuff(String)). This method can be overridden for two typical reasons:

• Name of the monitor (Stopwatch) should be based on something else then URI,
• there are other parts of the name that should be modified or ignored (e.g., REST parameters that are part of the URI).

Parameters:

request - HTTP request

Returns:

preprocessed URI that will be converted to the Simon name

See Also:

getMonitorName(javax.servlet.http.HttpServletRequest), removeJSessionIdFromUri(String)

removeJSessionIdFromUri

protected String removeJSessionIdFromUri(String uri)

Removes JSESSIONID parameter from URI. By default it is not necessary to handle parameters, as incoming URI already is without parameters, but JSESSIONID sometimes come before parameters in other forms and this method tries to remove such forms.

Called by default implementation of requestToStringForMonitorName(javax.servlet.http.HttpServletRequest) and extracted so it can be used by any overriding implementation of the same method. Method can be overridden if the default behavior is not sufficient.

Parameters:

uri - preprocessed URI that may contain JSessionID

Returns:

preprocessed URI without JSessionID

See Also:

requestToStringForMonitorName(javax.servlet.http.HttpServletRequest)

removeTrailingStuff

protected String removeTrailingStuff(String uri)

Removes any trailing slashes followed by other characters if none of them is alphabetic. This should take care of some REST parameters (numeric id-s) and it also removes trailing slashes to avoid empty local Simon names which is forbidden.

Called by default implementation of requestToStringForMonitorName(javax.servlet.http.HttpServletRequest) and extracted so it can be used by any overriding implementation of the same method. Method can be overridden if the default behavior is not sufficient.

Parameters:

uri - preprocessed URI that may contain JSessionID

Returns:

preprocessed URI without JSessionID

See Also:

requestToStringForMonitorName(javax.servlet.http.HttpServletRequest)

isMonitored

public boolean isMonitored(javax.servlet.http.HttpServletRequest httpServletRequest)

Indicates whether the HTTP Request should be monitored - method is intended for override. Default behavior ignores URIs ending with .css, .png, .gif, .jpg and .js (ignores casing).

Specified by:

isMonitored in interface MonitorSource<javax.servlet.http.HttpServletRequest,Stopwatch>

Overrides:

isMonitored in class AbstractStopwatchSource<javax.servlet.http.HttpServletRequest>

Parameters:

httpServletRequest - HTTP Request

Returns:

true to enable request monitoring, false either

getMonitor

public Stopwatch getMonitor(javax.servlet.http.HttpServletRequest request)

Get a stopwatch for given HTTP request.

Specified by:

getMonitor in interface MonitorSource<javax.servlet.http.HttpServletRequest,Stopwatch>

Overrides:

getMonitor in class AbstractStopwatchSource<javax.servlet.http.HttpServletRequest>

Parameters:

request - Method HTTP request

Returns:

Stopwatch for the HTTP request

newCacheStopwatchSource

public static StopwatchSource<javax.servlet.http.HttpServletRequest> newCacheStopwatchSource(StopwatchSource<javax.servlet.http.HttpServletRequest> stopwatchSource)

Wraps given stop watch source in a cache.

Parameters:

stopwatchSource - Stopwatch source

Returns:

Cached stopwatch source