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command_watch
btpka3 edited this page Oct 11, 2018
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Display the details of specified class and method .
Watch paramters , return value/exception.
ga?> watch -f com.your.XxxApi yyyMthod "{params, returnObj, throwExp}" -x 3-
-f: watch after method invocation, if not specified,returnObjandthrowExpwill be null. -
"{params, returnObj, throwExp}": It's a ONGL Collection Construction expression. When expression contains space, expression must be quoted. This example can also be written in{params,returnObj,throwExp}(without space and double quote). -
-x 3: Display nested object at most 3 level. It's very useful for complex/nested/combined objects/collections.
ga?>help watch
+---------+----------------------------------------------------------------------------------+
| USAGE | -[bfesx:En:] class-pattern method-pattern express condition-express |
| | Display the details of specified class and method |
+---------+----------------------------------------------------------------------------------+
| OPTIONS | [b] | Watch before invocation |
| | -----------------+-------------------------------------------------------------- |
| | [f] | Watch after invocation |
| | -----------------+-------------------------------------------------------------- |
| | [e] | Watch after throw exception |
| | -----------------+-------------------------------------------------------------- |
| | [s] | Watch after successful invocation |
| | -----------------+-------------------------------------------------------------- |
| | [x:] | Expand level of object (0 by default) |
| | -----------------+-------------------------------------------------------------- |
| | [E] | Enable regular expression to match (wildcard matching by def |
| | | ault) |
| | -----------------+-------------------------------------------------------------- |
| | [n:] | Threshold of execution times |
| | -----------------+-------------------------------------------------------------- |
| | class-pattern | Path and classname of Pattern Matching |
| | -----------------+-------------------------------------------------------------- |
| | method-pattern | Method of Pattern Matching |
| | -----------------+-------------------------------------------------------------- |
| | express | express, write by OGNL. |
| | | |
| | | FOR EXAMPLE params[0] |
| | | params[0]+params[1] |
| | | returnObj |
| | | throwExp |
| | | target |
| | | clazz |
| | | method |
| | | |
| | | THE STRUCTURE |
| | | target : the object |
| | | clazz : the object's class |
| | | method : the constructor or method |
| | | params[0..n] : the parameters of method |
| | | returnObj : the returned object of method |
| | | throwExp : the throw exception of method |
| | | isReturn : the method ended by return |
| | | isThrow : the method ended by throwing exception |
| | -----------------+-------------------------------------------------------------- |
| | condition-expre | Conditional expression by OGNL |
| | ss | |
| | | FOR EXAMPLE |
| | | TRUE : 1==1 |
| | | TRUE : true |
| | | FALSE : false |
| | | TRUE : params.length>=0 |
| | | FALSE : 1==2 |
| | | |
| | | THE STRUCTURE |
| | | target : the object |
| | | clazz : the object's class |
| | | method : the constructor or method |
| | | params[0..n] : the parameters of method |
| | | returnObj : the returned object of method |
| | | throwExp : the throw exception of method |
| | | isReturn : the method ended by return |
| | | isThrow : the method ended by throwing exception |
+---------+----------------------------------------------------------------------------------+
| EXAMPLE | watch -Eb org\.apache\.commons\.lang\.StringUtils isBlank params[0] |
| | watch -b org.apache.commons.lang.StringUtils isBlank params[0] |
| | watch -f org.apache.commons.lang.StringUtils isBlank returnObj |
| | watch -bf *StringUtils isBlank params[0] |
| | watch *StringUtils isBlank params[0] |
| | watch *StringUtils isBlank params[0] 'params[0].length==1' |
| | watch *StringUtils isBlank params[0] '#cost>100' |
+---------+----------------------------------------------------------------------------------+