org.apache.tomcat.jdbc.pool.interceptor

## Class StatementDecoratorInterceptor

- java.lang.Object
- - org.apache.tomcat.jdbc.pool.JdbcInterceptor
  - - org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor
    - - org.apache.tomcat.jdbc.pool.interceptor.StatementDecoratorInterceptor

- All Implemented Interfaces:
    InvocationHandler
  Direct Known Subclasses:
    StatementCache

      public class StatementDecoratorInterceptor
      extends AbstractCreateStatementInterceptor

  Implementation of JdbcInterceptor that proxies resultSets and statements.
  Author:
    Guillermo Fernandes

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `StatementDecoratorInterceptor.ResultSetProxy`
    `protected class` | `StatementDecoratorInterceptor.StatementProxy<T extends Statement>` Class to measure query execute time.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected static String` | `EXECUTE_QUERY`
    `protected static String` | `GET_GENERATED_KEYS`
    `protected static String` | `GET_RESULTSET`
    `protected static String[]` | `RESULTSET_TYPES`
    `protected static Constructor<?>` | `resultSetConstructor` the constructor to create the resultSet proxies

    - ### Fields inherited from class org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor

      `constructors, CREATE_STATEMENT, CREATE_STATEMENT_IDX, EXECUTE, EXECUTE_BATCH, EXECUTE_TYPES, EXECUTE_UPDATE, PREPARE_CALL, PREPARE_CALL_IDX, PREPARE_STATEMENT, PREPARE_STATEMENT_IDX, STATEMENT_TYPE_COUNT, STATEMENT_TYPES`

    - ### Fields inherited from class org.apache.tomcat.jdbc.pool.JdbcInterceptor

      `CLOSE_VAL, EQUALS_VAL, GETCONNECTION_VAL, HASHCODE_VAL, ISCLOSED_VAL, ISVALID_VAL, ISWRAPPERFOR_VAL, properties, TOSTRING_VAL, UNWRAP_VAL`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `StatementDecoratorInterceptor()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `closeInvoked()` Method invoked when the operation `Connection.close()` is invoked.
    `protected Object` | `createDecorator(Object proxy, Method method, Object[] args, Object statement, Constructor<?> constructor, String sql)` Creates a proxy for a Statement.
    `Object` | `createStatement(Object proxy, Method method, Object[] args, Object statement, long time)` Creates a statement interceptor to monitor query response times
    `protected Constructor<?>` | `getResultSetConstructor()`
    `protected boolean` | `isExecuteQuery(Method method)`
    `protected boolean` | `isExecuteQuery(String methodName)`
    `protected boolean` | `isResultSet(Method method, boolean process)`

    - ### Methods inherited from class org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor

      `getConstructor, invoke, isExecute, isStatement, process, reset`

    - ### Methods inherited from class org.apache.tomcat.jdbc.pool.JdbcInterceptor

      `compare, compare, disconnected, getNext, getProperties, isUseEquals, poolClosed, poolStarted, setNext, setProperties, setUseEquals`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### EXECUTE_QUERY

          protected static final String EXECUTE_QUERY

      See Also:
        Constant Field Values

    - #### GET_GENERATED_KEYS

          protected static final String GET_GENERATED_KEYS

      See Also:
        Constant Field Values

    - #### GET_RESULTSET

          protected static final String GET_RESULTSET

      See Also:
        Constant Field Values

    - #### RESULTSET_TYPES

          protected static final String[] RESULTSET_TYPES

    - #### resultSetConstructor

          protected static volatile Constructor<?> resultSetConstructor

      the constructor to create the resultSet proxies

  - ### Constructor Detail

    - #### StatementDecoratorInterceptor

          public StatementDecoratorInterceptor()

  - ### Method Detail

    - #### closeInvoked

          public void closeInvoked()

      Description copied from class: `AbstractCreateStatementInterceptor`
      Method invoked when the operation `Connection.close()` is invoked.
      Specified by:
        `closeInvoked` in class `AbstractCreateStatementInterceptor`

    - #### getResultSetConstructor

          protected Constructor<?> getResultSetConstructor()
                                                    throws NoSuchMethodException

      Throws:
        `NoSuchMethodException`

    - #### createStatement

          public Object createStatement(Object proxy,
                               Method method,
                               Object[] args,
                               Object statement,
                               long time)

      Creates a statement interceptor to monitor query response times
      Specified by:
        `createStatement` in class `AbstractCreateStatementInterceptor`
      Parameters:
        `proxy` - the actual proxy object
        `method` - the method that was called. It will be one of the methods defined in `AbstractCreateStatementInterceptor.STATEMENT_TYPES`
        `args` - the arguments to the method
        `statement` - the statement that the underlying connection created
        `time` - Elapsed time
      Returns:
        a `Statement` object

    - #### createDecorator

          protected Object createDecorator(Object proxy,
                               Method method,
                               Object[] args,
                               Object statement,
                               Constructor<?> constructor,
                               String sql)
                                    throws InstantiationException,
                                           IllegalAccessException,
                                           InvocationTargetException

      Creates a proxy for a Statement.
      Parameters:
        `proxy` - The proxy object on which the method that triggered the creation of the statement was called.
        `method` - The method that was called on the proxy
        `args` - The arguments passed as part of the method call to the proxy
        `statement` - The statement object that is to be proxied
        `constructor` - The constructor for the desired proxy
        `sql` - The sql of of the statement
      Returns:
        A new proxy for the Statement
      Throws:
        `InstantiationException` - Couldn't instantiate object
        `IllegalAccessException` - Inaccessible constructor
        `InvocationTargetException` - Exception thrown from constructor

    - #### isExecuteQuery

          protected boolean isExecuteQuery(String methodName)

    - #### isExecuteQuery

          protected boolean isExecuteQuery(Method method)

    - #### isResultSet

          protected boolean isResultSet(Method method,
                            boolean process)

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