Module org.postgresql.pljava.internal
Package org.postgresql.pljava.jdbc

Class Invocation

java.lang.Object
org.postgresql.pljava.jdbc.Invocation
public class Invocation extends Object
One invocation, from PostgreSQL, of functionality implemented using PL/Java.

This class is the Java counterpart of the struct Invocation_ in the C code, but while there is a new stack-allocated C structure on every entry from PG to PL/Java, no instance of this class is created unless requested (with current(); once requested, a reference to it is saved in the C struct for the duration of the invocation.

One further piece of magic applies to set-returning functions. Under the value-per-call protocol, there is technically a new entry into PL/Java, and a new C Invocation_ struct, for every row to be returned, but that low-level complication is hidden at this level: a single instance of this class, if once requested, will be remembered throughout the value-per-call sequence of calls.

Author:
Thomas Hallgren

  • Method Details

    • getNestingLevel

      public int getNestingLevel()
      Returns:
      The nesting level of this invocation

    • onExit

      public void onExit(boolean withError) throws SQLException
      Called from the backend when the invokation exits. Should not be invoked any other way.
      Throws:
      SQLException

    • current

      public static Invocation current()
      Returns:
      The current invocation