app_java Module

Konstantin Mosesov

Edited by

Konstantin Mosesov

   Copyright © 2013, 2014 Konstantin Mosesov
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview
        2. Dependencies

              2.1. Kamailio Modules
              2.2. External Libraries or Applications

        3. Java runtime

              3.1. JRE or JDK is required to use this module

        4. Parameters

              4.1. class_name (string)
              4.2. child_init_method (string)
              4.3. java_options (string)
              4.4. force_cmd_exec (int)

        5. Functions

              5.1. Common requirements
              5.2. java_method_exec(method, method_signature, [param1[,
                      param2[, ...]]])

              5.3. java_staticmethod_exec(method, method_signature,
                      [param1[, param2[, ...]]])

              5.4. java_s_method_exec(method, method_signature, [param1[,
                      param2[, ...]]])

              5.5. java_s_staticmethod_exec(method, method_signature,
                      [param1[, param2[, ...]]])

        6. Java Module API

              6.1. Minimal program skeleton

   List of Examples

   1.1. Set class_name parameter
   1.2. Set child_init_method parameter
   1.3. Set java_options parameter
   1.4. Set java_options parameter (live configuration)
   1.5. Set java_options parameter (verbose configuration)
   1.6. Set java_options parameter (debug configuration)
   1.7. Set force_cmd_exec parameter
   1.8. Signature: "V"
   1.9. Signature: "Ljava/lang/String;I"
   1.10. Signature: "ZB"
   1.11. Signature: "V"
   1.12. Signature: "Ljava/lang/String;I"
   1.13. Signature: "ZB"
   1.14. Signature: "V"
   1.15. Signature: "Ljava/lang/String;I"
   1.16. Signature: "ZB"
   1.17. Signature: "V"
   1.18. Signature: "Ljava/lang/String;I"
   1.19. Signature: "ZB"
   1.20. Minimal program skeleton

Chapter 1. Admin Guide

   Table of Contents

   1. Overview
   2. Dependencies

        2.1. Kamailio Modules
        2.2. External Libraries or Applications

   3. Java runtime

        3.1. JRE or JDK is required to use this module

   4. Parameters

        4.1. class_name (string)
        4.2. child_init_method (string)
        4.3. java_options (string)
        4.4. force_cmd_exec (int)

   5. Functions

        5.1. Common requirements
        5.2. java_method_exec(method, method_signature, [param1[, param2[,
                ...]]])

        5.3. java_staticmethod_exec(method, method_signature, [param1[,
                param2[, ...]]])

        5.4. java_s_method_exec(method, method_signature, [param1[,
                param2[, ...]]])

        5.5. java_s_staticmethod_exec(method, method_signature, [param1[,
                param2[, ...]]])

   6. Java Module API

        6.1. Minimal program skeleton

1. Overview

   This module allows execution of Java compiled classes from the Kamailio
   config file, exporting functions to access the SIP message from Java
   using the Java Native Interface (JNI).

2. Dependencies

   2.1. Kamailio Modules
   2.2. External Libraries or Applications

2.1. Kamailio Modules

   The following modules must be loaded before this module:
     * none.

2.2. External Libraries or Applications

   The following packages are runtime libraries, required to launch
     * java-common Base of all Java packages.
     * default-jre Standard Java or Java compatible Runtime.
     * gcj-jre Java runtime environment using GIJ/classpath.
     * libgcj12 (>=12) Java runtime library for use with gcj.

   The following packages are optional, required for development
     * ant Java based build tool like make.
     * ant-contrib Collection of tasks, types and other tools for Apache
       Ant.
     * ant-gcj Java based build tool like make (GCJ).
     * default-jdk Standard Java or Java compatible Development Kit
     * gcj-jdk gcj and classpath development tools for Java(TM)
     * libgcj13-dev (>=12) Java development headers for use with gcj
     * jdk JDK Development Kit (either oracle jdk or openjdk)

   The following libraries or applications must be compiled before running
   Kamailio with this module loaded:

   The following packages are runtime libraries, required to launch
     * <class_name>.class
     * kamailio.jar

3. Java runtime

   3.1. JRE or JDK is required to use this module

3.1. JRE or JDK is required to use this module

   Java runtime library (JRE and JDK for building app_java) is required to
   use this module.

4. Parameters

   4.1. class_name (string)
   4.2. child_init_method (string)
   4.3. java_options (string)
   4.4. force_cmd_exec (int)

4.1. class_name (string)

   The class name should have the same compiled file name. If the value is
   "Kamailio", then the compiled file should be named as "Kamailio.class".

   Default value is “Kamailio”.

   Example 1.1. Set class_name parameter
...
modparam("app_java", "class_name", "Kamailio")
...

4.2. child_init_method (string)

   TBD.

   Default value is “child_init”.

   Example 1.2. Set child_init_method parameter
...
modparam("app_java", "child_init_method", "my_mod_init")
...

4.3. java_options (string)

   Java options for Java Virtual Machine. For more info read java docs

   Default value is “-Djava.compiler=NONE”.

   Example 1.3. Set java_options parameter
...
modparam("app_java", "java_options", "-Djava.compiler=NONE")
...

   Example 1.4. Set java_options parameter (live configuration)
...
# Assumes "application java folder" is located at /opt/kamailio/java
modparam("app_java", "java_options", "-Djava.compiler=NONE
    -Djava.class.path=/path/to/kamailio/modules:/opt/kamailio/java:
    /opt/kamailio/java/kamailio.jar")
...

   Example 1.5. Set java_options parameter (verbose configuration)
...
# Assumes "application java folder" is located at /opt/kamailio/java
modparam("app_java", "java_options", "-verbose:gc,class,jni
    -Djava.compiler=NONE -Djava.class.path=/path/to/kamailio/modules:
    /opt/kamailio/java:/opt/kamailio/java/kamailio.jar")
...

   Example 1.6. Set java_options parameter (debug configuration)
...
# Assumes "application java folder" is located at /opt/kamailio/java
modparam("app_java", "java_options", "-Xdebug -verbose:gc,class,jni
    -Djava.compiler=NONE -Djava.class.path=/path/to/kamailio/modules:
    /opt/kamailio/java:/opt/kamailio/java/kamailio.jar")
...

4.4. force_cmd_exec (int)

   This parameter forces execution a kamailio command with java native
   method “KamExec”. # Note: this is an untested yet feature, may cause
   (but may not) a memory leaks if used from embedded languages.

   Default value is “0 (off)”.

   Example 1.7. Set force_cmd_exec parameter
...
modparam("app_java", "force_cmd_exec", 1)
...

5. Functions

   5.1. Common requirements
   5.2. java_method_exec(method, method_signature, [param1[, param2[,
          ...]]])

   5.3. java_staticmethod_exec(method, method_signature, [param1[,
          param2[, ...]]])

   5.4. java_s_method_exec(method, method_signature, [param1[, param2[,
          ...]]])

   5.5. java_s_staticmethod_exec(method, method_signature, [param1[,
          param2[, ...]]])

5.1.  Common requirements

   Each function has a required parameter “method_signature”. For more
   info see Determine the signature of a method. Signature represents the
   variable type. The mapping between the Java type and C type is
                Type     Chararacter
                boolean      Z
                byte         B
                char         C
                double       D
                float        F
                int          I
                long         J
                object       L
                short        S
                void         V
                Note that to specify an object, the "L" is followed by the
                object's class name and ends with a semi-colon, ';' .

   app_java supports the following signatures:
                Primitives: Z,B,C,D,F,I,J,L,S,V
                Objects:
                        Ljava/lang/Boolean;
                        Ljava/lang/Byte;
                        Ljava/lang/Character;
                        Ljava/lang/Double;
                        Ljava/lang/Float;
                        Ljava/lang/Integer;
                        Ljava/lang/Long;
                        Ljava/lang/Short;
                        Ljava/lang/String;
                        NULL parameter: V

        Each parameter passed to function will be cast according to given signat
ure.

        Parameters are optional, omitting a parameter meant the passed value is
NULL.
        Parameters count should be exactly the same as signature count.
        Note 1: Arrays representation (symbol '[') is not supported yet.
        Note 2: You shall use a correct signature, e.g. the following examples o
f
        combinations are invalid:
        java_method_exec("ExampleMethod", "ZI", "False");
        java_method_exec("ExampleMethod", "LI", "something", "5");

5.2. java_method_exec(method, method_signature, [param1[, param2[, ...]]])

   Executes a java class method method. Parameter method_signature is
   required.
     * Example 1.8. Signature: "V"
       Kamailio prototype
java_method_exec("ExampleMethod", "V");
       Java prototype
public int ExampleMethod();
       Example of usage:
# Kamailio
java_method_exec("ExampleMethod", "V");

# Java
public int ExampleMethod()
{
    ... do something;
    return 1;
}
     * Example 1.9. Signature: "Ljava/lang/String;I"
       Kamailio prototype
java_method_exec("ExampleMethod", "Ljava/lang/String;I", "Hello world", "5");
       Java prototype
public int ExampleMethod(String param1, int param2);
       In the above scenario parameter 2 ("5") will be cast to integer
       representation.
       Example of usage:
# Kamailio
java_method_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");

# Java
public int ExampleMethod(String SipMessageBuffer, int SipMessageLength)
{
    ... do something with buffer;
    return 1;
}
     * Example 1.10. Signature: "ZB"
       Kamailio prototype
java_method_exec("ExampleMethod", "ZB", "true", "0x05");
       Java prototype
public int ExampleMethod(boolean param1, byte param2);
       In the above scenario parameter 1 ("true") will be cast to boolean
       representation.
       Example of usage:
# Kamailio
java_method_exec("ExampleMethod", "ZB", "true", "0x05");

# Java
public int ExampleMethod(boolean flagSet, byte bFlag);
{
    if (flagSet)
    {
        ... do something with flags;
    }

    return 1;
}

5.3. java_staticmethod_exec(method, method_signature, [param1[, param2[,
...]]])

   Executes a Java static method method. Parameter method_signature is
   required.
     * Example 1.11. Signature: "V"
       Kamailio prototype
java_staticmethod_exec("ExampleMethod", "V");
       Java prototype
public static int ExampleMethod();
       Example of usage:
# Kamailio
java_staticmethod_exec("ExampleMethod", "V");

# Java
public static int ExampleMethod()
{
    ... do something;
    return 1;
}
     * Example 1.12. Signature: "Ljava/lang/String;I"
       Kamailio prototype
java_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "Hello world", "5
");
       Java prototype
public static int ExampleMethod(String param1, int param2);
       In the above scenario parameter 2 ("5") will be cast to integer
       representation.
       Example of usage:
# Kamailio
java_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");

# Java
public static int ExampleMethod(String SipMessageBuffer, int SipMessageLength)
{
    ... do something with buffer;
    return 1;
}
     * Example 1.13. Signature: "ZB"
       Kamailio prototype
java_staticmethod_exec("ExampleMethod", "ZB", "true", "0x05");
       Java prototype
public static int ExampleMethod(boolean param1, byte param2);
       In the above scenario parameter 1 ("true") will be cast to boolean
       representation.
       Example of usage:
# Kamailio
java_staticmethod_exec("ExampleMethod", "ZB", "true", "0x05");

# Java
public static int ExampleMethod(boolean flagSet, byte bFlag);
{
    if (flagSet)
    {
        ... do something with flags;
    }

    return 1;
}

5.4. java_s_method_exec(method, method_signature, [param1[, param2[, ...]]])

   Executes a Java class synchronized method method. Parameter
   method_signature is required.

   For more info see Synchronized Methods
     * Example 1.14. Signature: "V"
       Kamailio prototype
java_s_method_exec("ExampleMethod", "V");
       Java prototype
public synchronized int ExampleMethod();
       Example of usage:
# Kamailio
java_s_method_exec("ExampleMethod", "V");

# Java
public synchronized int ExampleMethod()
{
    ... do something;
    return 1;
}
     * Example 1.15. Signature: "Ljava/lang/String;I"
       Kamailio prototype
java_s_method_exec("ExampleMethod", "Ljava/lang/String;I", "Hello world", "5");
       Java prototype
public synchronized int ExampleMethod(String param1, int param2);
       In the above scenario parameter 2 ("5") will be cast to integer
       representation.
       Example of usage:
# Kamailio
java_s_method_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");

# Java
public synchronized int ExampleMethod(String SipMessageBuffer, int SipMessageLen
gth)
{
    ... do something with buffer;
    return 1;
}
     * Example 1.16. Signature: "ZB"
       Kamailio prototype
java_s_method_exec("ExampleMethod", "ZB", "true", "0x05");
       Java prototype
public synchronized int ExampleMethod(boolean param1, byte param2);
       In the above scenario parameter 1 ("true") will be cast to boolean
       representation.
       Example of usage:
# Kamailio
java_s_method_exec("ExampleMethod", "ZB", "true", "0x05");

# Java
public synchronized int ExampleMethod(boolean flagSet, byte bFlag);
{
    if (flagSet)
    {
        ... do something with flags;
    }

    return 1;
}

5.5. java_s_staticmethod_exec(method, method_signature, [param1[, param2[,
...]]])

   Executes a java synchronized static method method. Parameter
   method_signature is required.

   For more info see Synchronized Methods
     * Example 1.17. Signature: "V"
       Kamailio prototype
java_s_staticmethod_exec("ExampleMethod", "V");
       Java prototype
public static synchronized int ExampleMethod();
       Example of usage:
# Kamailio
java_s_staticmethod_exec("ExampleMethod", "V");

# Java
public static synchronized int ExampleMethod()
{
    ... do something;
    return 1;
}
     * Example 1.18. Signature: "Ljava/lang/String;I"
       Kamailio prototype
java_s_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "Hello world",
"5");
       Java prototype
public static synchronized int ExampleMethod(String param1, int param2);
       In the above scenario parameter 2 ("5") will be cast to integer
       representation.
       Example of usage:
# Kamailio
java_s_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");

# Java
public static synchronized int ExampleMethod(String SipMessageBuffer, int SipMes
sageLength)
{
    ... do something with buffer;
    return 1;
}
     * Example 1.19. Signature: "ZB"
       Kamailio prototype
java_s_staticmethod_exec("ExampleMethod", "ZB", "true", "0x05");
       Java prototype
public static synchronized int ExampleMethod(boolean param1, byte param2);
       In the above scenario parameter 1 ("true") will be cast to boolean
       representation.
       Example of usage:
# Kamailio
java_s_staticmethod_exec("ExampleMethod", "ZB", "true", "0x05");

# Java
public static synchronized int ExampleMethod(boolean flagSet, byte bFlag);
{
    if (flagSet)
    {
        ... do something with flags;
    }

    return 1;
}

6. Java Module API

   6.1. Minimal program skeleton

6.1. Minimal program skeleton

   Example 1.20. Minimal program skeleton

import org.siprouter.*;
import org.siprouter.NativeInterface.*;

public class Kamailio extends NativeMethods
{
    /* Here you should specify a full path to app_java.so */
    static
    {
        System.load("/opt/kamailio/lib/kamailio/modules/app_java.so");
    }

    /* Constructor. Do not remove !!! */
    public Kamailio()
    {
    }

    /*
        This method should be executed for each children process, immediately af
ter forking.
        Required. Do not remove !!!
    */
    public int child_init(int rank)
    {
        return 1;
    }
}
