This document covers the following topics:
In the table below, the following metasymbols and informal terms are used for the IDL.
The metasymbols [ and ] surround optional lexical entities.
The informal term numbernumber1[.number2
| Software AG IDL | Description | Java Data Types | Note |
|---|---|---|---|
A |
Alphanumeric | String |
1, 3 |
AV |
Alphanumeric variable length | String |
|
AV[ |
Alphanumeric variable length with maximum length | String |
1 |
B |
Binary | byte[] |
1, 6 |
BV |
Binary variable length | byte[] |
|
BV[ |
Binary variable length with maximum length | byte[] |
1 |
D |
Date | java.util.Date |
5 |
F4 |
Floating point (small) | float |
2 |
F8 |
Floating point (large) | double |
2 |
I1 |
Integer (small) | byte |
|
I2 |
Integer (medium) | short |
|
I4 |
Integer (large) | int |
|
K |
Kanji | String |
1 |
KV |
Kanji variable length | String |
|
KV[ |
Kanji variable length with maximum length | String |
1 |
L |
Logical | boolean |
|
N |
Unpacked decimal | java.math.BigDecimal |
4 |
NU |
Unpacked decimal unsigned | java.math.BigDecimal |
4 |
P |
Packed decimal | java.math.BigDecimal |
4 |
PU |
Packed decimal unsigned | java.math.BigDecimal |
4 |
T |
Time | java.util.Date |
5 |
U |
Unicode | String |
7 |
UV |
Unicode variable length | String |
7 |
UV |
Unicode variable length with maximum length | String |
7 |
Notes:
IN and INOUT parameters) for type A, a blank string will be used.
number1+number2) is 99,
which is the maximum that EntireX supports. See IDL Data Types.
If you connect two endpoints, the total number of digits used must be lower or equal than the maxima of both endpoints. For the supported total number of digits for endpoints, see the notes under data types N, NU, P and PU in section Mapping IDL Data Types to target language environment C | CL | COBOL | DCOM | .NET | Java | Natural | PL/I | RPG | XML.
If you use the value null (null pointer) for direction IN (for IN and INOUT parameters), the value 0 (or 0.0) will be sent. See Mapping the Direction Attributes In, Out, InOut.
IN and INOUT parameters) for types D/T, the current date/time will be used. You
change this with the property entirex.marshal.date. Setting
entirex.marshal.date=null will map the value null to the invalid date
0000-01-01 of the RPC marshalling. This is the invalid date value in Natural,
too. With this setting the invalid date as an output parameter will be mapped
to null. The default is to map the invalid date to 0001-01-01.
IN and INOUT parameters) for type B, all binary values will be set to
zero.
Please note also hints and restrictions on the Software AG IDL data types valid for all programming language bindings. See IDL Data Types.
The library name as specified in the IDL file is sent from a client to the server. Special characters are not replaced. The library alias is not sent to the server.
In the RPC server, the IDL library name sent may be used to locate the target server. See Locating and Calling the Target Server under z/OS (CICS, Batch, IMS) | UNIX | Windows | Micro Focus | BS2000/OSD | z/VSE (CICS, Batch) | IBM i.
The library name as given in the library definition of the IDL file is
mapped to the class name of the generated Java classes. See library-definition under Software AG IDL Grammar. For the server interface object,
the names of the class are composed as library name
Interface Object and library name Server. For the
client interface object, no suffix is appended. When the class names are built,
the library name is capitalized to match Java naming conventions.
The special characters '#' and '-' in the library name are replaced by the character '_'.
If there is an alias for the library name in the
library-definition, this alias is used as is to form the
client class name. Therefore, this alias must be a valid Java class name. On
the server side, the alias is used as is to form the class name of the server
class.
Example:
library name Hu#G-O is converted to Hu_g_o
The program name is sent from a client to the server. Special characters are not replaced. The program alias is not sent to the server.
In the RPC server, the IDL program name sent is used to locate the target server. See Locating and Calling the Target Server under z/OS (CICS, Batch, IMS) | UNIX | Windows | Micro Focus | BS2000/OSD | z/VSE (CICS, Batch) | IBM i.
The program name as given in the program-definition
of the IDL file is mapped to method names within the generated Java classes. To
match Java naming conventions the program name is converted to lowercase.
The special characters '#' and '-' in the program name are replaced by the character '_'.
If there is an alias for the program name in the
program-definition, this alias is used as is for the method
name. Therefore, this alias must be a valid Java method name. On the server
side, the alias is used as is for the method name in the server class.
The parameter names are mapped to fields inside the classes (see Mapping the Direction Attributes In, Out, InOut).
Example:
parameter name Hu#G-O is converted to hu_g_o
Arrays in the IDL file are mapped to Java arrays. If an array value does not have the correct number of
dimensions or elements, this will result in a NullPointerException or an
ArrayIndexOutOfBoundsException.
If you use the value null (null pointer) as an input parameter (for IN and INOUT parameters),
an array will be instantiated.
Groups (structures) in the IDL file are mapped to inner classes. If the Bean-compliant generation mode is used, they are mapped to normal classes in their own files. The group members (structure fields) are implemented as public fields of the inner class. If the bean-compliant generation is used, the members (structure fields) are implemented as private fields with getter and setter methods.
The following example shows how to program with groups in a Java
client and server. The IDL program consists of three groups, each with the same
fields, but with different directions. The client shows how to initialize the
fields in the groups for the In and InOut parameters and how to get the results
from the Out and InOut parameters. The server part shows only the implemented
server method, not the other parts of the generated server skeleton. The server
just moves the data from the In parameters to the Out parameters and fills the
gaps. We assume that ClientGroup.class and the client interface object
Libgroup.class are in the same folder. To compile and run the client and the
server you need the entirex.jar. For the server we assume
that LibgroupServer.class and
LibgroupStub.class are in the same folder and
this folder is in the classpath of the EntireX Java RPC Server.
library 'LibGroup' is
program 'Program1' is
define data parameter
1 Group1 (/3) In Out
2 Field01 (A10)
2 Field02 (N2)
2 Field03 (I4)
1 Group2 (/1) In
2 Field01 (A10)
2 Field02 (N2)
2 Field03 (I4)
1 Group3 (/2) Out
2 Field01 (A10)
2 Field02 (N2)
2 Field03 (I4)
end-define
import com.softwareag.entirex.aci.Broker;
import com.softwareag.entirex.aci.BrokerException;
import java.math.BigDecimal;
public class ClientGroup {
public static void main(String[] args) {
try {
Broker broker = new Broker(Libgroup.DEFAULT_BROKERID, "User1");
broker.logon();
// create the wrapper object.
Libgroup lib = new Libgroup(broker, Libgroup.DEFAULT_SERVER);
// /*
// * Using the old style:
// * Get the reference for group1 from wrapper object and
// * fill group1 with data. Since group1 is InOut, there exists a
// * reference.
// */
// Group1[] group1 = lib.getGroup1();
// for (int i = 0; i < group1.length; i++) {
// // create a new instance of each array element of group1.
// group1[i] = new Group1();
// // fill the data in each field.
// group1[i].setField01("group1 " + i);
// group1[i].setField02(new BigDecimal(i));
// group1[i].setField03(2 * i);
// }
/*
* Fill the group1 parameters, using the new methods for indexed access.
*/
Group1[] group1 = lib.getGroup1();
for (int i = 0; i < group1.length; i++) {
Group1 group = new Group1();
group.setField01("group1 " + i);
group.setField02(new BigDecimal(i));
group.setField03(2 * i);
lib.setGroup1(i, group);
}
/*
* Create an instance for group2. There is no reference for group2
* since this is an In parameter. Fill group2 with data.
*/
Group1[] group2 = new Group1[1];
for (int i = 0; i < group2.length; i++) {
// create a new instance of each array element of group2.
group2[i] = new Group1();
// fill the data in each field.
group2[i].setField01("group2 " + i);
group2[i].setField02(new BigDecimal(i));
group2[i].setField03(2 * i);
}
// do the RPC.
lib.program1(group2);
// /*
// * Using the old style:
// * We can use the reference group1, it is not modified.
// */
// for (int i = 0; i < group1.length; i++) {
// // get the data from the group and print.
// System.out.println("Result of Program1; group1[" + i + "] "
// + group1[i].getField01() + ", " + group1[i].getField02() + ", "
// + group1[i].getField03());
// }
/*
* Retrieve the group1 elements, using the new indexed access method.
*/
for (int i = 0; i < 3; i++) {
// get the data from the group and print.
System.out.println("Result of Program1; group1[" + i + "] "
+ lib.getGroup1(i).getField01() + ", "
+ lib.getGroup1(i).getField02() + ", "
+ lib.getGroup1(i).getField03());
}
// /*
// * Using the old style:
// * Get the reference for group3. group3 is Out.
// */
// Group1[] group3 = lib.getGroup3();
// for (int i = 0; i < group3.length; i++) {
// // get the data from the group and print.
// System.out.println("Result of Program1; group3[" + i + "] "
// + group3[i].getField01() + ", " + group3[i].getField02() + ", "
// + group3[i].getField03());
// }
/*
* Retrieve the group3 elements, using the new indexed access method.
*/
for (int i = 0; i < 2; i++) {
// get the data from the group and print.
System.out.println("Result of Program1; group3[" + i + "] "
+ lib.getGroup3(i).getField01() + ", "
+ lib.getGroup3(i).getField02() + ", "
+ lib.getGroup3(i).getField03());
}
broker.logoff();
} catch (BrokerException excep) {
excep.printStackTrace ();
}
}
}
import com.softwareag.entirex.aci.Broker;
import com.softwareag.entirex.aci.BrokerException;
import java.math.BigDecimal;
public class ClientGroup {
public static void main(String[] args) {
try {
Broker broker = new Broker(Libgroup.DEFAULT_BROKERID, "User1");
broker.logon();
// create the wrapper object.
Libgroup lib = new Libgroup(broker, Libgroup.DEFAULT_SERVER);
/* Get the reference for group1 from wrapper object and
* fill group1 with data. Since group1 is InOut, there exists a
* reference.
*/
Group1[] group1 = lib.getGroup1();
for (int i = 0; i < group1.length; i++) {
// create a new instance of each array element of group1.
group1[i] = new Group1();
// fill the data in each field.
group1[i].setField01("group1 " + i);
group1[i].setField02(new BigDecimal(i));
group1[i].setField03(2 * i);
}
/** Create an instance for group2. There is no reference for group2
* since this is an In parameter. Fill group2 with data.
*/
Group1[] group2 = new Group1[1];
for (int i = 0; i < group2.length; i++) {
// create a new instance of each array element of group2.
group2[i] = new Group1();
// fill the data in each field.
group2[i].setField01("group2 " + i);
group2[i].setField02(new BigDecimal(i));
group2[i].setField03(2 * i);
}
// do the RPC.
lib.program1(group2);
// We can use the reference group1, it is not modified.
for (int i = 0; i < group1.length; i++) {
// get the data from the group and print.
System.out.println("Result of Program1; group1[" + i + "] "
+ group1[i].getField01() + ", " + group1[i].getField02() + ", "
+ group1[i].getField03());
}
// Get the reference for group3. group3 is Out.
Group1[] group3 = lib.getGroup3();
for (int i = 0; i < group3.length; i++) {
// get the data from the group and print.
System.out.println("Result of Program1; group3[" + i + "] "
+ group3[i].getField01() + ", " + group3[i].getField02() + ", "
+ group3[i].getField03());
}
broker.logoff();
} catch (BrokerException excep) {
excep.printStackTrace ();
}
}
}
public void program1 (LibgroupServer.Program1Group2[] group2) {
/*
* Program1Group1 is InOut
* Program1Group2 is In
* Program1Group3 is Out
* Move the values from Program1Group2 to Program1Group1 and move the
* value from Program1Group1 to Program1Group3.
*/
int length = Math.min(program1Group1.length, program1Group3.length);
for (int i = 0; i < length; i++) {
if (program1Group3[i] == null)
program1Group3[i] = new Program1Group3();
program1Group3[i].field01 = program1Group1[i].field01;
program1Group3[i].field02 = program1Group1[i].field02;
program1Group3[i].field03 = program1Group1[i].field03;
}
for (int i = length; i < program1Group3.length; i++) {
if (program1Group3[i] == null)
program1Group3[i] = new Program1Group3();
program1Group3[i].field01 = "New Text " + i;
program1Group3[i].field02 = new BigDecimal(10);
program1Group3[i].field03 = 100 + i;
}
// move the values from Program1Group1 to Program1Group3.
length = Math.min(group2.length, program1Group1.length);
for (int i = 0; i < length; i++) {
if (program1Group1[i] == null)
program1Group1[i] = new Program1Group1();
program1Group1[i].field01 = group2[i].field01;
program1Group1[i].field02 = group2[i].field02;
program1Group1[i].field03 = group2[i].field03;
}
for (int i = length; i < program1Group1.length; i++) {
if (program1Group1[i] == null)
program1Group1[i] = new Program1Group1();
program1Group1[i].field01 = "New Text " + i;
program1Group1[i].field02 = new BigDecimal(10);
program1Group1[i].field03 = 100 + i;
}
}
Structures are mapped like Groups. See Mapping Groups and Periodic Groups.
The following example shows how to program with structures in a Java
client and server. The structures are mapped to inner classes of the interface
objects; if Bean-compliant generation is used, the structures
are mapped to normal classes in their own file. The IDL program consists of one
structure that is used with different directions. In the example above for the
groups we have the same fields in each group. This example shows how to
simplify this by using a structure. The structure is defined outside the
program an references to the structure can be used several times in different
programs. The client shows how to initialize the fields in the references of
the structure for the In and InOut parameters and how to get the results from
the Out and InOut parameters. The server part shows only the implemented server
method, not the other parts of the generated server skeleton. The server just
moves the data from the In parameters to the Out parameters and fills the gaps.
We assume that ClientStrct.class and the client interface
object Libstrct.class are in the same folder. To compile
and run the client and the server you need the
entirex.jar. For the server we assume that
LibstrctServer.class and
LibstrctStub.class are in the same folder and
this folder is in the classpath of the EntireX Java RPC Server.
library 'LibStrct' is
struct 'Struct1' is
define data parameter
1 Field01 (A10)
1 Field02 (N2)
1 Field03 (I4)
end-define
program 'Program1' is
define data parameter
1 Ref1 ('Struct1'/3) In Out
1 Ref2 ('Struct1'/1) In
1 Ref3 ('Struct1'/2) Out
end-define
import com.softwareag.entirex.aci.Broker;
import com.softwareag.entirex.aci.BrokerException;
import java.math.BigDecimal;
public class ClientStrct {
public static void main(String[] args) {
try {
Broker broker = new Broker(Libstrct.DEFAULT_BROKERID, "User1");
broker.logon();
// create the wrapper object.
Libstrct lib = new Libstrct(broker, Libstrct.DEFAULT_SERVER);
/* create a struct object (as defined in the wrapper object) for the
* InOut parameter struct1.
*/
Struct1[] struct1 = new Struct1[3];
// /*
// * Using the old style:
// * fill the struct object with data.
// */
// for (int i = 0; i < struct1.length; i++) {
// // create a new array element.
// struct1[i] = new Struct1();
// struct1[i].setField01("struct1 ");
// struct1[i].setField02(new BigDecimal(4 + i));
// struct1[i].setField03(i);
// }
// // set the struct object in the wrapper object
// lib.setRef1 (struct1);
/*
* Fill the struct1 parameters, using the new methods for indexed access.
*/
for (int i = 0; i < struct1.length; i++) {
Struct1 struct = new Struct1();
struct.setField01("struct1 ");
struct.setField02(new BigDecimal(4 + i));
struct.setField03(i);
lib.setRef1(i, struct);
}
/* create a struct object (as defined in the wrapper object) for the
* In parameter struct2.
*/
Struct1[] struct2 = new Struct1[1];
for (int i = 0; i < struct2.length; i++) {
// create a new array element.
struct2[i] = new Struct1();
struct2[i].setField01("struct2 ");
struct2[i].setField02(new BigDecimal(4 + i));
struct2[i].setField03(i);
}
// do the RPC.
lib.program1(struct2);
// /*
// * Using the old style:
// * get the data from the InOut parameter struct1.
// */
// for (int i = 0; i < struct1.length; i++) {
// // get the data from the struct and print.
// System.out.println("Result of Program1, struct1[" + i + "] "
// + struct1[i].getField01() + ", " + struct1[i].getField02() + ", "
// + struct1[i].getField03());
// }
/*
* Retrieve the ref1 elements, using the new indexed access method.
*/
for (int i = 0; i < 3; i++) {
// get the data from the struct and print.
System.out.println("Result of Program1, struct1[" + i + "] "
+ lib.getRef1(i).getField01() + ", "
+ lib.getRef1(i).getField02() + ", "
+ lib.getRef1(i).getField03());
}
// /*
// * Using the old style:
// * get the struct object for the Out parameter struct3.
// */
// Struct1[] struct3 = lib.getRef3();
// // get the data from the Out parameter struct3.
// for (int i = 0; i < struct3.length; i++) {
// // get the data from the struct and print.
// System.out.println("Result of Program1, struct3[" + i + "] "
// + struct3[i].getField01() + ", " + struct3[i].getField02() + ", "
// + struct3[i].getField03());
// }
/*
* Retrieve the ref3 elements, using the new indexed access method.
*/
for (int i = 0; i < 2; i++) {
// get the data from the struct and print.
System.out.println("Result of Program1, struct3[" + i + "] "
+ lib.getRef3(i).getField01() + ", "
+ lib.getRef3(i).getField02() + ", "
+ lib.getRef3(i).getField03());
}
broker.logoff();
} catch (BrokerException excep) {
excep.printStackTrace ();
}
}
}
import com.softwareag.entirex.aci.Broker;
import com.softwareag.entirex.aci.BrokerException;
import java.math.BigDecimal;
public class ClientStrct {
public static void main(String[] args) {
try {
Broker broker = new Broker(Libstrct.DEFAULT_BROKERID, "User1");
broker.logon();
// create the wrapper object.
Libstrct lib = new Libstrct(broker, Libstrct.DEFAULT_SERVER);
/* create a struct object (as defined in the wrapper object) for the
* InOut parameter struct1.
*/
Struct1[] struct1 = new Struct1[3];
// fill the struct object with data.
for (int i = 0; i < struct1.length; i++) {
// create a new array element.
struct1[i] = new Struct1();
struct1[i].setField01("struct1 ");
struct1[i].setField02(new BigDecimal(4 + i));
struct1[i].setField03(i);
}
/* create a struct object (as defined in the wrapper object) for the
* In parameter struct2.
*/
Struct1[] struct2 = new Struct1[1];
for (int i = 0; i < struct2.length; i++) {
// create a new array element.
struct2[i] = new Struct1();
struct2[i].setField01("struct2 ");
struct2[i].setField02(new BigDecimal(4 + i));
struct2[i].setField03(i);
}
// set the struct object in the wrapper object
lib.setRef1 (struct1);
// do the RPC.
lib.program1(struct2);
// get the struct object for the Out parameter struct3.
Struct1[] struct3 = lib.getRef3();
// get the data from the InOut parameter struct1.
for (int i = 0; i < struct1.length; i++) {
// get the data from the struct and print.
System.out.println("Result of Program1, struct1[" + i + "] "
+ struct1[i].getField01() + ", " + struct1[i].getField02() + ", "
+ struct1[i].getField03());
}
// get the data from the Out parameter struct3.
for (int i = 0; i < struct3.length; i++) {
// get the data from the struct and print.
System.out.println("Result of Program1, struct3[" + i + "] "
+ struct3[i].getField01() + ", " + struct3[i].getField02() + ", "
+ struct3[i].getField03());
}
broker.logoff();
} catch (BrokerException excep) {
excep.printStackTrace ();
}
}
}
public void program1 (Struct1[] ref2) {
/*
* Program1Group1 is InOut
* Program1Group2 is In
* Program1Group3 is Out
* Move the values from Program1Group2 to Program1Group1 and move the
* value from Program1Group1 to Program1Group3.
*/
int length = Math.min(program1Ref1.length, program1Ref3.length);
for (int i = 0; i < length; i++) {
if (program1Ref3[i] == null)
program1Ref3[i] = new Struct1();
program1Ref3[i].field01 = program1Ref1[i].field01;
program1Ref3[i].field02 = program1Ref1[i].field02;
program1Ref3[i].field03 = program1Ref1[i].field03;
}
for (int i = length; i < program1Ref3.length; i++) {
if (program1Ref3[i] == null)
program1Ref3[i] = new Struct1();
program1Ref3[i].field01 = "New Text " + i;
program1Ref3[i].field02 = new BigDecimal(10);
program1Ref3[i].field03 = 100 + i;
}
length = Math.min(ref2.length, program1Ref1.length);
for (int i = 0; i < length; i++) {
if (program1Ref1[i] == null)
program1Ref1[i] = new Struct1();
program1Ref1[i].field01 = ref2[i].field01;
program1Ref1[i].field02 = ref2[i].field02;
program1Ref1[i].field03 = ref2[i].field03;
}
for (int i = length; i < program1Ref1.length; i++) {
if (program1Ref1[i] == null)
program1Ref1[i] = new Struct1();
program1Ref1[i].field01 = "New Text " + i;
program1Ref1[i].field02 = new BigDecimal(10);
program1Ref1[i].field03 = 100 + i;
}
}
The IDL syntax allows you to define parameters as IN parameters, OUT
parameters, or IN OUT parameters (which is the default if nothing is
specified). This direction specification is reflected in the generated Java
interface object as follows:
IN parameters are sent from the RPC client to the RPC server. IN
parameters are implemented as parameters of the generated method.
OUT parameters are sent from the RPC server to the RPC client. OUT
parameters are implemented as read-only properties. A
getMethod is generated for each OUT parameter.
INOUT parameters are sent from the RPC client to the RPC server and
then back to the RPC client. INOUT parameters are implemented as properties. A
setMethod and a corresponding getMethod is generated for each INOUT
parameter.
Note that only the direction information of the top-level fields (level 1) is relevant. Group fields always inherit the specification from their parent. A different specification is ignored.
See the attribute-list under Software AG IDL Grammar for the syntax on how
to describe attributes in the IDL file and refer to the direction
attribute.
The aligned attribute is not relevant
for the programming language Java. However, a Java client can send the
aligned attribute to an EntireX RPC server, where
it might be needed.
See the attribute-list under Software AG IDL Grammar for the syntax on how
to describe attributes in the IDL file and refer to the aligned
attribute.
The IDL syntax allows definition of procedures only. It does not have the concept of a function. A function is a procedure which, in addition to the parameters, returns a value. Procedures and functions are transparent between clients and server, i.e. a client using a function can call a server implemented as a procedure and vice versa. In Java a procedure corresponds to a method with result type void, a function returns a value of some type.
It is possible to treat the OUT parameter of a procedure as the return
value of a function. The Java Wrapper generates a method with a
non-void result type when the following conditions are met:
the last parameter of the procedure definition is of type OUT;
this last parameter of the procedure definition has the name
Function_Result. The name Function_Result is not case-sensitive.
Of course, in this case getMethod is not
generated for this OUT parameter.
As an example, see the Java Wrapper example that comes with EntireX.