このタイプのサーバントマネージャによって活性化されたサーバントは,アクティブオブジェクトマップで管理されます。
サーバントアクティベータを使用したリクエストの処理中には,次のようなイベントが発生します。
そのあとで,サーバントを非活性化できます。これは,deactivate_objectオペレーション,該当するPOAと対応するPOAマネージャの非活性化など,幾つかのソースから行えます。オブジェクトの非活性化の詳細については,「7.4.5 オブジェクトの非活性化」を参照してください。
int main(int argc, char* const* argv) {
try {
// Initialize the ORB.
CORBA::ORB_ptr orb = CORBA::ORB_init(argc, argv);
DataStore::_create();
// get a reference to the rootPOA
CORBA::Object_var obj =
orb->resolve_initial_references("RootPOA");
PortableServer::POA_var rootPOA =
PortableServer::POA::_narrow(obj);
CORBA::PolicyList policies;
policies.length(2);
policies[(CORBA::ULong)0] =
rootPOA->create_lifespan_policy
(PortableServer::PERSISTENT);
policies[(CORBA::ULong)1] =
rootPOA->create_request_processing_policy(
PortableServer::USE_SERVANT_MANAGER);
// Create myPOA with the right policies
PortableServer::POAManager_var rootManager =
rootPOA->the_POAManager();
PortableServer::POA_var myPOA =
rootPOA->create_POA("bank_servant_activator_poa",
rootManager, policies);
// Create a Servant activator
AccountManagerActivator servant_activator_impl;
//Set the servant activator
myPOA->set_servant_manager(&servant_activator_impl);
// Generate two references - one for checking and another
//for savings.Note that we are not creating any
//servants here and just manufacturing a reference which
//is not yet backed by a servant
PortableServer::ObjectId_var an_oid =
PortableServer::string_to_ObjectId
("CheckingAccountManager");
CORBA::Object_var cref = myPOA->create_reference_with_id
(an_oid.in(), IDL:Bank/AccountManager:1.0");
an_oid = PortableServer::string_to_ObjectId
("SavingsAccountManager");
CORBA::Object_var sref = myPOA->create_reference_with_id
(an_oid.in(), "IDL:Bank/AccountManager:1.0");
//Activate the POA Manager
rootManager->activate();
// Write out Checking reference
CORBA::String_var string_ref = orb->object_to_string
(cref.in());
ofstream crefFile("cref.dat");
crefFile << string_ref << endl;
crefFile.close();
// Now write out the Savings reference
string_ref = orb->object_to_string(sref.in());
ofstream srefFile("sref.dat");
srefFile << string_ref << endl;
srefFile.close();
// Waiting for incoming requests
cout << "BankManager Server is ready" << endl;
orb->run();
DataStore::_destroy();
}
catch(const CORBA::Exception& e) {
cerr << e << endl;
}
return 1;
}
import org.omg.PortableServer.*;
public class Server {
public static void main(String[ ] args) {
try {
// Initialize the ORB.
org.omg.CORBA.ORB orb =
org.omg.CORBA.FORB.init(args, null);
// get a reference to the rootPOA
POA rootPOA = POAHelper.narrow(
orb.resolve_initial_references("RootPOA"));
// Create policies for our POA.
// We need persistence life span and
// use servant manager request processing policies
org.omg.CORBA.Policy[ ] policies = {
rootPOA.create_lifespan_policy(
LifespanPolicyValue.PERSISTENT),
rootPOA.create_request_processing_policy(
RequestProcessingPolicyValue.
USE_SERVANT_MANAGER)
};
// Create myPOA with the right policies
POA myPOA = rootPOA.create_POA(
"bank_servant_activator_poa",
rootPOA.the_POAManager(),
policies );
// Create the servant activator servant
// and get its reference
ServantActivator sa =
new AccountManagerActivator()._this(orb);
// Set the servant activator on our POA
myPOA.set_servant_manager(sa);
org.omg.CORBA.Object ref;
// Activate the POA manager
rootPOA.the_POAManager().activate();
// Generate the reference and write it out.
// One for each Checking and Savings
// account types .Note that we are not creating
// any servants here and just manufacturing a
// reference which is not yet backed by a servant.
try {
ref = myPOA.create_reference_with_id(
"CheckingAccountManager".getBytes(),
"IDL:Bank/AccountManager:1.0");
// Write out checking object ID
java.io.PrintWriter pw =
new java.io.PrintWriter(
new java.io.FileWriter("cref.dat"));
pw.println(orb.object_to_string(ref));
pw.close();
ref = myPOA.create_reference_with_id(
"SavingsAccountManager".getBytes(),
"IDL:Bank/AccountManager:1.0");
// Write out savings object ID
pw = new java.io.PrintWriter(
new java.io.FileWriter("sref.dat"));
System.gc();
pw.println(orb.object_to_string(ref));
pw.close();
} catch ( java.io.IOException e ) {
System.out.println(
"Error writing the IOR to file ");
return;
}
System.out.println("Bank Manager is ready.");
// Wait for incoming requests
orb.run();
} catch (Exception e) {
e.printStackTrace();
}
}
}
このサンプルのサーバントマネージャを,次に示します。
// Servant Activator
class AccountManagerActivator :
public PortableServer::ServantActivator {
public:
virtual PortableServer::Servant incarnate
(const PortableServer::ObjectId& oid,
PortableServer::POA_ptr poa) {
CORBA::String_var s =
PortableServer::ObjectId_to_string (oid);
cout << "¥nAccountManagerActivator.incarnate called
with ID = " << s << endl;
PortableServer::Servant servant;
if ( VISPortable::vstricmp( (char *)s,
"SavingsAccountManager" ) == 0 )
//Create CheckingAccountManager Servant
servant = new SavingsAccountManagerImpl;
else if ( VISPortable::vstricmp( (char *)s,
"CheckingAccountManager" ) == 0 )
//Create CheckingAccountManager Servant
servant = new CheckingAccountManagerImpl;
else
throw CORBA::OBJECT_NOT_EXIST();
// Create a deactivator thread
new DeActivatorThread( oid, poa );
// return the servant
return servant;
}
virtual void etherealize (
const PortableServer::ObjectId& oid,
PortableServer::POA_ptr adapter,
PortableServer::Servant servant,
CORBA::Boolean cleanup_in_progress,
CORBA::Boolean remaining_activations) {
// If there are no remaining activations i.e ObjectIds
// associated with the servant delete it.
CORBA::String_var s =
PortableServer::ObjectId_to_string (oid);
cout << "¥nAccountManagerActivator.etherealize called
with ID = " << s << endl;
if (!remaining_activations)
delete servant;
}
};
import org.omg.PortableServer.*;
public class AccountManagerActivator extends
ServantActivatorPOA {
public Servant incarnate (
byte[ ] oid, POA adapter) throws ForwardRequest {
Servant servant;
String accountType = new String(oid);
System.out.println(
"¥nAccountManagerActivator.incarnate
called with ID = " + accountType + "¥n");
// Create Savings or Checking Servant based on
// AccountType
if ( accountType.equalsIgnoreCase(
"SavingsAccountManager"))
servant = (Servant )new SavingsAccountManagerImpl();
else
servant = (Servant)new CheckingAccountManagerImpl();
new DeactivateThread(oid, adapter).start();
return servant;
}
public void etherealize (byte[ ] oid,
POA adapter,
Servant serv,
boolean cleanup_in_progress,
boolean remaining_activations){
System.out.println(
"¥nAccountManagerActivator.
etherealize called with ID = " +
new String(oid) + "¥n");
System.gc();
}
}
class DeactivateThread extends Thread {
byte[ ] _oid;
POA _adapter;
public DeactivateThread(byte[ ] oid, POA adapter) {
_oid = oid;
_adapter = adapter;
}
public void run(){
try {
Thread.currentThread().sleep(15000);
System.out.println(
"¥nDeactivating the object with ID = " +
new String(_oid) + "¥n");
_adapter.deactivate_object(_oid);
}catch (Exception e) {
e.printStackTrace();
}
}
}