Class RMIServerImpl

java.lang.Object
javax.management.remote.rmi.RMIServerImpl
All Implemented Interfaces:
Closeable, AutoCloseable, Remote, RMIServer
Direct Known Subclasses:
RMIIIOPServerImpl, RMIJRMPServerImpl 
public abstract class RMIServerImpl extends Object implements Closeable, RMIServer

An RMI object representing a connector server. Remote clients can make connections using the newClient(Object) method. This method returns an RMI object representing the connection.

User code does not usually reference this class directly. RMI connection servers are usually created with the class RMIConnectorServer. Remote clients usually create connections either with JMXConnectorFactory or by instantiating RMIConnector.

This is an abstract class. Concrete subclasses define the details of the client connection objects.

Since:
1.5

Constructor Summary

Constructor Description
RMIServerImpl(Map<String,?> env)
Constructs a new RMIServerImpl.

Method Summary

Modifier and Type Method Description
protected void clientClosed(RMIConnection client)
Method called when a client connection created by makeClient is closed.
void close()
Closes this connection server.
protected abstract void closeClient(RMIConnection client)
Closes a client connection made by makeClient.
protected abstract void closeServer()
Called by close() to close the connector server.
protected abstract void export()
Exports this RMI object.
ClassLoader getDefaultClassLoader()
Gets the default ClassLoader used by this connector server.
MBeanServer getMBeanServer()
The MBeanServer to which this connector server is attached.
protected abstract String getProtocol()
Returns the protocol string for this object.
String getVersion()
The version of the RMI Connector Protocol understood by this connector server.
protected abstract RMIConnection makeClient(String connectionId, Subject subject)
Creates a new client connection.
RMIConnection newClient(Object credentials)
Creates a new client connection.
void setDefaultClassLoader(ClassLoader cl)
Sets the default ClassLoader for this connector server.
void setMBeanServer(MBeanServer mbs)
Sets the MBeanServer to which this connector server is attached.
abstract Remote toStub()
Returns a remotable stub for this server object.

Methods declared in class java.lang.Object

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

Constructor Details

RMIServerImpl

public RMIServerImpl(Map<String,?> env)

Constructs a new RMIServerImpl.

Parameters:
env - the environment containing attributes for the new RMIServerImpl. Can be null, which is equivalent to an empty Map.

Method Details

export

protected abstract void export() throws IOException

Exports this RMI object.

Throws:
IOException - if this RMI object cannot be exported.

toStub

public abstract Remote toStub() throws IOException
Returns a remotable stub for this server object.
Returns:
a remotable stub.
Throws:
IOException - if the stub cannot be obtained - e.g the RMIServerImpl has not been exported yet.

setDefaultClassLoader

public void setDefaultClassLoader(ClassLoader cl)

Sets the default ClassLoader for this connector server. New client connections will use this classloader. Existing client connections are unaffected.

Parameters:
cl - the new ClassLoader to be used by this connector server.
See Also:

getDefaultClassLoader

public ClassLoader getDefaultClassLoader()

Gets the default ClassLoader used by this connector server.

Returns:
the default ClassLoader used by this connector server.
See Also:

setMBeanServer

public void setMBeanServer(MBeanServer mbs)

Sets the MBeanServer to which this connector server is attached. New client connections will interact with this MBeanServer. Existing client connections are unaffected.

Parameters:
mbs - the new MBeanServer. Can be null, but new client connections will be refused as long as it is.
See Also:

getMBeanServer

public MBeanServer getMBeanServer()

The MBeanServer to which this connector server is attached. This is the last value passed to setMBeanServer(javax.management.MBeanServer) on this object, or null if that method has never been called.

Returns:
the MBeanServer to which this connector is attached.
See Also:

getVersion

public String getVersion()
Description copied from interface: RMIServer

The version of the RMI Connector Protocol understood by this connector server. This is a string with the following format:

 protocol-version implementation-name

The protocol-version is a series of two or more non-negative integers separated by periods (.). An implementation of the version described by this documentation must use the string 1.0 here.

After the protocol version there must be a space, followed by the implementation name. The format of the implementation name is unspecified. It is recommended that it include an implementation version number. An implementation can use an empty string as its implementation name, for example for security reasons.

Specified by:
getVersion in interface RMIServer
Returns:
a string with the format described here.

newClient

public RMIConnection newClient(Object credentials) throws IOException

Creates a new client connection. This method calls makeClient and adds the returned client connection object to an internal list. When this RMIServerImpl is shut down via its close() method, the close() method of each object remaining in the list is called.

The fact that a client connection object is in this internal list does not prevent it from being garbage collected.

Specified by:
newClient in interface RMIServer
Parameters:
credentials - this object specifies the user-defined credentials to be passed in to the server in order to authenticate the caller before creating the RMIConnection. Can be null.
Returns:
the newly-created RMIConnection. This is usually the object created by makeClient, though an implementation may choose to wrap that object in another object implementing RMIConnection.
Throws:
IOException - if the new client object cannot be created or exported.
SecurityException - if the given credentials do not allow the server to authenticate the user successfully.
IllegalStateException - if getMBeanServer() is null.

makeClient

protected abstract RMIConnection makeClient(String connectionId, Subject subject) throws IOException

Creates a new client connection. This method is called by the public method newClient(Object).

Parameters:
connectionId - the ID of the new connection. Every connection opened by this connector server will have a different ID. The behavior is unspecified if this parameter is null.
subject - the authenticated subject. Can be null.
Returns:
the newly-created RMIConnection.
Throws:
IOException - if the new client object cannot be created or exported.

closeClient

protected abstract void closeClient(RMIConnection client) throws IOException

Closes a client connection made by makeClient.

Parameters:
client - a connection previously returned by makeClient on which the closeClient method has not previously been called. The behavior is unspecified if these conditions are violated, including the case where client is null.
Throws:
IOException - if the client connection cannot be closed.

getProtocol

protected abstract String getProtocol()

Returns the protocol string for this object. The string is rmi for RMI/JRMP.

Returns:
the protocol string for this object.

clientClosed

protected void clientClosed(RMIConnection client) throws IOException

Method called when a client connection created by makeClient is closed. A subclass that defines makeClient must arrange for this method to be called when the resultant object's close method is called. This enables it to be removed from the RMIServerImpl's list of connections. It is not an error for client not to be in that list.

After removing client from the list of connections, this method calls closeClient(client).

Parameters:
client - the client connection that has been closed.
Throws:
IOException - if closeClient(javax.management.remote.rmi.RMIConnection) throws this exception.
NullPointerException - if client is null.

close

public void close() throws IOException

Closes this connection server. This method first calls the closeServer() method so that no new client connections will be accepted. Then, for each remaining RMIConnection object returned by makeClient, its close method is called.

The behavior when this method is called more than once is unspecified.

If closeServer() throws an IOException, the individual connections are nevertheless closed, and then the IOException is thrown from this method.

If closeServer() returns normally but one or more of the individual connections throws an IOException, then, after closing all the connections, one of those IOExceptions is thrown from this method. If more than one connection throws an IOException, it is unspecified which one is thrown from this method.

Specified by:
close in interface AutoCloseable
Specified by:
close in interface Closeable
Throws:
IOException - if closeServer() or one of the RMIConnection.close() calls threw IOException.

closeServer

protected abstract void closeServer() throws IOException

Called by close() to close the connector server. After returning from this method, the connector server must not accept any new connections.

Throws:
IOException - if the attempt to close the connector server failed.

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https://docs.oracle.com/en/java/javase/17/docs/api/java.management.rmi/javax/management/remote/rmi/RMIServerImpl.html