diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/java.rmi/share/classes/java/rmi/activation/Activator.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.rmi/share/classes/java/rmi/activation/Activator.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.rmi.activation;
+
+import java.rmi.MarshalledObject;
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+import java.rmi.activation.UnknownObjectException;
+
+/**
+ * The Activator
facilitates remote object activation. A
+ * "faulting" remote reference calls the activator's
+ * activate
method to obtain a "live" reference to a
+ * "activatable" remote object. Upon receiving a request for activation,
+ * the activator looks up the activation descriptor for the activation
+ * identifier, id
, determines the group in which the
+ * object should be activated initiates object re-creation via the
+ * group's ActivationInstantiator
(via a call to the
+ * newInstance
method). The activator initiates the
+ * execution of activation groups as necessary. For example, if an
+ * activation group for a specific group identifier is not already
+ * executing, the activator initiates the execution of a VM for the
+ * group.
+ *
+ * The Activator
works closely with
+ * ActivationSystem
, which provides a means for registering
+ * groups and objects within those groups, and ActivationMonitor
,
+ * which receives information about active and inactive objects and inactive
+ * groups.
+ *
+ * The activator is responsible for monitoring and detecting when
+ * activation groups fail so that it can remove stale remote references
+ * to groups and active object's within those groups.
+ *
+ * @author Ann Wollrath
+ * @see ActivationInstantiator
+ * @see ActivationGroupDesc
+ * @see ActivationGroupID
+ * @since 1.2
+ */
+public interface Activator extends Remote {
+ /**
+ * Activate the object associated with the activation identifier,
+ * id
. If the activator knows the object to be active
+ * already, and force
is false , the stub with a
+ * "live" reference is returned immediately to the caller;
+ * otherwise, if the activator does not know that corresponding
+ * the remote object is active, the activator uses the activation
+ * descriptor information (previously registered) to determine the
+ * group (VM) in which the object should be activated. If an
+ * ActivationInstantiator
corresponding to the
+ * object's group descriptor already exists, the activator invokes
+ * the activation group's newInstance
method passing
+ * it the object's id and descriptor.
+ *
+ * If the activation group for the object's group descriptor does
+ * not yet exist, the activator starts an
+ * ActivationInstantiator
executing (by spawning a
+ * child process, for example). When the activator receives the
+ * activation group's call back (via the
+ * ActivationSystem
's activeGroup
+ * method) specifying the activation group's reference, the
+ * activator can then invoke that activation instantiator's
+ * newInstance
method to forward each pending
+ * activation request to the activation group and return the
+ * result (a marshalled remote object reference, a stub) to the
+ * caller.
+ * + * Note that the activator receives a "marshalled" object instead of a + * Remote object so that the activator does not need to load the + * code for that object, or participate in distributed garbage + * collection for that object. If the activator kept a strong + * reference to the remote object, the activator would then + * prevent the object from being garbage collected under the + * normal distributed garbage collection mechanism. + * + * @param id the activation identifier for the object being activated + * @param force if true, the activator contacts the group to obtain + * the remote object's reference; if false, returning the cached value + * is allowed. + * @return the remote object (a stub) in a marshalled form + * @exception ActivationException if object activation fails + * @exception UnknownObjectException if object is unknown (not registered) + * @exception RemoteException if remote call fails + * @since 1.2 + */ + public MarshalledObject extends Remote> activate(ActivationID id, + boolean force) + throws ActivationException, UnknownObjectException, RemoteException; + +}