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EHandle.java
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/
EHandle.java
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/**
* This file is part of Erjang - A JVM-based Erlang VM
*
* Copyright (c) 2009 by Trifork
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
package erjang;
import kilim.Pausable;
/**
* An EHandle is either an EPort or an EPID. EHandles can be sent messages
*/
public abstract class EHandle extends EObject {
protected EObject name = null;
public EHandle testHandle() { return this; }
ETask<?> task() {
throw new Error("only local handles can provide task reference");
}
public boolean exists() {
return task().exists();
}
/**
* @param msg
* @throws Pausable
*/
public void send(EObject msg) throws Pausable {
task().mbox_send(msg);
}
public void sendb(EObject msg) {
task().mbox().putb(msg);
}
/**
* @param self
* @param result
* @throws Pausable
*/
public void exit_signal(EHandle from, EObject reason) throws Pausable {
task().send_exit(from, reason);
}
/**
* A one-way link message. (other is already linked to this handle).
*
* @param other
* @throws Pausable
*/
public abstract void link_oneway(EHandle other) throws Pausable;
/**
* @param other
* @return
*/
public static EHandle cast(EObject other) {
EHandle h = other.testHandle();
if (h == null) {
h = ERT.whereis(other).testHandle();
}
return h;
}
/**
* @param aname
*/
public void setName(EAtom aname) {
this.name = aname;
}
/**
* @return
*/
public ELocalHandle testLocalHandle() {
return null;
}
}