com.ericsson.otp.erlang.Links Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jinterface Show documentation

Jinterface Java package contains java classes, which help you integrate programs written in Java with Erlang. Erlang is a programming language designed at the Ericsson Computer Science Laboratory.

There is a newer version: 1.6.1

Show newest version

/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 2000-2009. All Rights Reserved.
 * 
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * %CopyrightEnd%
 */
package com.ericsson.otp.erlang;

// package scope
class Links {
    Link[] links;
    int count;

    Links() {
	this(10);
    }

    Links(final int initialSize) {
	links = new Link[initialSize];
	count = 0;
    }

    synchronized void addLink(final OtpErlangPid local,
	    final OtpErlangPid remote) {
	if (find(local, remote) == -1) {
	    if (count >= links.length) {
		final Link[] tmp = new Link[count * 2];
		System.arraycopy(links, 0, tmp, 0, count);
		links = tmp;
	    }
	    links[count++] = new Link(local, remote);
	}
    }

    synchronized void removeLink(final OtpErlangPid local,
	    final OtpErlangPid remote) {
	int i;

	if ((i = find(local, remote)) != -1) {
	    count--;
	    links[i] = links[count];
	    links[count] = null;
	}
    }

    synchronized boolean exists(final OtpErlangPid local,
	    final OtpErlangPid remote) {
	return find(local, remote) != -1;
    }

    synchronized int find(final OtpErlangPid local, final OtpErlangPid remote) {
	for (int i = 0; i < count; i++) {
	    if (links[i].equals(local, remote)) {
		return i;
	    }
	}
	return -1;
    }

    int count() {
	return count;
    }

    /* all local pids get notified about broken connection */
    synchronized OtpErlangPid[] localPids() {
	OtpErlangPid[] ret = null;
	if (count != 0) {
	    ret = new OtpErlangPid[count];
	    for (int i = 0; i < count; i++) {
		ret[i] = links[i].local();
	    }
	}
	return ret;
    }

    /* all remote pids get notified about failed pid */
    synchronized OtpErlangPid[] remotePids() {
	OtpErlangPid[] ret = null;
	if (count != 0) {
	    ret = new OtpErlangPid[count];
	    for (int i = 0; i < count; i++) {
		ret[i] = links[i].remote();
	    }
	}
	return ret;
    }

    /* clears the link table, returns a copy */
    synchronized Link[] clearLinks() {
	Link[] ret = null;
	if (count != 0) {
	    ret = new Link[count];
	    for (int i = 0; i < count; i++) {
		ret[i] = links[i];
		links[i] = null;
	    }
	    count = 0;
	}
	return ret;
    }

    /* returns a copy of the link table */
    synchronized Link[] links() {
	Link[] ret = null;
	if (count != 0) {
	    ret = new Link[count];
	    System.arraycopy(links, 0, ret, 0, count);
	}
	return ret;
    }
}