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/*
* %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;
}
}
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