/*
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* %CopyrightBegin%
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*
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* Copyright Ericsson AB 2000-2009. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* %CopyrightEnd%
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*/
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package com.ericsson.otp.erlang;
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// package scope
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class Links {
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Link[] links;
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int count;
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Links() {
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this(10);
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}
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Links(final int initialSize) {
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links = new Link[initialSize];
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count = 0;
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}
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synchronized void addLink(final OtpErlangPid local,
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final OtpErlangPid remote) {
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if (find(local, remote) == -1) {
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if (count >= links.length) {
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final Link[] tmp = new Link[count * 2];
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System.arraycopy(links, 0, tmp, 0, count);
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links = tmp;
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}
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links[count++] = new Link(local, remote);
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}
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}
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synchronized void removeLink(final OtpErlangPid local,
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final OtpErlangPid remote) {
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int i;
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if ((i = find(local, remote)) != -1) {
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count--;
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links[i] = links[count];
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links[count] = null;
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}
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}
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synchronized boolean exists(final OtpErlangPid local,
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final OtpErlangPid remote) {
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return find(local, remote) != -1;
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}
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synchronized int find(final OtpErlangPid local, final OtpErlangPid remote) {
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for (int i = 0; i < count; i++) {
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if (links[i].equals(local, remote)) {
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return i;
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}
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}
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return -1;
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}
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int count() {
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return count;
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}
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/* all local pids get notified about broken connection */
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synchronized OtpErlangPid[] localPids() {
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OtpErlangPid[] ret = null;
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if (count != 0) {
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ret = new OtpErlangPid[count];
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for (int i = 0; i < count; i++) {
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ret[i] = links[i].local();
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}
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}
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return ret;
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}
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/* all remote pids get notified about failed pid */
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synchronized OtpErlangPid[] remotePids() {
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OtpErlangPid[] ret = null;
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if (count != 0) {
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ret = new OtpErlangPid[count];
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for (int i = 0; i < count; i++) {
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ret[i] = links[i].remote();
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}
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}
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return ret;
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}
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/* clears the link table, returns a copy */
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synchronized Link[] clearLinks() {
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Link[] ret = null;
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if (count != 0) {
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ret = new Link[count];
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for (int i = 0; i < count; i++) {
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ret[i] = links[i];
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links[i] = null;
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}
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count = 0;
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}
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return ret;
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}
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/* returns a copy of the link table */
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synchronized Link[] links() {
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Link[] ret = null;
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if (count != 0) {
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ret = new Link[count];
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System.arraycopy(links, 0, ret, 0, count);
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}
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return ret;
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}
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}
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