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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 2017 Amdocs
* * ===========================================================================
* * 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.cadi.dnsloc;
import java.io.IOException;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import com.att.cadi.Access;
import com.att.cadi.Access.Level;
import com.att.cadi.Locator;
import com.att.cadi.LocatorException;
public class DNSLocator implements Locator {
private static enum Status {UNTRIED, OK, INVALID, SLOW};
private static final int CHECK_TIME = 3000;
private String host, protocol;
private Access access;
private Host[] hosts;
private int startPort, endPort;
private String suffix;
public DNSLocator(Access access, String protocol, String host, String range) {
this.host = host;
this.protocol = protocol;
this.access = access;
int dash = range.indexOf('-');
if(dash<0) {
startPort = endPort = Integer.parseInt(range);
} else {
startPort = Integer.parseInt(range.substring(0,dash));
endPort = Integer.parseInt(range.substring(dash + 1));
}
refresh();
}
@Override
public URI get(Item item) throws LocatorException {
return hosts[((DLItem)item).cnt].uri;
}
@Override
public boolean hasItems() {
for(Host h : hosts) {
if(h.status==Status.OK) {
return true;
}
}
return false;
}
@Override
public void invalidate(Item item) {
DLItem di = (DLItem)item;
hosts[di.cnt].status = Status.INVALID;
}
@Override
public Item best() throws LocatorException {
// not a good "best"
for(int i=0;i<hosts.length;++i) {
switch(hosts[i].status) {
case OK:
return new DLItem(i);
case INVALID:
break;
case SLOW:
break;
case UNTRIED:
try {
if(hosts[i].ia.isReachable(CHECK_TIME)) {
hosts[i].status = Status.OK;
return new DLItem(i);
}
} catch (IOException e) {
throw new LocatorException(e);
}
break;
default:
break;
}
}
throw new LocatorException("No Available URIs for " + host);
}
@Override
public Item first() throws LocatorException {
return new DLItem(0);
}
@Override
public Item next(Item item) throws LocatorException {
DLItem di = (DLItem)item;
if(++di.cnt<hosts.length) {
return di;
} else {
return null;
}
}
@Override
public boolean refresh() {
try {
InetAddress[] ias = InetAddress.getAllByName(host);
Host[] temp = new Host[ias.length * (1 + endPort - startPort)];
int cnt = -1;
for(int j=startPort; j<=endPort; ++j) {
for(int i=0;i<ias.length;++i) {
temp[++cnt] = new Host(ias[i], j, suffix);
}
}
hosts = temp;
return true;
} catch (Exception e) {
access.log(Level.ERROR, e);
}
return false;
}
private class Host {
private URI uri;
private InetAddress ia;
private Status status;
public Host(InetAddress inetAddress, int port, String suffix) throws URISyntaxException {
ia = inetAddress;
uri = new URI(protocol,null,inetAddress.getHostAddress(),port,suffix,null,null);
status = Status.UNTRIED;
}
}
private class DLItem implements Item {
public DLItem(int i) {
cnt = i;
}
private int cnt;
}
@Override
public void destroy() {
// TODO Auto-generated method stub
}
}
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