diff options
Diffstat (limited to 'client/src/main/java/org/onap/aaf/cadi/locator/HotPeerLocator.java')
| -rw-r--r-- | client/src/main/java/org/onap/aaf/cadi/locator/HotPeerLocator.java | 304 |
1 files changed, 0 insertions, 304 deletions
diff --git a/client/src/main/java/org/onap/aaf/cadi/locator/HotPeerLocator.java b/client/src/main/java/org/onap/aaf/cadi/locator/HotPeerLocator.java deleted file mode 100644 index 04d2a28..0000000 --- a/client/src/main/java/org/onap/aaf/cadi/locator/HotPeerLocator.java +++ /dev/null @@ -1,304 +0,0 @@ -/*******************************************************************************
- * ============LICENSE_START====================================================
- * * org.onap.aaf
- * * ===========================================================================
- * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
- * * ===========================================================================
- * * 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 org.onap.aaf.cadi.locator;
-
-import org.onap.aaf.cadi.Access;
-import org.onap.aaf.cadi.Locator;
-import org.onap.aaf.cadi.LocatorException;
-import org.onap.aaf.cadi.Access.Level;
-import org.onap.aaf.cadi.routing.GreatCircle;
-
-import org.onap.aaf.inno.env.util.Split;
-
-/**
- * This Locator is to handle Hot Peer load protection, when the Servers are
- * 1) Static
- * 2) Well known client URL
- *
- * The intention is to change traffic over to the Hot Peer, if a server goes down, and reinstate
- * when it is back up.
- *
- * Example of this kind of Service is a MS Certificate Server
- *
- *
- *
- * @param <CLIENT>
- */
-public abstract class HotPeerLocator<CLIENT> implements Locator<CLIENT> {
- private final String[] urlstrs;
- private final CLIENT[] clients;
- private final long[] failures;
- private final double[] distances;
- private int preferred;
- private long invalidateTime;
- private Thread refreshThread;
- protected Access access;
-
- /**
- * Construct: Expect one or more Strings in the form:
- * 192.555.112.223:39/38.88087/-77.30122
- * separated by commas
- *
- * @param trans
- * @param urlstr
- * @param invalidateTime
- * @param localLatitude
- * @param localLongitude
- * @throws LocatorException
- */
- @SuppressWarnings("unchecked")
- protected HotPeerLocator(Access access, final String urlstr, final long invalidateTime, final String localLatitude, final String localLongitude) throws LocatorException {
- this.access = access;
- urlstrs = Split.split(',', urlstr);
- clients = (CLIENT[])new Object[urlstrs.length];
- failures = new long[urlstrs.length];
- distances= new double[urlstrs.length];
- this.invalidateTime = invalidateTime;
-
- double distance = Double.MAX_VALUE;
- for(int i=0;i<urlstrs.length;++i) {
- String[] info = Split.split('/', urlstrs[i]);
- if(info.length<3) {
- throw new LocatorException("Configuration needs LAT and LONG, i.e. ip:port/lat/long");
- }
- try {
- clients[i] = _newClient(urlstrs[i]);
- failures[i] = 0L;
- } catch(LocatorException le) {
- failures[i] = System.currentTimeMillis()+invalidateTime;
- }
-
- double d = GreatCircle.calc(info[1],info[2],localLatitude,localLongitude);
- distances[i]=d;
-
- // find preferred server
- if(d<distance) {
- preferred = i;
- distance=d;
- }
- }
-
- access.printf(Level.INIT,"Preferred Client is %s",urlstrs[preferred]);
- for(int i=0;i<urlstrs.length;++i) {
- if(i!=preferred) {
- access.printf(Level.INIT,"Alternate Client is %s",urlstrs[i]);
- }
- }
- }
-
- protected abstract CLIENT _newClient(String hostInfo) throws LocatorException;
- /**
- * If client can reconnect, then return. Otherwise, destroy and return null;
- * @param client
- * @return
- * @throws LocatorException
- */
- protected abstract CLIENT _invalidate(CLIENT client);
-
- protected abstract void _destroy(CLIENT client);
-
- @Override
- public Item best() throws LocatorException {
- if(failures[preferred]==0L) {
- return new HPItem(preferred);
- } else {
- long now = System.currentTimeMillis();
- double d = Double.MAX_VALUE;
- int best = -1;
- boolean tickle = false;
- // try for best existing client
- for(int i=0;i<urlstrs.length;++i) {
- if(failures[i]<now && distances[i]<d) {
- if(clients[i]!=null) {
- best = i;
- break;
- } else {
- tickle = true; // There's some failed clients which can be restored
- }
- }
- }
- if(best<0 && tickle) {
- tickle=false;
- if(refresh()) {
- // try again
- for(int i=0;i<urlstrs.length;++i) {
- if(failures[i]==0L && distances[i]<d) {
- if(clients[i]!=null) {
- best = i;
- break;
- }
- }
- }
- }
- }
-
- /*
- * If a valid client is available, but there are some that can refresh, return the client immediately
- * but start a Thread to do the background Client setup.
- */
- if(tickle) {
- synchronized(clients) {
- if(refreshThread==null) {
- refreshThread = new Thread(new Runnable(){
- @Override
- public void run() {
- refresh();
- refreshThread = null;
- }
- });
- refreshThread.setDaemon(true);
- refreshThread.start();
- }
- }
- }
-
- if(best<0) {
- throw new LocatorException("No Clients available");
- }
-
-
- return new HPItem(best);
- }
- }
-
-
- @Override
- public CLIENT get(Item item) throws LocatorException {
- HPItem hpi = (HPItem)item;
- CLIENT c = clients[hpi.idx];
- if(c==null) {
- if(failures[hpi.idx]>System.currentTimeMillis()) {
- throw new LocatorException("Client requested is invalid");
- } else {
- synchronized(clients) {
- c = _newClient(urlstrs[hpi.idx]);
- failures[hpi.idx]=0L;
- }
- }
- } else if(failures[hpi.idx]>0){
- throw new LocatorException("Client requested is invalid");
- }
- return c;
- }
-
- public String info(Item item) {
- HPItem hpi = (HPItem)item;
- if(hpi!=null && hpi.idx<urlstrs.length) {
- return urlstrs[hpi.idx];
- } else {
- return "Invalid Item";
- }
- }
-
- @Override
- public boolean hasItems() {
- for(int i=0;i<clients.length;++i) {
- if(clients[i]!=null && failures[i]==0L) {
- return true;
- }
- }
- return false;
- }
-
- @Override
- public synchronized void invalidate(Item item) throws LocatorException {
- HPItem hpi = (HPItem)item;
- failures[hpi.idx] = System.currentTimeMillis() + invalidateTime;
- CLIENT c = clients[hpi.idx];
- clients[hpi.idx] = _invalidate(c);
- }
-
- @Override
- public Item first() throws LocatorException {
- return new HPItem(0);
- }
-
- @Override
- public Item next(Item item) throws LocatorException {
- HPItem hpi = (HPItem)item;
- if(++hpi.idx>=clients.length) {
- return null;
- }
- return hpi;
- }
-
- @Override
- public boolean refresh() {
- boolean force = !hasItems(); // If no Items at all, reset
- boolean rv = true;
- long now = System.currentTimeMillis();
- for(int i=0;i<clients.length;++i) {
- if(failures[i]>0L && (failures[i]<now || force)) { // retry
- try {
- synchronized(clients) {
- if(clients[i]==null) {
- clients[i]=_newClient(urlstrs[i]);
- }
- failures[i]=0L;
- }
- } catch (LocatorException e) {
- failures[i]=now+invalidateTime;
- rv = false;
- }
- }
- }
- return rv;
- }
-
- @Override
- public void destroy() {
- for(int i=0;i<clients.length;++i) {
- if(clients[i]!=null) {
- _destroy(clients[i]);
- clients[i] = null;
- }
- }
- }
-
- private static class HPItem implements Item {
- private int idx;
-
- public HPItem(int i) {
- idx = i;
- }
- }
-
-
- /*
- * Convenience Functions
- */
- public CLIENT bestClient() throws LocatorException {
- return get(best());
- }
-
- public boolean invalidate(CLIENT client) throws LocatorException {
- for(int i=0;i<clients.length;++i) {
- if(clients[i]==client) { // yes, "==" is appropriate here.. Comparing Java Object Reference
- invalidate(new HPItem(i));
- return true;
- }
- }
- return false;
- }
-
- }
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