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package derms.replica2;
import java.io.IOException;
import java.net.InetAddress;
import java.time.Duration;
import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
class CoordinatorServer {
static final Duration timeout = Duration.ofSeconds(5);
private City city;
private Resources resources;
private Servers servers;
private Logger log;
CoordinatorServer(City city, Resources resources, Servers servers) throws IOException {
super();
this.city = city;
this.resources = resources;
this.servers = servers;
this.log = DermsLogger.getLogger(this.getClass());
}
CoordinatorServer() throws IOException {
this(new City(), new Resources(), new Servers());
}
void requestResource(CoordinatorID cid, ResourceID rid, int duration)
throws ServerCommunicationError, NoSuchResourceException,
AlreadyBorrowedException, InvalidDurationException
{
log.info("Request for "+rid+" from "+cid);
InetAddress server = servers.get(new City(rid.city));
if (server == null) {
throw new ServerCommunicationError("requestResource(): no connection to server "+rid.city.toString());
}
RequestResource.Client client = new RequestResource.Client(cid, rid, duration);
RequestResource.Response response;
try {
response = client.sendRequest(server);
} catch (IOException e) {
throw new ServerCommunicationError("requestResource(): "+e.getMessage());
}
switch (response.status) {
case SUCCESS:
log.info("Request "+rid+" from "+cid+" - success");
break;
case NO_SUCH_RESOURCE:
log.warning(response.message);
throw new NoSuchResourceException(response.message);
case ALREADY_BORROWED:
log.warning(response.message);
throw new AlreadyBorrowedException(response.message);
case INVALID_DURATION:
log.warning(response.message);
throw new InvalidDurationException(response.message);
default:
log.warning("Unsuccessful response from server: "+response.message);
throw new ServerCommunicationError("requestResource(): failed to borrow resource: "+response.message);
}
}
Resource[] findResource(CoordinatorID cid, ResourceType rname) throws ServerCommunicationError {
log.info("Find Resource "+rname+" from "+cid);
FindResource.Request request = new FindResource.Request(cid, rname);
Collection<Resource> response = ConcurrentHashMap.newKeySet();
ExecutorService pool = Executors.newFixedThreadPool(servers.size());
try {
for (InetAddress server : servers.all()) {
pool.execute(new FindResource.Client(request, server, response));
}
} catch (IOException e) {
String msg = "Failed to start FindResource Client: "+e.getMessage();
log.severe(msg);
throw new ServerCommunicationError("findResource(): "+msg);
}
log.fine("Started worker threads");
pool.shutdown();
boolean terminated;
try {
terminated = pool.awaitTermination(timeout.toMillis(), TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
String msg = "findResource() interrupted: "+e.getMessage();
log.warning(msg);
throw new ServerCommunicationError("findResource(): "+msg);
}
if (!terminated) {
String msg = "Request timed out: no response after "+timeout.toString();
log.warning(msg);
throw new ServerCommunicationError("findResource(): "+msg);
}
Resource[] arr = new Resource[0];
arr = response.toArray(arr);
log.info("Find resource "+rname+" from "+cid+" - success. Response length: "+arr.length);
return arr;
}
void returnResource(CoordinatorID cid, ResourceID rid)
throws ServerCommunicationError, NoSuchResourceException, NotBorrowedException
{
log.info("Return resource "+rid+" from "+cid);
InetAddress server = servers.get(new City(rid.city));
if (server == null) {
String msg = "no connection to server "+rid.city;
log.warning(msg);
throw new ServerCommunicationError("returnResource(): "+msg);
}
log.fine("server address: "+server);
ReturnResource.Client client = new ReturnResource.Client(cid, rid);
ReturnResource.Response response;
try {
response = client.sendRequest(server);
} catch (IOException e) {
log.warning(e.getMessage());
throw new ServerCommunicationError("returnResource(): "+e.getMessage());
}
switch (response.status) {
case SUCCESS:
log.info(cid+" return "+rid+" - success");
break;
case NO_SUCH_RESOURCE:
log.warning(response.message);
throw new NoSuchResourceException(response.message);
case NOT_BORROWED:
log.warning(response.message);
throw new NotBorrowedException(response.message);
default:
String msg = "Failed to return resource: "+response.message;
log.warning(msg);
throw new ServerCommunicationError("returnResource(): "+msg);
}
}
void swapResource(CoordinatorID cid, ResourceID oldRID, ResourceID newRID) throws ServerCommunicationError, NoSuchResourceException {
log.info(cid+": swap "+oldRID+", "+newRID);
InetAddress server = servers.get(new City(oldRID.city));
if (server == null) {
String msg = "no connection to server "+oldRID.city;
log.warning(msg);
throw new ServerCommunicationError("swapResource(): "+msg);
}
log.fine("server address: "+server);
SwapResource.Client client = new SwapResource.Client(cid, oldRID, newRID);
SwapResource.Response response;
try {
response = client.sendRequest(server);
} catch (IOException e) {
throw new ServerCommunicationError("swapResource(): "+e.getMessage());
}
switch (response.status) {
case SUCCESS:
log.info(cid+": swap "+oldRID+", "+newRID+" - success");
break;
case NO_SUCH_RESOURCE:
throw new NoSuchResourceException(response.message);
default:
throw new ServerCommunicationError("swapResource(): "+response.message);
}
}
}
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