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/*
This file is part of GNUnet.
(C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.peerstore;
import org.gnunet.peerstore.messages.IterateEndMessage;
import org.gnunet.peerstore.messages.IterateRecordMessage;
import org.gnunet.peerstore.messages.StoreMessage;
import org.gnunet.peerstore.messages.WatchRecordMessage;
import org.gnunet.requests.MatchingRequestContainer;
import org.gnunet.requests.RequestIdentifier;
import org.gnunet.requests.SequentialRequestContainer;
import org.gnunet.requests.TimeoutHandler;
import org.gnunet.util.*;
/**
* API for the GNUnet peerstore service.
*/
public class Peerstore {
/**
* Client connecting us to the statistics service.
*/
private Client client;
/**
* All request to the service for iterating records.
*/
private final SequentialRequestContainer<IterateRequest> iterateRequests;
/**
* All requests to the service for watching a value.
*/
private final MatchingRequestContainer<HashCode, WatchRequest> watchRequests;
/**
* Are we currently destroying the client?
*/
private boolean destroyRequested;
/**
* Messages from the statistics service are dispatched to an instance of
* this class.
*/
public class PeerstoreMessageReceiver extends RunaboutMessageReceiver {
public void visit(IterateRecordMessage m) {
RequestIdentifier<IterateRequest> req = iterateRequests
.getRequestIdentifier();
if (null != req)
req.getRequest().receiver.onReceive(m.sub_system, m.peer,
m.key, m.value, new AbsoluteTime(m.expiry.value));
}
public void visit(IterateEndMessage m) {
RequestIdentifier<IterateRequest> req = iterateRequests
.getRequestIdentifier();
if (null != req) {
req.retire();
req.getRequest().receiver.onDone();
}
}
public void visit(WatchRecordMessage m) {
RequestIdentifier<WatchRequest> ri = watchRequests
.getRequestIdentifier(WatchRequest.getHash(m.sub_system,
m.peer, m.key));
WatchRequest r = ri.getRequest();
if (null != r) {
r.watcher.onReceive(m.sub_system, m.peer, m.key, m.value,
new AbsoluteTime(m.expiry.value));
}
}
@Override
public void handleError() {
if (null == client)
throw new AssertionError();
if (!destroyRequested) {
client.reconnect();
iterateRequests.restart();
watchRequests.restart();
}
}
}
/**
* Create a connection to the peerstore service.
*
* @param cfg
* configuration to use
*/
public Peerstore(Configuration cfg) {
client = new Client("peerstore", cfg);
client.installReceiver(new PeerstoreMessageReceiver());
iterateRequests = new SequentialRequestContainer<IterateRequest>(client);
watchRequests = new MatchingRequestContainer<HashCode, WatchRequest>(
client);
}
/**
* Store a new entry in the PEERSTORE. Note that stored entries can be lost
* in some cases such as power failure.
*
* @param sub_system
* name of the sub system
* @param peer
* Peer Identity
* @param key
* entry key
* @param value
* entry value BLOB
* @param expiry
* absolute time after which the entry is (possibly) deleted
* @param options
* options specific to the storage operation
*/
public void store(final String sub_system, final PeerIdentity peer,
final String key, final byte[] value, AbsoluteTime expiry,
StoreOption options) {
if (destroyRequested || client == null)
throw new AssertionError("already destroyed");
StoreMessage sm = new StoreMessage();
sm.peer_set = 1;
sm.peer = peer;
sm.sub_system_size = sub_system.length() + 1;
sm.key_size = key.length() + 1;
sm.value_size = value.length;
sm.expiry = new AbsoluteTimeMessage(expiry);
sm.options = options.val;
sm.sub_system = sub_system;
sm.key = key;
sm.value = value;
client.send(sm);
}
/**
* Iterate over records matching supplied key information
*
* @param sub_system
* name of sub system
* @param peer
* Peer identity (can be NULL)
* @param key
* entry key string (can be NULL)
* @param timeout
* time after which the iterate request is canceled
* @param receiver
* Object that will receive request results
* @return Handle to iteration request
*/
public Cancelable iterate(final String sub_system, final PeerIdentity peer,
final String key, final RelativeTime timeout,
final PeerstoreReceiver receiver) {
if (destroyRequested || client == null)
throw new AssertionError("already destroyed");
RequestIdentifier<IterateRequest> identifier = iterateRequests
.addRequest(new IterateRequest(sub_system, peer, key, receiver));
identifier.setTimeout(timeout, new TimeoutHandler() {
@Override
public void onTimeout() {
receiver.onTimeout();
}
});
return identifier;
}
/**
* Request watching a given key User will be notified with any new values
* added to key
*
* @param sub_system
* name of sub system
* @param peer
* Peer identity
* @param key
* entry key string
* @param watcher
* Receiver for watch records
* @return Handle to watch request
*/
public Cancelable watch(final String sub_system, final PeerIdentity peer,
final String key, PeerstoreWatcher watcher) {
if (destroyRequested || null == client)
throw new AssertionError("already destroyed");
WatchRequest r = new WatchRequest(sub_system, peer, key, watcher);
return watchRequests.addRequest(r.hash, r);
}
/**
* Destroy handle to the peerstore service.
*/
public void destroy() { // TODO: imeplement syncfirst
if (destroyRequested)
throw new AssertionError("already destroyed");
destroyRequested = true;
client.disconnect();
client = null;
}
}
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