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[WIP] Added base for futures, builders, and big refactoring

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ChronosX88 2019-05-05 19:52:26 +04:00
parent d085b9f80d
commit 7d61993a3c
28 changed files with 1272 additions and 133 deletions
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2
settings.gradle
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rootProject.name = 'GunJava' rootProject.name = 'JGUN'

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src/main/java/io/github/chronosx88/GunJava/Client.java
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package io.github.chronosx88.GunJava;
import io.github.chronosx88.GunJava.storageBackends.MemoryBackend;
import io.github.chronosx88.GunJava.storageBackends.StorageBackend;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;
import org.json.JSONObject;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
public class Client extends WebSocketClient {
private Dup dup = new Dup();
private StorageBackend graph = new MemoryBackend();
public Client(InetAddress address, int port) throws URISyntaxException {
super(new URI("ws://" + address.getHostAddress() + ":" + port));
}
@Override
public void onOpen(ServerHandshake handshakeData) {
System.out.println("Connection open. Status: " + handshakeData.getHttpStatus());
Utils.setTimeout(() -> {
JSONObject msg = new JSONObject();
msg
.put("#", dup.track(Dup.random()))
.put("get", new JSONObject()
.put("#", "FDSA")
.put(".", "species"));
this.send(msg.toString());
}, 2000);
Utils.setTimeout(() -> {
JSONObject msg = new JSONObject();
msg.put("#", dup.track(Dup.random()));
msg.put("put", new JSONObject()
.put("ASDF", Utils.newNode("ASDF", new JSONObject()
.put("name", "Mark Nadal")
.put("boss", new JSONObject().put("#", "FDSA"))).toJSONObject())
.put("FDSA", Utils.newNode("FDSA", new JSONObject().put("name", "Fluffy").put("species", "a kitty").put("slave", new JSONObject().put("#", "ASDF"))).toJSONObject()));
this.send(msg.toString());
}, (int) (1000 * Math.random()));
Utils.setTimeout(() -> {
JSONObject msg = new JSONObject();
msg.put("#", dup.track(Dup.random()));
msg.put("put", new JSONObject()
.put("ASDF", Utils.newNode("ASDF", new JSONObject()
.put("name", "Mark")).toJSONObject())
.put("FDSA", Utils.newNode("FDSA", new JSONObject().put("species", "felis silvestris").put("color", "ginger")).toJSONObject()));
this.send(msg.toString());
}, (int) (1000 * Math.random()));
}
@Override
public void onMessage(String message) {
JSONObject msg = new JSONObject(message);
if(dup.check(msg.getString("#"))){ return; }
dup.track(msg.getString("#"));
if(msg.opt("put") != null) {
HAM.mix(new MemoryBackend(msg.getJSONObject("put")), graph);
}
if(msg.opt("get") != null) {
MemoryBackend getResults = Utils.getRequest(msg.getJSONObject("get"), graph);
JSONObject ack = new JSONObject()
.put("#", dup.track(Dup.random()))
.put("@", msg.getString("#"))
.put("put", getResults.toJSONObject());
this.send(ack.toString());
}
System.out.println("---------------");
System.out.println(msg.toString(2));
this.send(message);
}
@Override
public void onClose(int code, String reason, boolean remote) {
System.out.println("Connection closed. Code/reason/remote: " + code + "/" + reason + "/" + remote);
}
@Override
public void onError(Exception ex) {
System.out.println("Terrible fail: ");
ex.printStackTrace();
}
}

12
src/main/java/io/github/chronosx88/GunJava/MainClient.java
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package io.github.chronosx88.GunJava;
import java.net.Inet4Address;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
public class MainClient {
public static void main(String[] args) throws URISyntaxException, UnknownHostException {
Client client = new Client(Inet4Address.getByAddress(new byte[]{127, 0, 0, 1}), 5054);
client.connect();
}
}

14
src/main/java/io/github/chronosx88/GunJava/MainClientServer.java
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package io.github.chronosx88.GunJava;
import java.net.Inet4Address;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
public class MainClientServer {
public static void main(String[] args) throws URISyntaxException, UnknownHostException {
Server server = new Server(21334);
server.start();
Client client = new Client(Inet4Address.getByAddress(new byte[]{127, 0, 0, 1}), 21334);
client.connect();
}
}

8
src/main/java/io/github/chronosx88/GunJava/MainServer.java
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package io.github.chronosx88.GunJava;
public class MainServer {
public static void main(String[] args) {
Server server = new Server(5054);
server.start();
}
}

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src/main/java/io/github/chronosx88/JGUN/Dispatcher.java Normal file
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package io.github.chronosx88.JGUN;
import io.github.chronosx88.JGUN.futures.BaseFuture;
import io.github.chronosx88.JGUN.nodes.Peer;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
import org.json.JSONObject;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Dispatcher {
private final Map<String, BaseFuture<? extends BaseFuture>> pendingFutures = new ConcurrentHashMap<>();
private final StorageBackend graphStorage;
private final Peer peer;
public Dispatcher(StorageBackend graphStorage, Peer peer) {
this.graphStorage = graphStorage;
this.peer = peer;
}
public void addPendingFuture(BaseFuture<? extends BaseFuture> future) {
pendingFutures.put(future.getFutureID(), future);
}
public void handleIncomingMessage(JSONObject message) {
// FIXME
}
private JSONObject handleGet(JSONObject getData) {
return null; // FIXME
}
private JSONObject handlePut(JSONObject putData) {
return null; // FIXME
}
private void handleIncomingAck(JSONObject ack) {
// FIXME
}
public void sendPutRequest(JSONObject data) {
new Thread(() -> {
InMemoryGraph graph = Utils.prepareDataForPut(data);
peer.emit(Utils.formatPutRequest(graph.toJSONObject()).toString());
}).start();
}
public void sendGetRequest(String key) {
new Thread(() -> {
JSONObject jsonGet = Utils.formatGetRequest(key, null);
peer.emit(jsonGet.toString());
}).start();
}
public void sendGetRequest(String key, String field) {
new Thread(() -> {
JSONObject jsonGet = Utils.formatGetRequest(key, field);
peer.emit(jsonGet.toString());
}).start();
}
}

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src/main/java/io/github/chronosx88/JGUN/Dup.java Normal file
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package io.github.chronosx88.JGUN;
import java.util.Map;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
public class Dup {
private static char[] randomSeed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
private static Random random = new Random(System.currentTimeMillis());
private Map<String, Long> s = new ConcurrentHashMap<>();
private DupOpt opt = new DupOpt();
private Thread to = null;
public Dup() {
opt.max = 1000;
opt.age = 1000 * 9;
}
public String track(String id) {
s.put(id, System.currentTimeMillis());
if(to == null) {
Utils.setTimeout(() -> {
for(Map.Entry<String, Long> entry : s.entrySet()) {
if(opt.age > (System.currentTimeMillis() - entry.getValue()))
continue;
s.remove(entry.getKey());
}
to = null;
}, opt.age);
}
return id;
}
public boolean check(String id) {
if(s.containsKey(id)) {
track(id);
return true;
} else {
return false;
}
}
public static String random() {
return UUID.randomUUID().toString();
}
}

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src/main/java/io/github/chronosx88/JGUN/DupOpt.java Normal file
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package io.github.chronosx88.JGUN;
public class DupOpt {
public int max;
public int age;
}

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src/main/java/io/github/chronosx88/JGUN/HAM.java Normal file
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package io.github.chronosx88.JGUN;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
import org.json.JSONObject;
import java.util.Map;
public class HAM {
private static long defer = Long.MAX_VALUE;
static class HAMResult {
public boolean defer = false;
public boolean historical = false;
public boolean converge = false;
public boolean incoming = false;
public boolean current = false;
public boolean state = false;
public String err = null;
}
public static HAMResult ham(long machineState, long incomingState, long currentState, Object incomingValue, Object currentValue) {
HAMResult result = new HAMResult();
if(machineState < incomingState) {
result.defer = true;
return result;
}
if(incomingState < currentState){
result.historical = true;
return result;
}
if(currentState < incomingState) {
result.converge = true;
result.incoming = true;
return result;
}
if(incomingState == currentState) {
if(incomingValue.equals(currentValue)) {
result.state = true;
return result;
}
if((incomingValue.toString().compareTo(currentValue.toString())) < 0) {
result.converge = true;
result.current = true;
return result;
}
if((currentValue.toString().compareTo(incomingValue.toString())) < 0) {
result.converge = true;
result.incoming = true;
return result;
}
}
result.err = "Invalid CRDT Data: "+ incomingValue +" to "+ currentValue +" at "+ incomingState +" to "+ currentState +"!";
return result;
}
public static InMemoryGraph mix(InMemoryGraph change, StorageBackend data) {
long machine = System.currentTimeMillis();
InMemoryGraph diff = null;
for(Map.Entry<String, Node> entry : change.entries()) {
Node node = entry.getValue();
for(String key : node.values.keySet()) {
Object value = node.values.get(key);
if ("_".equals(key)) { continue; }
long state = node.states.getLong(key);
long was = -1;
Object known = null;
if(data == null) {
data = new InMemoryGraph();
}
if(data.hasNode(node.soul)) {
if(data.getNode(node.soul).states.opt(key) != null) {
was = data.getNode(node.soul).states.getLong(key);
}
known = data.getNode(node.soul).values.opt(key) == null ? 0 : data.getNode(node.soul).values.opt(key);
}
HAMResult ham = ham(machine, state, was, value, known);
if(!ham.incoming) {
if(ham.defer) {
System.out.println("DEFER: " + key + " " + value);
// Hack for accessing value in lambda without making the variable final
StorageBackend[] graph = new StorageBackend[] {data};
Utils.setTimeout(() -> mix(node, graph[0]), (int) (state - System.currentTimeMillis()));
}
continue;
}
if(diff == null) {
diff = new InMemoryGraph();
}
if(!diff.hasNode(node.soul)) {
diff.addNode(node.soul, Utils.newNode(node.soul, new JSONObject()));
}
if(!data.hasNode(node.soul)) {
data.addNode(node.soul, Utils.newNode(node.soul, new JSONObject()));
}
data.getNode(node.soul).values.put(key, value);
diff.getNode(node.soul).values.put(key, value);
diff.getNode(node.soul).states.put(key, state);
data.getNode(node.soul).states.put(key, state);
}
}
return diff;
}
public static InMemoryGraph mix(Node incomingNode, StorageBackend data) {
long machine = System.currentTimeMillis();
InMemoryGraph diff = null;
for(String key : incomingNode.values.keySet()) {
Object value = incomingNode.values.get(key);
if ("_".equals(key)) { continue; }
long state = incomingNode.states.getLong(key);
long was = -1;
Object known = null;
if(data == null) {
data = new InMemoryGraph();
}
if(data.hasNode(incomingNode.soul)) {
if(data.getNode(incomingNode.soul).states.opt(key) != null) {
was = data.getNode(incomingNode.soul).states.getLong(key);
}
known = data.getNode(incomingNode.soul).values.opt(key) == null ? 0 : data.getNode(incomingNode.soul).values.opt(key);
}
HAMResult ham = ham(machine, state, was, value, known);
if(!ham.incoming) {
if(ham.defer) {
System.out.println("DEFER: " + key + " " + value);
// Hack for accessing value in lambda without making the variable final
StorageBackend[] graph = new StorageBackend[] {data};
Utils.setTimeout(() -> mix(incomingNode, graph[0]), (int) (state - System.currentTimeMillis()));
}
continue;
}
if(diff == null) {
diff = new InMemoryGraph();
}
if(!diff.hasNode(incomingNode.soul)) {
diff.addNode(incomingNode.soul, Utils.newNode(incomingNode.soul, new JSONObject()));
}
if(!data.hasNode(incomingNode.soul)) {
data.addNode(incomingNode.soul, Utils.newNode(incomingNode.soul, new JSONObject()));
}
data.getNode(incomingNode.soul).values.put(key, value);
diff.getNode(incomingNode.soul).values.put(key, value);
diff.getNode(incomingNode.soul).states.put(key, state);
data.getNode(incomingNode.soul).states.put(key, state);
}
return diff;
}
}

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src/main/java/io/github/chronosx88/JGUN/Node.java Normal file
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package io.github.chronosx88.JGUN;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import org.json.JSONObject;
public class Node implements Comparable<Node> {
public JSONObject values; // Data
public JSONObject states; // Metadata for diff
public String soul; // i.e. ID of node
/**
* Create a Peer from a JSON object.
*
* @param rawData JSON object, which contains the data
*/
public Node(JSONObject rawData) {
this.values = new JSONObject(rawData.toString());
this.states = values.getJSONObject("_").getJSONObject(">");
this.soul = values.getJSONObject("_").getString("#");
values.remove("_");
}
@Override
public int compareTo(Node other) {
return soul.compareTo(other.soul);
}
@Override
public boolean equals(Object other) {
if (other == null)
return false;
if (other instanceof String)
return soul.equals(other);
if (other instanceof Node)
return compareTo((Node) other) == 0;
return false;
}
@Override
public int hashCode() {
return soul.hashCode();
}
public boolean isNode(String key) {
return values.optJSONObject(key) != null;
}
public Node getNode(String key, InMemoryGraph g) {
String soulRef = values.getJSONObject(key).getString("#");
return g.getNode(soulRef);
}
@Override
public String toString() {
JSONObject jsonObject = new JSONObject(values.toString());
jsonObject.put("_", new JSONObject().put("#", soul).put(">", states));
return jsonObject.toString();
}
public JSONObject toJSONObject() {
JSONObject jsonObject = new JSONObject(values.toString());
jsonObject.put("_", new JSONObject().put("#", soul).put(">", states));
return jsonObject;
}
public JSONObject getMetadata() {
JSONObject jsonObject = new JSONObject();
jsonObject.put("_", new JSONObject().put("#", soul).put(">", states));
return jsonObject;
}
public void setMetadata(JSONObject metadata) {
soul = metadata.getJSONObject("_").getString("#");
states = metadata.getJSONObject("_").getJSONObject(">");
}
}

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src/main/java/io/github/chronosx88/JGUN/PathRef.java Normal file
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package io.github.chronosx88.JGUN;
import io.github.chronosx88.JGUN.futures.builders.GetBuilder;
import io.github.chronosx88.JGUN.futures.builders.PutBuilder;
import org.json.JSONObject;
import java.util.ArrayList;
public class PathRef {
private final ArrayList<String> path = new ArrayList<>();
private Dispatcher dispatcher;
public PathRef(Dispatcher dispatcher) {
this.dispatcher = dispatcher;
}
public PathRef get(String key) {
path.add(key);
return this;
}
public GetBuilder getData() {
return new GetBuilder(path);
}
public PutBuilder put(JSONObject data) {
return new PutBuilder(dispatcher, data, path);
}
}

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src/main/java/io/github/chronosx88/JGUN/Utils.java Normal file
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package io.github.chronosx88.JGUN;
import io.github.chronosx88.JGUN.futures.builders.PutBuilder;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
import org.json.JSONObject;
public class Utils {
public static Thread setTimeout(Runnable runnable, int delay){
Thread thread = new Thread(() -> {
try {
Thread.sleep(delay);
runnable.run();
}
catch (Exception e){
e.printStackTrace();
}
});
thread.start();
return thread;
}
public static Node newNode(String soul, JSONObject data) {
JSONObject states = new JSONObject();
for (String key : data.keySet()) {
states.put(key, System.currentTimeMillis());
}
data.put("_", new JSONObject().put("#", soul).put(">", states));
return new Node(data);
}
public static InMemoryGraph getRequest(JSONObject lex, StorageBackend graph) {
String soul = lex.getString("#");
String key = lex.optString(".", null);
Node node = graph.getNode(soul);
Object tmp;
if(node == null) {
return new InMemoryGraph();
}
if(key != null) {
tmp = node.values.opt(key);
if(tmp == null) {
return new InMemoryGraph();
}
Node node1 = new Node(node.toJSONObject());
node = Utils.newNode(node.soul, new JSONObject());
node.setMetadata(node1.getMetadata());
node.values.put(key, tmp);
JSONObject tmpStates = node1.states;
node.states.put(key, tmpStates.get(key));
}
InMemoryGraph ack = new InMemoryGraph();
ack.addNode(soul, node);
return ack;
}
public static InMemoryGraph prepareDataForPut(JSONObject data) {
InMemoryGraph result = new InMemoryGraph();
for (String objectKey : data.keySet()) {
JSONObject object = data.getJSONObject(objectKey);
Node node = Utils.newNode(objectKey, object);
prepareNodeForPut(node, result);
}
return result;
}
private static void prepareNodeForPut(Node node, InMemoryGraph result) {
for (String key : node.values.keySet()) {
Object value = node.values.get(key);
if(value instanceof JSONObject) {
String soul = Dup.random();
Node tmpNode = Utils.newNode(soul, (JSONObject) value);
node.values.remove(key);
node.values.put(key, new JSONObject().put("#", soul));
prepareNodeForPut(tmpNode, result);
result.addNode(soul, tmpNode);
}
}
result.addNode(node.soul, node);
}
public static JSONObject formatGetRequest(String key, String field) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("#", Dup.random());
JSONObject getParameters = new JSONObject();
getParameters.put("#", key);
if(field != null) {
getParameters.put(".", field);
}
jsonObject.put("get", getParameters);
return jsonObject;
}
public static JSONObject formatPutRequest(JSONObject data) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("#", Dup.random());
jsonObject.put("put", data);
return jsonObject;
}
}

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src/main/java/io/github/chronosx88/JGUN/entrypoints/MainClient.java Normal file
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package io.github.chronosx88.JGUN.entrypoints;
import io.github.chronosx88.JGUN.nodes.GunPeer;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import java.net.Inet4Address;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
public class MainClient {
public static void main(String[] args) throws URISyntaxException, UnknownHostException {
GunPeer gunClient = new GunPeer(Inet4Address.getByAddress(new byte[]{127, 0, 0, 1}), 5054, new InMemoryGraph());
gunClient.connect();
}
}

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src/main/java/io/github/chronosx88/JGUN/entrypoints/MainClientServer.java Normal file
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package io.github.chronosx88.JGUN.entrypoints;
import io.github.chronosx88.JGUN.nodes.GunPeer;
import io.github.chronosx88.JGUN.nodes.GunSuperPeer;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import java.net.Inet4Address;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
public class MainClientServer {
public static void main(String[] args) throws URISyntaxException, UnknownHostException {
GunSuperPeer gunSuperNode = new GunSuperPeer(21334);
gunSuperNode.start();
GunPeer gunClient = new GunPeer(Inet4Address.getByAddress(new byte[]{127, 0, 0, 1}), 21334, new InMemoryGraph());
gunClient.connect();
}
}

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src/main/java/io/github/chronosx88/JGUN/entrypoints/MainServer.java Normal file
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package io.github.chronosx88.JGUN.entrypoints;
import io.github.chronosx88.JGUN.nodes.GunSuperPeer;
public class MainServer {
public static void main(String[] args) {
GunSuperPeer gunSuperNode = new GunSuperPeer(5054);
gunSuperNode.start();
}
}

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src/main/java/io/github/chronosx88/JGUN/futures/BaseFuture.java Normal file
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/*
* Copyright 2019 Thomas Bocek
*
* 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.
*/
package io.github.chronosx88.JGUN.futures;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
/**
* The base for all BaseFuture implementations. Be aware of possible deadlocks. Never await from a listener. This class
* is heavily inspired by MINA and Netty.
*
* @param <K>
* The class that extends BaseFuture and is used to return back the type for method calls.
* @author Thomas Bocek
*/
public abstract class BaseFuture<K extends BaseFuture> {
private static final Logger LOG = LoggerFactory.getLogger(BaseFuture.class);
public enum FutureType {
INIT, OK, FAILED, CANCEL
}
// Listeners that gets notified if the future finished
private final List<BaseFutureListener<? extends BaseFuture>> listeners = new ArrayList<>(1);
// While a future is running, the process may add cancellations for faster
// cancel operations, e.g. cancel connection attempt
private volatile Cancelable cancel = null;
private final CountDownLatch listenersFinished = new CountDownLatch(1);
protected final Object lock;
// set the ready flag if operation completed
protected boolean completed = false;
// by default false, change in case of success. An unfinished operation is
// always set to failed
protected FutureType type = FutureType.INIT;
protected String reason = "unknown";
private K self;
private String futureID;
/**
* Default constructor that sets the lock object, which is used for synchronization to this instance.
*/
public BaseFuture(String futureID) {
this.lock = this;
this.futureID = futureID;
}
/**
* @param self2
* Set the type so that we are able to return it to the user. This is for making the API much more
* usable.
*/
protected void self(final K self2) {
this.self = self2;
}
/**
* @return The object that stored this object. This is necessary for the builder pattern when using generics.
*/
protected K self() {
return self;
}
public K await() throws InterruptedException {
synchronized (lock) {
while (!completed) {
lock.wait();
}
}
return self;
}
public K awaitUninterruptibly() {
synchronized (lock) {
while (!completed) {
try {
lock.wait();
} catch (final InterruptedException e) {
LOG.debug("interrupted, but ignoring", e);
}
}
}
return self;
}
public boolean await(final long timeoutMillis) throws InterruptedException {
return await0(timeoutMillis, true);
}
public boolean awaitUninterruptibly(final long timeoutMillis) {
try {
return await0(timeoutMillis, false);
} catch (final InterruptedException e) {
throw new RuntimeException("This should never ever happen.");
}
}
/**
* Internal await operation that also checks for potential deadlocks.
*
* @param timeoutMillis
* The time to wait
* @param interrupt
* Flag to indicate if the method can throw an InterruptedException
* @return True if this future has finished in timeoutMillis time, false otherwise
* @throws InterruptedException
* If the flag interrupt is true and this thread has been interrupted.
*/
private boolean await0(final long timeoutMillis, final boolean interrupt) throws InterruptedException {
final long startTime = (timeoutMillis <= 0) ? 0 : System.currentTimeMillis();
long waitTime = timeoutMillis;
synchronized (lock) {
if (completed) {
return completed;
} else if (waitTime <= 0) {
return completed;
}
while (true) {
try {
lock.wait(waitTime);
} catch (final InterruptedException e) {
if (interrupt) {
throw e;
}
}
if (completed) {
return true;
} else {
waitTime = timeoutMillis - (System.currentTimeMillis() - startTime);
if (waitTime <= 0) {
return completed;
}
}
}
}
}
public boolean isCompleted() {
synchronized (lock) {
return completed;
}
}
public boolean isSuccess() {
synchronized (lock) {
return completed && (type == FutureType.OK);
}
}
public boolean isFailed() {
synchronized (lock) {
// failed means failed or canceled
return completed && (type != FutureType.OK);
}
}
public boolean isCanceled() {
synchronized (lock) {
return completed && (type == FutureType.CANCEL);
}
}
public K failed(final BaseFuture origin) {
return failed(origin.failedReason());
}
public K failed(final String failed, final BaseFuture origin) {
StringBuilder sb = new StringBuilder(failed);
return failed(sb.append(" <-> ").append(origin.failedReason()).toString());
}
public K failed(final Throwable t) {
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter);
t.printStackTrace(printWriter);
return failed(stringWriter.toString());
}
public K failed(final String failed, final Throwable t) {
if (t == null) {
return failed("n/a");
}
StringBuilder sb = new StringBuilder(failed);
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter);
t.printStackTrace(printWriter);
return failed(sb.append(" <-> ").append(stringWriter.toString()).toString());
}
public K failed(final String failed) {
synchronized (lock) {
if (!completedAndNotify()) {
return self;
}
this.reason = failed;
this.type = FutureType.FAILED;
}
notifyListeners();
return self;
}
public String failedReason() {
final StringBuffer sb = new StringBuffer("Future (compl/canc):");
synchronized (lock) {
sb.append(completed).append("/")
.append(", ").append(type.name())
.append(", ").append(reason);
return sb.toString();
}
}
public FutureType type() {
synchronized (lock) {
return type;
}
}
/**
* Make sure that the calling method has synchronized (lock).
*
* @return True if notified. It will notify if completed is not set yet.
*/
protected boolean completedAndNotify() {
if (!completed) {
completed = true;
lock.notifyAll();
return true;
} else {
return false;
}
}
public K awaitListeners() throws InterruptedException {
boolean wait = false;
synchronized (lock) {
while (!completed) {
lock.wait();
}
if(listeners.size() > 0) {
wait = true;
}
}
if(wait) {
listenersFinished.await();
}
return self;
}
public K awaitListenersUninterruptibly() {
boolean wait = false;
synchronized (lock) {
while (!completed) {
try {
lock.wait();
} catch (final InterruptedException e) {
LOG.debug("interrupted, but ignoring", e);
}
}
if(listeners.size() > 0) {
wait = true;
}
}
while(wait) {
try {
listenersFinished.await();
wait = false;
} catch (InterruptedException e) {
LOG.debug("interrupted, but ignoring", e);
}
}
return self;
}
public K addListener(final BaseFutureListener<? extends BaseFuture> listener) {
boolean notifyNow = false;
synchronized (lock) {
if (completed) {
notifyNow = true;
} else {
listeners.add(listener);
}
}
// called only once
if (notifyNow) {
callOperationComplete(listener);
}
return self;
}
/**
* Call operation complete or call fail listener. If the fail listener fails, its printed as a stack trace.
*
* @param listener
* The listener to call
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
private void callOperationComplete(final BaseFutureListener listener) {
try {
listener.onComplete(this);
} catch (final Exception e) {
try {
listener.onError(this, e);
} catch (final Exception e1) {
LOG.error("Unexpected exception in exceptionCaught()", e1);
}
}
}
/**
* Always call this from outside synchronized(lock)!
*/
protected void notifyListeners() {
// if this is synchronized, it will deadlock, so do not lock this!
// There won't be any visibility problem or concurrent modification
// because 'ready' flag will be checked against both addListener and
// removeListener calls.
//
// This method doesn't need synchronization because:
// 1) This method is always called after synchronized (this) block.
// Hence any listener list modification happens-before this method.
// 2) This method is called only when 'done' is true. Once 'done'
// becomes true, the listener list is never modified - see add/removeListener()
for (final BaseFutureListener<? extends BaseFuture> listener : listeners) {
callOperationComplete(listener);
}
listeners.clear();
listenersFinished.countDown();
// all events are one time events. It cannot happen that you get
// notified twice
}
public K removeListener(final BaseFutureListener<? extends BaseFuture> listener) {
synchronized (lock) {
if (!completed) {
listeners.remove(listener);
}
}
return self;
}
public K setCancel(final Cancelable cancel) {
synchronized (lock) {
if (!completed) {
this.cancel = cancel;
}
}
return self;
}
public void cancel() {
synchronized (lock) {
if (!completedAndNotify()) {
return;
}
this.type = FutureType.CANCEL;
}
if(cancel != null) {
cancel.cancel();
}
notifyListeners();
}
public String getFutureID() {
return futureID;
}
}

6
src/main/java/io/github/chronosx88/JGUN/futures/BaseFutureListener.java Normal file
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@ -0,0 +1,6 @@
package io.github.chronosx88.JGUN.futures;
public interface BaseFutureListener<F extends BaseFuture> {
void onComplete(F future);
void onError(F future, Throwable exception);
}

29
src/main/java/io/github/chronosx88/JGUN/futures/Cancelable.java Normal file
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@ -0,0 +1,29 @@
/*
* Copyright 2009 Thomas Bocek
*
* 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.
*/
package io.github.chronosx88.JGUN.futures;
/**
* A cancelable class should implement this interface and use it for future
* objects.
*
* @author Thomas Bocek
*/
public interface Cancelable {
/**
* Gets called if a future is cancelled.
*/
void cancel();
}

47
src/main/java/io/github/chronosx88/JGUN/futures/FutureGet.java Normal file
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@ -0,0 +1,47 @@
package io.github.chronosx88.JGUN.futures;
import org.json.JSONObject;
public class FutureGet extends BaseFuture<FutureGet> {
private JSONObject data;
private GetStatus getStatus;
enum GetStatus {
OK, NOT_FOUND
}
public FutureGet(String id) {
super(id);
self(this);
}
public JSONObject getData() {
return data;
}
@Override
public boolean isSuccess() {
synchronized (lock) {
return completed && (getStatus == GetStatus.OK) && (type == FutureType.OK);
}
}
public FutureGet done(JSONObject data) {
synchronized (lock) {
if(!data.isEmpty()) {
this.getStatus = GetStatus.OK;
this.type = FutureType.OK;
} else {
this.getStatus = GetStatus.NOT_FOUND;
this.type = FutureType.FAILED;
this.reason = "Not found";
}
this.data = data;
if (!completedAndNotify()) {
return this;
}
}
notifyListeners();
return this;
}
}

24
src/main/java/io/github/chronosx88/JGUN/futures/FuturePut.java Normal file
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@ -0,0 +1,24 @@
package io.github.chronosx88.JGUN.futures;
public class FuturePut extends BaseFuture<FuturePut> {
public FuturePut(String id) {
super(id);
self(this);
}
public FuturePut done(boolean success) {
synchronized (lock) {
if(success) {
this.type = FutureType.OK;
} else {
this.type = FutureType.FAILED;
}
if (!completedAndNotify()) {
return this;
}
}
notifyListeners();
return this;
}
}

11
src/main/java/io/github/chronosx88/JGUN/futures/builders/GetBuilder.java Normal file
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@ -0,0 +1,11 @@
package io.github.chronosx88.JGUN.futures.builders;
import java.util.ArrayList;
public class GetBuilder {
private final ArrayList<String> path;
public GetBuilder(ArrayList<String> path) {
this.path = path;
}
}

43
src/main/java/io/github/chronosx88/JGUN/futures/builders/PutBuilder.java Normal file
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@ -0,0 +1,43 @@
package io.github.chronosx88.JGUN.futures.builders;
import io.github.chronosx88.JGUN.Dispatcher;
import io.github.chronosx88.JGUN.Dup;
import io.github.chronosx88.JGUN.futures.FuturePut;
import org.json.JSONObject;
import java.util.ArrayList;
public class PutBuilder {
private JSONObject data;
private ArrayList<String> path;
private Dispatcher dispatcher;
public PutBuilder(Dispatcher dispatcher, JSONObject data, ArrayList<String> path) {
this.dispatcher = dispatcher;
this.data = data;
this.path = path;
}
public JSONObject getData() {
return data;
}
public ArrayList<String> getPath() {
return path;
}
public void setData(JSONObject data) {
this.data = data;
}
public void setPath(ArrayList<String> path) {
this.path = path;
}
public FuturePut build() {
FuturePut futurePut = new FuturePut(Dup.random());
dispatcher.addPendingFuture(futurePut);
dispatcher.sendPutRequest(data);
return futurePut;
}
}

4
src/main/java/io/github/chronosx88/JGUN/nodes/GunNodeBuilder.java Normal file
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@ -0,0 +1,4 @@
package io.github.chronosx88.JGUN.nodes;
public class GunNodeBuilder {
}

72
src/main/java/io/github/chronosx88/JGUN/nodes/GunPeer.java Normal file
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@ -0,0 +1,72 @@
package io.github.chronosx88.JGUN.nodes;
import io.github.chronosx88.JGUN.*;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;
import org.json.JSONObject;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
public class GunPeer extends WebSocketClient implements Peer {
private Dup dup = new Dup();
private final StorageBackend storage;
private final Dispatcher dispatcher;
public GunPeer(InetAddress address, int port, StorageBackend storage) throws URISyntaxException {
super(new URI("ws://" + address.getHostAddress() + ":" + port));
this.storage = storage;
this.dispatcher = new Dispatcher(storage, this);
}
@Override
public void onOpen(ServerHandshake handshakeData) {
System.out.println("# Connection with SuperNode open. Status: " + handshakeData.getHttpStatus());
}
@Override
public void onMessage(String message) {
JSONObject msg = new JSONObject(message);
if(dup.check(msg.getString("#"))){ return; }
dup.track(msg.getString("#"));
if(msg.opt("put") != null) {
HAM.mix(new InMemoryGraph(msg.getJSONObject("put")), storage);
}
if(msg.opt("get") != null) {
InMemoryGraph getResults = Utils.getRequest(msg.getJSONObject("get"), storage);
JSONObject ack = new JSONObject()
.put("#", dup.track(Dup.random()))
.put("@", msg.getString("#"))
.put("put", getResults.toJSONObject());
emit(ack.toString());
}
System.out.println("---------------");
System.out.println(msg.toString(2));
emit(message);
}
@Override
public void onClose(int code, String reason, boolean remote) {
System.out.println("Connection closed. Code/reason/remote: " + code + "/" + reason + "/" + remote);
}
@Override
public void onError(Exception ex) {
System.out.println("Terrible fail: ");
ex.printStackTrace();
}
@Override
public void emit(String data) {
this.send(data);
}
public PathRef get(String key) {
PathRef pathRef = new PathRef(dispatcher);
pathRef.get(key);
return pathRef;
}
}

32
src/main/java/io/github/chronosx88/GunJava/Server.java → src/main/java/io/github/chronosx88/JGUN/nodes/GunSuperPeer.java
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@ -1,20 +1,21 @@
package io.github.chronosx88.GunJava; package io.github.chronosx88.JGUN.nodes;
import io.github.chronosx88.GunJava.storageBackends.MemoryBackend; import io.github.chronosx88.JGUN.Dup;
import io.github.chronosx88.JGUN.HAM;
import io.github.chronosx88.JGUN.Utils;
import io.github.chronosx88.JGUN.storageBackends.InMemoryGraph;
import org.java_websocket.WebSocket; import org.java_websocket.WebSocket;
import org.java_websocket.handshake.ClientHandshake; import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer; import org.java_websocket.server.WebSocketServer;
import org.json.JSONObject; import org.json.JSONObject;
import java.net.InetSocketAddress; import java.net.InetSocketAddress;
import java.util.Timer;
public class Server extends WebSocketServer { public class GunSuperPeer extends WebSocketServer implements Peer {
private Timer timer = new Timer(true);
private Dup dup = new Dup(); private Dup dup = new Dup();
private MemoryBackend graph = new MemoryBackend(); private InMemoryGraph graph = new InMemoryGraph();
public Server(int port) { public GunSuperPeer(int port) {
super(new InetSocketAddress(port)); super(new InetSocketAddress(port));
setReuseAddr(true); setReuseAddr(true);
} }
@ -35,17 +36,23 @@ public class Server extends WebSocketServer {
if(dup.check(msg.getString("#"))) { return; } if(dup.check(msg.getString("#"))) { return; }
dup.track(msg.getString("#")); dup.track(msg.getString("#"));
if(msg.opt("put") != null) { if(msg.opt("put") != null) {
HAM.mix(new MemoryBackend(msg.getJSONObject("put")), graph); HAM.mix(new InMemoryGraph(msg.getJSONObject("put")), graph);
} }
if(msg.opt("get") != null) { if(msg.opt("get") != null) {
MemoryBackend result = Utils.getRequest(msg.optJSONObject("get"), graph); InMemoryGraph result = Utils.getRequest(msg.optJSONObject("get"), graph);
if(!result.isEmpty()) {
JSONObject ack = new JSONObject(); JSONObject ack = new JSONObject();
if(!result.isEmpty()) {
emit(ack emit(ack
.put("#", dup.track(Dup.random())) .put("#", dup.track(Dup.random()))
.put("@", msg.getString("#")) .put("@", msg.getString("#"))
.put("put", result.toJSONObject()) .put("put", result.toJSONObject())
.toString()); .toString());
} else {
emit(ack
.put("#", dup.track(Dup.random()))
.put("@", msg.getString("#"))
.put("ok", false)
.toString());
} }
} }
emit(message); emit(message);
@ -53,12 +60,13 @@ public class Server extends WebSocketServer {
@Override @Override
public void onError(WebSocket conn, Exception ex) { public void onError(WebSocket conn, Exception ex) {
// System.out.println("# Exception occured on connection: " + conn.getRemoteSocketAddress());
ex.printStackTrace();
} }
@Override @Override
public void onStart() { public void onStart() {
System.out.println("Server started on port: " + getPort()); System.out.println("GunSuperPeer started on port: " + getPort());
} }
public void emit(String data) { public void emit(String data) {

5
src/main/java/io/github/chronosx88/JGUN/nodes/Peer.java Normal file
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@ -0,0 +1,5 @@
package io.github.chronosx88.JGUN.nodes;
public interface Peer {
void emit(String data);
}

69
src/main/java/io/github/chronosx88/JGUN/storageBackends/InMemoryGraph.java Normal file
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@ -0,0 +1,69 @@
package io.github.chronosx88.JGUN.storageBackends;
import io.github.chronosx88.JGUN.Node;
import org.json.JSONObject;
import java.util.*;
public class InMemoryGraph implements StorageBackend {
private final HashMap<String, Node> nodes;
public InMemoryGraph(JSONObject source) {
nodes = new LinkedHashMap<>();
for (String soul : source.keySet())
nodes.put(soul, new Node(source.getJSONObject(soul)));
}
public InMemoryGraph() {
nodes = new LinkedHashMap<>();
}
public Node getNode(String soul) {
return nodes.getOrDefault(soul, null);
}
public void addNode(String soul, Node incomingNode) {
nodes.put(soul, incomingNode);
}
public boolean hasNode(String soul) {
return nodes.containsKey(soul);
}
public Set<Map.Entry<String, Node>> entries() {
return nodes.entrySet();
}
public Collection<Node> nodes() { return nodes.values(); }
@Override
public String toString() {
JSONObject jsonObject = new JSONObject();
for(Map.Entry<String, Node> entry : nodes.entrySet()) {
jsonObject.put(entry.getKey(), entry.getValue().toJSONObject());
}
return jsonObject.toString();
}
public String toPrettyString() {
JSONObject jsonObject = new JSONObject();
for(Map.Entry<String, Node> entry : nodes.entrySet()) {
jsonObject.put(entry.getKey(), entry.getValue().toJSONObject());
}
return jsonObject.toString(2);
}
public JSONObject toJSONObject() {
JSONObject jsonObject = new JSONObject();
for(Map.Entry<String, Node> entry : nodes.entrySet()) {
jsonObject.put(entry.getKey(), entry.getValue().toJSONObject());
}
return jsonObject;
}
public boolean isEmpty() {
return nodes.isEmpty();
}
}

20
src/main/java/io/github/chronosx88/JGUN/storageBackends/StorageBackend.java Normal file
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@ -0,0 +1,20 @@
package io.github.chronosx88.JGUN.storageBackends;
import io.github.chronosx88.JGUN.Node;
import org.json.JSONObject;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
public interface StorageBackend {
Node getNode(String soul);
void addNode(String soul, Node node);
boolean hasNode(String soul);
Set<Map.Entry<String, Node>> entries();
Collection<Node> nodes();
String toString();
String toPrettyString();
JSONObject toJSONObject();
boolean isEmpty();
}