fjc40
89b0aa8b77
Added ConnectionToServerCommandFactory, and JoinSuccessfulCommand, RaceParticipantsFullCOmmand, ServerFullCommand. Added IncomingHeartBeatCommandFactory, and IncomingHeartBeatCommand. Added ConnectionToServerState, which represents the client's connection state to server. Renamed VisualiserInput to VisualiserRaceController. Added ConnectionToServer, which tracks the client's connection to server. Added ConnectionToServerController, which accepts JoinAcceptance messages, turns them into commands, and passes them to ConnectionToServer. Added IncomingHeartBeatService, which tracks the heart beat status of the connection. Added IncomingHeartBeatController, which accepts HeartBeat messages, turns them into commands, and passes them to IncomingHeartBeatService. Refactored ServerConnection a bit. #story[1095]
110 lines
2.7 KiB
Java
110 lines
2.7 KiB
Java
package visualiser.network;
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import mock.model.commandFactory.Command;
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import shared.model.RunnableWithFramePeriod;
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import java.util.concurrent.BlockingQueue;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* Tracks the heart beat status of a connection.
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*/
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public class IncomingHeartBeatService implements RunnableWithFramePeriod {
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/**
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* Timestamp of the last sent heartbeat message.
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*/
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private long lastHeartbeatTime;
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/**
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* Sequence number for heartbeat messages.
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*/
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private long lastHeartBeatSeqNum;
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/**
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* The incoming commands to execute.
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*/
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private BlockingQueue<Command> incomingCommands;
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/**
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* Creates an {@link IncomingHeartBeatService} which executes commands from a given queue.
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* @param incomingCommands Queue to read and execute commands from.
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*/
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public IncomingHeartBeatService(BlockingQueue<Command> incomingCommands) {
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this.incomingCommands = incomingCommands;
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this.lastHeartbeatTime = System.currentTimeMillis();
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this.lastHeartBeatSeqNum = -1;
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}
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/**
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* Sets the last heart beat time to a given value.
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* @param lastHeartbeatTime Timestamp of heartbeat.
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*/
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public void setLastHeartbeatTime(long lastHeartbeatTime) {
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this.lastHeartbeatTime = lastHeartbeatTime;
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}
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/**
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* Sets the last heart beat sequence number to a given value.
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* @param lastHeartBeatSeqNum Sequence number of heartbeat.
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*/
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public void setLastHeartBeatSeqNum(long lastHeartBeatSeqNum) {
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this.lastHeartBeatSeqNum = lastHeartBeatSeqNum;
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}
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/**
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* Calculates the time since last heartbeat, in milliseconds.
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*
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* @return Time since last heartbeat, in milliseconds..
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*/
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private long timeSinceHeartbeat() {
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long now = System.currentTimeMillis();
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return (now - lastHeartbeatTime);
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}
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/**
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* Returns whether or not the heartBeat service considers the connection "alive".
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* Going 10,000ms without receiving a heartBeat means that the connection is "dead".
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* @return True if alive, false if dead.
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*/
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public boolean isAlive() {
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long heartBeatPeriod = 10000;
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return (timeSinceHeartbeat() < heartBeatPeriod);
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}
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@Override
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public void run() {
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while (!Thread.interrupted()) {
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try {
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Command command = incomingCommands.take();
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command.execute();
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} catch (InterruptedException e) {
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Logger.getGlobal().log(Level.SEVERE, "IncomingHeartBeatService: " + this + " was interrupted on thread: " + Thread.currentThread() + " while reading command.", e);
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Thread.currentThread().interrupt();
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}
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}
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}
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}
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