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Automatically trying to connect to the best node after DEFAULT_INITIAL_DELAY milliseconds, regardless of the completion of the node latency verifications

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Nelson R. Perez 2018-10-19 00:10:11 -05:00
parent a5f0ba1345
commit 8fb9bc57d6
1 changed files with 33 additions and 7 deletions
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40
graphenej/src/main/java/cy/agorise/graphenej/api/android/NetworkService.java
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@ -2,7 +2,6 @@ package cy.agorise.graphenej.api.android;
import android.app.Service;
import android.content.Intent;
import java.util.concurrent.TimeUnit;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
@ -20,6 +19,7 @@ import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.MissingResourceException;
import java.util.concurrent.TimeUnit;
import cy.agorise.graphenej.Asset;
import cy.agorise.graphenej.AssetAmount;
@ -83,6 +83,11 @@ public class NetworkService extends Service {
// Time to wait before retrying a connection attempt
private final int DEFAULT_RETRY_DELAY = 500;
// Default connection delay when using the node latency verification strategy. This initial
// delay is required in order ot make sure we have a fair selection of node latencies from
// which we can choose from.
private final int DEFAULT_INITIAL_DELAY = 2000;
/**
* Constant to be used as a key in order to pass the user name information, in case the
* provided API nodes might require this information.
@ -183,6 +188,8 @@ public class NetworkService extends Service {
// Property used to keep track of the currently active node
private FullNode mSelectedNode;
private Handler mHandler = new Handler();
private Gson gson = new GsonBuilder()
.registerTypeAdapter(Transaction.class, new Transaction.TransactionDeserializer())
.registerTypeAdapter(TransferOperation.class, new TransferOperation.TransferDeserializer())
@ -216,7 +223,7 @@ public class NetworkService extends Service {
.connectTimeout(2, TimeUnit.SECONDS)
.build();
mSelectedNode = nodeProvider.getBestNode();
Log.v(TAG,"connect.url: "+ mSelectedNode.getUrl());
Log.v(TAG,"connect.url: "+ mSelectedNode.getUrl()+", latency: "+mSelectedNode.getLatencyValue());
Request request = new Request.Builder().url(mSelectedNode.getUrl()).build();
mWebSocket = client.newWebSocket(request, mWebSocketListener);
}
@ -317,11 +324,34 @@ public class NetworkService extends Service {
nodeLatencyVerifier = new NodeLatencyVerifier(fullNodes);
fullNodePublishSubject = nodeLatencyVerifier.start();
fullNodePublishSubject.observeOn(AndroidSchedulers.mainThread()).subscribe(nodeLatencyObserver);
mHandler.postDelayed(mConnectAttempt, DEFAULT_INITIAL_DELAY);
}
}
return mBinder;
}
/**
* Runnable that will perform a connection attempt with the best node after DEFAULT_INITIAL_DELAY
* milliseconds. This is used only if the node latency verification is activated.
*
* The reason to delay the initial connection is that we want to ideally connect to the best node,
* meaning the one that offers the lowest latency value. But we have to give some time for the
* first node latency measurement round to finish in order to have at least a partial result set
* that could be used.
*/
private Runnable mConnectAttempt = new Runnable() {
@Override
public void run() {
FullNode fullNode = nodeProvider.getBestNode();
if(fullNode != null){
Log.i(TAG, String.format("Connected with %d latency results", latencyUpdateCounter));
connect();
}else{
mHandler.postDelayed(this, DEFAULT_INITIAL_DELAY);
}
}
};
/**
* Observer used to be notified about node latency measurement updates.
*/
@ -335,11 +365,7 @@ public class NetworkService extends Service {
// Updating the node with the new latency measurement
nodeProvider.updateNode(fullNode);
// Once we have the latency value of all available nodes,
// we can safely proceed to start the connection
if(latencyUpdateCounter == nodeProvider.getSortedNodes().size()){
connect();
}
Log.v(TAG, String.format("URL: %s, latency: %.2f", fullNode.getUrl(), fullNode.getLatencyValue()));
}
@Override