solution: enable load-balancing by default

Author: kanazirsky

build.gradle

@@ -1,5 +1,3 @@
-import org.gradle.testing.jacoco.tasks.JacocoReport
-
 buildscript {
     repositories {
         mavenLocal()
@@ -27,7 +25,7 @@ if (System.getenv("ENABLE_GCP") == "true") {
 }
 
 group = 'io.emeraldpay'
-version = '0.12-alpha.3'
+version = '0.12-alpha.4'
 
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
@@ -160,4 +158,4 @@ task coverageReport(type: JacocoReport) {
         csv.enabled false
         html.enabled true
     }
-}
+}

src/main/java/io/emeraldpay/api/EmeraldConnection.java

@@ -1,12 +1,10 @@
 package io.emeraldpay.api;
 
-import io.grpc.Channel;
-import io.grpc.ManagedChannelBuilder;
-import io.grpc.netty.NettyChannelBuilder;
+import io.grpc.*;
+import io.grpc.netty.*;
 
-import java.io.IOException;
-import java.net.InetAddress;
-import java.util.function.Function;
+import java.net.*;
+import java.util.function.*;
 
 /**
  * A connection configuration to access Emerald APIs
@@ -43,6 +41,7 @@ public static class Builder {
         private String host;
         private Integer port;
         private boolean usePlaintext = false;
+        private boolean useLoadBalancing = true;
 
         /**
          * Default Netty config allows messages up to 4Mb, but in practice Ethereum RPC responses may be larger. Here it allows up to 32Mb by default.
@@ -95,6 +94,11 @@ public Builder usePlaintext() {
             return this;
         }
 
+        public Builder disableLoadBalancing() {
+            this.useLoadBalancing = false;
+            return this;
+        }
+
         /**
          * St max inbound message size. Default is 32mb.
          *
@@ -153,6 +157,10 @@ public EmeraldConnection build() {
                 channelBuilder = nettyChannelBuilder;
             }
 
+            if (useLoadBalancing) {
+                channelBuilder.defaultLoadBalancingPolicy("round_robin");
+            }
+
             return new EmeraldConnection(channelBuilder.build());
         }