Merge pull request #5 from GraphQLGuide/apolloclient-kotlin-object

Use Kotlin object keyword for Apollo Client singleton

Author: lorensr

app/src/main/java/guide/graphql/toc/data/Apollo.kt

@@ -4,10 +4,15 @@ import com.apollographql.apollo.ApolloClient
 import com.apollographql.apollo.cache.normalized.lru.EvictionPolicy
 import com.apollographql.apollo.cache.normalized.lru.LruNormalizedCacheFactory
 
-val cacheFactory =
-    LruNormalizedCacheFactory(EvictionPolicy.builder().maxSizeBytes(10 * 1024 * 1024).build())
+object Apollo {
 
-val apolloClient: ApolloClient = ApolloClient.builder()
-    .serverUrl("https://api.graphql.guide/graphql")
-    .normalizedCache(cacheFactory)
-    .build()
+    val client: ApolloClient by lazy {
+        val cacheFactory =
+            LruNormalizedCacheFactory(EvictionPolicy.builder().maxSizeBytes(10 * 1024 * 1024).build())
+
+        ApolloClient.builder()
+            .serverUrl("https://api.graphql.guide/graphql")
+            .normalizedCache(cacheFactory)
+            .build()
+    }
+}

app/src/main/java/guide/graphql/toc/ui/chapters/ChaptersFragment.kt

@@ -15,7 +15,7 @@ import com.apollographql.apollo.exception.ApolloException
 import com.google.android.material.transition.MaterialSharedAxis
 import guide.graphql.toc.ChaptersQuery
 import guide.graphql.toc.R
-import guide.graphql.toc.data.apolloClient
+import guide.graphql.toc.data.Apollo
 import guide.graphql.toc.databinding.ChaptersFragmentBinding
 
 class ChaptersFragment : Fragment() {
@@ -73,7 +73,7 @@ class ChaptersFragment : Fragment() {
 
         lifecycleScope.launchWhenStarted {
             try {
-                val response = apolloClient.query(
+                val response = Apollo.client.query(
                     ChaptersQuery()
                 ).toDeferred().await()
                 if (response.hasErrors()) {

app/src/main/java/guide/graphql/toc/ui/sections/SectionsFragment.kt

@@ -13,7 +13,7 @@ import com.apollographql.apollo.coroutines.toDeferred
 import com.apollographql.apollo.exception.ApolloException
 import com.google.android.material.transition.MaterialSharedAxis
 import guide.graphql.toc.SectionsQuery
-import guide.graphql.toc.data.apolloClient
+import guide.graphql.toc.data.Apollo
 import guide.graphql.toc.databinding.SectionsFragmentBinding
 
 class SectionsFragment : Fragment() {
@@ -66,7 +66,7 @@ class SectionsFragment : Fragment() {
             binding.spinner.visibility = View.VISIBLE
             binding.error.visibility = View.GONE
             try {
-                val response = apolloClient.query(
+                val response = Apollo.client.query(
                     SectionsQuery(id = args.chapterId)
                 ).toDeferred().await()