Add new flyweight

1 files changed, 108 insertions, 0 deletions

diff --git a/app/src/test/kotlin/com/pitchedapps/frost/rx/FlyweightTest.kt b/app/src/test/kotlin/com/pitchedapps/frost/rx/FlyweightTest.kt
new file mode 100644
index 00000000..834163bd
--- /dev/null
+++ b/app/src/test/kotlin/com/pitchedapps/frost/rx/FlyweightTest.kt
@@ -0,0 +1,108 @@
+package com.pitchedapps.frost.rx
+
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.runBlocking
+import org.junit.Rule
+import org.junit.rules.Timeout
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+import kotlin.test.fail
+
+class FlyweightTest {
+
+    @get:Rule
+    val globalTimeout: Timeout = Timeout.seconds(5)
+
+    lateinit var flyweight: Flyweight<Int, Int>
+
+    lateinit var callCount: AtomicInteger
+
+    private val LONG_RUNNING_KEY = -78
+
+    @BeforeTest
+    fun before() {
+        callCount = AtomicInteger(0)
+        flyweight = Flyweight(GlobalScope, 100, 200L) {
+            callCount.incrementAndGet()
+            when (it) {
+                LONG_RUNNING_KEY -> Thread.sleep(100000)
+                else -> Thread.sleep(100)
+            }
+            it * 2
+        }
+    }
+
+    @Test
+    fun basic() {
+        assertEquals(2, runBlocking { flyweight.fetch(1) }, "Invalid result")
+        assertEquals(1, callCount.get(), "1 call expected")
+    }
+
+    @Test
+    fun multipleWithOneKey() {
+        val results: List<Int> = runBlocking {
+            (0..1000).map {
+                flyweight.scope.async {
+                    flyweight.fetch(1)
+                }
+            }.map { it.await() }
+        }
+        assertEquals(1, callCount.get(), "1 call expected")
+        assertEquals(1001, results.size, "Incorrect number of results returned")
+        assertTrue(results.all { it == 2 }, "Result should all be 2")
+    }
+
+    @Test
+    fun consecutiveReuse() {
+        runBlocking {
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "1 call expected")
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "Reuse expected")
+            Thread.sleep(300)
+            flyweight.fetch(1)
+            assertEquals(2, callCount.get(), "Refetch expected")
+        }
+    }
+
+    @Test
+    fun invalidate() {
+        runBlocking {
+            flyweight.fetch(1)
+            assertEquals(1, callCount.get(), "1 call expected")
+            flyweight.invalidate(1)
+            flyweight.fetch(1)
+            assertEquals(2, callCount.get(), "New call expected")
+        }
+    }
+
+    @Test
+    fun destroy() {
+        runBlocking {
+            val longRunningResult = async { flyweight.fetch(LONG_RUNNING_KEY) }
+            flyweight.fetch(1)
+            flyweight.cancel()
+            try {
+                flyweight.fetch(1)
+                fail("Flyweight should not be fulfilled after it is destroyed")
+            } catch (e: Exception) {
+                assertEquals("Flyweight is not active", e.message, "Incorrect error found on fetch after destruction")
+            }
+            try {
+                longRunningResult.await()
+                fail("Flyweight should have cancelled previously running requests")
+            } catch (e: Exception) {
+                assertEquals(
+                    "Flyweight cancelled",
+                    e.message,
+                    "Incorrect error found on fetch cancelled by destruction"
+                )
+            }
+            println("Done")
+        }
+    }
+}
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