From 82a1f43f1543f7bc7a94e6fe83fd8f84793fe647 Mon Sep 17 00:00:00 2001
From: Matthew Davidson <matthew@modulolotus.net>
Date: Thu, 30 May 2019 04:05:53 -0400
Subject: [PATCH] Added a Registry.find() (#478)

Add find() method that will only return an existing object in a Registry
but will not create a new one.
---
 .../java/io/github/resilience4j/core/Registry.java   |  7 +++++++
 .../resilience4j/core/registry/AbstractRegistry.java |  5 +++++
 .../core/registry/AbstractRegistryTest.java          | 12 +++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/resilience4j-core/src/main/java/io/github/resilience4j/core/Registry.java b/resilience4j-core/src/main/java/io/github/resilience4j/core/Registry.java
index e47ca5223d..f597906ab7 100644
--- a/resilience4j-core/src/main/java/io/github/resilience4j/core/Registry.java
+++ b/resilience4j-core/src/main/java/io/github/resilience4j/core/Registry.java
@@ -38,6 +38,13 @@ public interface Registry<E, C> {
 	 */
 	void addConfiguration(String configName, C configuration);
 
+	/**
+	 * Find a named entry in the Registry
+	 *
+	 * @param name    the  name
+	 */
+	Optional<E> find(String name);
+
 	/**
 	 * Remove an entry from the Registry
 	 *
diff --git a/resilience4j-core/src/main/java/io/github/resilience4j/core/registry/AbstractRegistry.java b/resilience4j-core/src/main/java/io/github/resilience4j/core/registry/AbstractRegistry.java
index e20c15475e..7584dd878c 100644
--- a/resilience4j-core/src/main/java/io/github/resilience4j/core/registry/AbstractRegistry.java
+++ b/resilience4j-core/src/main/java/io/github/resilience4j/core/registry/AbstractRegistry.java
@@ -58,6 +58,11 @@ protected E computeIfAbsent(String name, Supplier<E> supplier){
 		});
 	}
 
+	@Override
+	public Optional<E> find(String name){
+		return Optional.ofNullable(entryMap.get(name));
+	}
+
 	@Override
 	public Optional<E> remove(String name){
 		Optional<E> removedEntry = Optional.ofNullable(entryMap.remove(name));
diff --git a/resilience4j-core/src/test/java/io/github/resilience4j/core/registry/AbstractRegistryTest.java b/resilience4j-core/src/test/java/io/github/resilience4j/core/registry/AbstractRegistryTest.java
index 1907a649a5..2d6e26e416 100644
--- a/resilience4j-core/src/test/java/io/github/resilience4j/core/registry/AbstractRegistryTest.java
+++ b/resilience4j-core/src/test/java/io/github/resilience4j/core/registry/AbstractRegistryTest.java
@@ -76,6 +76,16 @@ public void shouldConsumeRegistryEvents() {
 
 	}
 
+	@Test
+	public void shouldOnlyFindRegisteredObjects() {
+		TestRegistry testRegistry = new TestRegistry();
+
+		assertThat(testRegistry.find("test")).isEmpty();
+		testRegistry.entryMap.put("test", "value");
+		assertThat(testRegistry.find("test")).contains("value");
+	}
+
+
 	class TestRegistry extends AbstractRegistry<String, String> {
 
 		public TestRegistry() {
@@ -85,4 +95,4 @@ public TestRegistry() {
 		}
 	}
 
-}
\ No newline at end of file
+}