1 files changed, 116 insertions, 0 deletions
diff --git a/sidecar/fproxy/src/main/java/org/onap/aaf/fproxy/cache/InMemoryCredentialCache.java b/sidecar/fproxy/src/main/java/org/onap/aaf/fproxy/cache/InMemoryCredentialCache.java
new file mode 100644
index 0000000..44ce0cd
--- /dev/null
+++ b/sidecar/fproxy/src/main/java/org/onap/aaf/fproxy/cache/InMemoryCredentialCache.java
@@ -0,0 +1,116 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aaf
+ * ================================================================================
+ * Copyright © 2018 European Software Marketing Ltd.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.aaf.fproxy.cache;
+
+import java.lang.ref.SoftReference;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.DelayQueue;
+import java.util.concurrent.Delayed;
+import java.util.concurrent.TimeUnit;
+import org.onap.aaf.fproxy.data.CredentialCacheData;
+
+public class InMemoryCredentialCache implements CredentialCache {
+
+    private final ConcurrentHashMap<String, SoftReference<CredentialCacheData>> cache = new ConcurrentHashMap<>();
+    private final DelayQueue<DelayedCacheObject> cleaningUpQueue = new DelayQueue<>();
+
+    public InMemoryCredentialCache() {
+        Thread cleanerThread = new Thread(() -> {
+            while (!Thread.currentThread().isInterrupted()) {
+                try {
+                    DelayedCacheObject delayedCacheObject = cleaningUpQueue.take();
+                    cache.remove(delayedCacheObject.getKey(), delayedCacheObject.getReference());
+                } catch (InterruptedException e) {
+                    Thread.currentThread().interrupt();
+                }
+            }
+        });
+        cleanerThread.setDaemon(true);
+        cleanerThread.start();
+    }
+
+    @Override
+    public void add(String key, CredentialCacheData value, long periodInMillis) {
+        if (key == null) {
+            return;
+        }
+        if (value == null) {
+            cache.remove(key);
+        } else {
+            long expiryTime = System.currentTimeMillis() + periodInMillis;
+            SoftReference<CredentialCacheData> reference = new SoftReference<>(value);
+            cache.put(key, reference);
+            cleaningUpQueue.put(new DelayedCacheObject(key, reference, expiryTime));
+        }
+    }
+
+    @Override
+    public void remove(String key) {
+        cache.remove(key);
+    }
+
+    @Override
+    public CredentialCacheData get(String key) {
+        return Optional.ofNullable(cache.get(key)).map(SoftReference::get).orElse(null);
+    }
+
+    @Override
+    public void clear() {
+        cache.clear();
+    }
+
+    @Override
+    public long size() {
+        return cache.size();
+    }
+
+    private static class DelayedCacheObject implements Delayed {
+
+        private final String key;
+        private final SoftReference<CredentialCacheData> reference;
+        private final long expiryTime;
+
+        public DelayedCacheObject(String key, SoftReference<CredentialCacheData> reference, long expiryTime) {
+            super();
+            this.key = key;
+            this.reference = reference;
+            this.expiryTime = expiryTime;
+        }
+
+        @Override
+        public long getDelay(TimeUnit unit) {
+            return unit.convert(expiryTime - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
+        }
+
+        @Override
+        public int compareTo(Delayed o) {
+            return Long.compare(expiryTime, ((DelayedCacheObject) o).expiryTime);
+        }
+
+        public String getKey() {
+            return key;
+        }
+
+        public SoftReference<CredentialCacheData> getReference() {
+            return reference;
+        }
+    }
+}