Merge "Add in-memory storage for listeners used by RecoverableKeyStoreLoader"

services/core/java/com/android/server/locksettings/recoverablekeystore/ListenersStorage.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package com.android.server.locksettings.recoverablekeystore;
+
+import android.annotation.Nullable;
+import android.app.PendingIntent;
+
+import com.android.internal.annotations.VisibleForTesting;
+
+import java.util.Map;
+import java.util.HashMap;
+
+/**
+ * In memory storage for listeners to be notified when new recovery snapshot is available.
+ * Note: implementation is not thread safe and it is used to mock final {@link PendingIntent}
+ * class.
+ *
+ * @hide
+ */
+public class ListenersStorage {
+    private Map<Integer, PendingIntent> mAgentIntents = new HashMap<>();
+
+    private static final ListenersStorage mInstance = new ListenersStorage();
+    public static ListenersStorage getInstance() {
+        return mInstance;
+    }
+
+    /**
+     * Sets new listener for the recovery agent, identified by {@code uid}
+     *
+     * @param recoveryAgentUid uid
+     * @param intent PendingIntent which will be triggered than new snapshot is available.
+     */
+    public void setSnapshotListener(int recoveryAgentUid, @Nullable PendingIntent intent) {
+        mAgentIntents.put(recoveryAgentUid, intent);
+    }
+
+    /**
+     * Notifies recovery agent, that new snapshot is available.
+     * Does nothing if a listener was not registered.
+     *
+     * @param recoveryAgentUid uid.
+     */
+    public void recoverySnapshotAvailable(int recoveryAgentUid) {
+        PendingIntent intent = mAgentIntents.get(recoveryAgentUid);
+        if (intent != null) {
+            try {
+                intent.send();
+            } catch (PendingIntent.CanceledException e) {
+                // Ignore - sending intent is not allowed.
+            }
+        }
+    }
+}