Basic bridge failover lookup implementation

src/main/groovy/io/kamax/mxisd/lookup/fetcher/IBridgeFetcher.groovy

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.lookup.fetcher
+
+import io.kamax.mxisd.lookup.SingleLookupRequest
+import io.kamax.mxisd.lookup.ThreePidMapping
+
+interface IBridgeFetcher {
+
+    Optional<?> find(SingleLookupRequest request)
+
+    List<ThreePidMapping> populate(List<ThreePidMapping> mappings)
+
+}