diff --git a/services/mediaresourcemanager/ServiceLog.cpp b/services/mediaresourcemanager/ServiceLog.cpp
new file mode 100644
index 0000000..be7b308
--- /dev/null
+++ b/services/mediaresourcemanager/ServiceLog.cpp
@@ -0,0 +1,54 @@
+/*
+**
+** Copyright 2015, 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.
+*/
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "ServiceLog"
+#include <utils/Log.h>
+
+#include <time.h>
+
+#include "ServiceLog.h"
+
+static const size_t kDefaultMaxNum = 100;
+
+namespace android {
+
+ServiceLog::ServiceLog() : mMaxNum(kDefaultMaxNum) {}
+ServiceLog::ServiceLog(size_t maxNum) : mMaxNum(maxNum) {}
+
+void ServiceLog::add(const String8 &log) {
+    Mutex::Autolock lock(mLock);
+    time_t now = time(0);
+    char buf[64];
+    strftime(buf, sizeof(buf), "%m-%d %T", localtime(&now));
+    String8 formattedLog = String8::format("%s %s", buf, log.string());
+    if (mLogs.add(formattedLog) == mMaxNum) {
+        mLogs.removeAt(0);
+    }
+}
+
+String8 ServiceLog::toString() const {
+    Mutex::Autolock lock(mLock);
+    String8 result;
+    for (size_t i = 0; i < mLogs.size(); ++i) {
+        result.append(mLogs[i]);
+        result.append("\n");
+    }
+    return result;
+}
+
+} // namespace android