am 78551bc7: am ba4ac518: Merge "Improve debugging for issue #7586414: AlarmManager wakelocks held" into jb-mr1.1-dev

* commit '78551bc7d5541c86503b32db0e3e2564218bf179':
  Improve debugging for issue #7586414: AlarmManager wakelocks held

1 files changed, 66 insertions, 0 deletions

diff --git a/core/java/com/android/internal/util/LocalLog.java b/core/java/com/android/internal/util/LocalLog.java
new file mode 100644
index 0000000..f0e6171
--- /dev/null
+++ b/core/java/com/android/internal/util/LocalLog.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 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.internal.util;
+
+import java.io.PrintWriter;
+import java.util.ArrayList;
+
+import android.util.Slog;
+
+/**
+ * Helper class for logging serious issues, which also keeps a small
+ * snapshot of the logged events that can be printed later, such as part
+ * of a system service's dumpsys output.
+ * @hide
+ */
+public class LocalLog {
+    private final String mTag;
+    private final int mMaxLines = 20;
+    private final ArrayList<String> mLines = new ArrayList<String>(mMaxLines);
+
+    public LocalLog(String tag) {
+        mTag = tag;
+    }
+
+    public void w(String msg) {
+        synchronized (mLines) {
+            Slog.w(mTag, msg);
+            if (mLines.size() >= mMaxLines) {
+                mLines.remove(0);
+            }
+            mLines.add(msg);
+        }
+    }
+
+    public boolean dump(PrintWriter pw, String header, String prefix) {
+        synchronized (mLines) {
+            if (mLines.size() <= 0) {
+                return false;
+            }
+            if (header != null) {
+                pw.println(header);
+            }
+            for (int i=0; i<mLines.size(); i++) {
+                if (prefix != null) {
+                    pw.print(prefix);
+                }
+                pw.println(mLines.get(i));
+            }
+            return true;
+        }
+    }
+}