1 files changed, 44 insertions, 0 deletions
diff --git a/dalvik/src/main/java/dalvik/system/profiler/ThreadSampler.java b/dalvik/src/main/java/dalvik/system/profiler/ThreadSampler.java
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+++ b/dalvik/src/main/java/dalvik/system/profiler/ThreadSampler.java
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+/*
+ * Copyright (C) 2010 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 dalvik.system.profiler;
+
+import java.io.IOException;
+
+/**
+ * The {@code ThreadSampler} interfaces allows a profiler to choose
+ * between portable and VM specific implementations of thread
+ * sampling.
+ */
+public interface ThreadSampler {
+
+    /**
+     * Used to specify the maximum stack depth to collect.
+     */
+    public void setDepth(int depth);
+
+    /**
+     * Return a stack trace for the current thread limited by the
+     * maximum depth specified by {@link #setDepth setDepth}. May
+     * return null if no sample is availble for the thread, which may
+     * happen in cases such as thread termination. The resulting array
+     * should be copied before the next call to {@code getStackTrace}
+     * if the caller wants to use the results, since the {@code
+     * ThreadSampler} may reuse the array. Note that the elements
+     * themselves are immutable and do not need to be copied.
+     */
+    public StackTraceElement[] getStackTrace(Thread thread);
+}