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Move NetworkStatsFactory to faster ProcFileReader.

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Less GC overhead, and about 8x faster parse times.  Verified that
tests pass.

Change-Id: Iff1d374f36103395a193176a88a57eebffa93c56
This commit is contained in:
Jeff Sharkey
2012-02-27 18:08:01 -08:00
parent 00b8bb6e79
commit be68c7c5c7
1 changed files with 15 additions and 70 deletions
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85
core/java/com/android/internal/net/NetworkStatsFactory.java
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@@ -28,7 +28,6 @@ import android.util.Slog;
import com.android.internal.util.ProcFileReader;
import com.google.android.collect.Lists;
import com.google.android.collect.Maps;
import com.google.android.collect.Sets;
import java.io.BufferedReader;
@@ -37,7 +36,6 @@ import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.StringTokenizer;
@@ -63,22 +61,6 @@ public class NetworkStatsFactory {
/** Path to {@code /proc/net/xt_qtaguid/stats}. */
private final File mStatsXtUid;
/** {@link #mStatsXtUid} and {@link #mStatsXtIfaceAll} headers. */
private static final String KEY_IDX = "idx";
private static final String KEY_IFACE = "iface";
private static final String KEY_ACTIVE = "active";
private static final String KEY_UID = "uid_tag_int";
private static final String KEY_COUNTER_SET = "cnt_set";
private static final String KEY_TAG_HEX = "acct_tag_hex";
private static final String KEY_SNAP_RX_BYTES = "snap_rx_bytes";
private static final String KEY_SNAP_RX_PACKETS = "snap_rx_packets";
private static final String KEY_SNAP_TX_BYTES = "snap_tx_bytes";
private static final String KEY_SNAP_TX_PACKETS = "snap_tx_packets";
private static final String KEY_RX_BYTES = "rx_bytes";
private static final String KEY_RX_PACKETS = "rx_packets";
private static final String KEY_TX_BYTES = "tx_bytes";
private static final String KEY_TX_PACKETS = "tx_packets";
public NetworkStatsFactory() {
this(new File("/proc/"));
}
@@ -112,44 +94,34 @@ public class NetworkStatsFactory {
final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);
final NetworkStats.Entry entry = new NetworkStats.Entry();
// TODO: transition to ProcFileReader
// TODO: read directly from proc once headers are added
final ArrayList<String> keys = Lists.newArrayList(KEY_IFACE, KEY_ACTIVE, KEY_SNAP_RX_BYTES,
KEY_SNAP_RX_PACKETS, KEY_SNAP_TX_BYTES, KEY_SNAP_TX_PACKETS, KEY_RX_BYTES,
KEY_RX_PACKETS, KEY_TX_BYTES, KEY_TX_PACKETS);
final ArrayList<String> values = Lists.newArrayList();
final HashMap<String, String> parsed = Maps.newHashMap();
BufferedReader reader = null;
ProcFileReader reader = null;
try {
reader = new BufferedReader(new FileReader(mStatsXtIfaceAll));
reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceAll));
String line;
while ((line = reader.readLine()) != null) {
splitLine(line, values);
parseLine(keys, values, parsed);
entry.iface = parsed.get(KEY_IFACE);
while (reader.hasMoreData()) {
entry.iface = reader.nextString();
entry.uid = UID_ALL;
entry.set = SET_DEFAULT;
entry.tag = TAG_NONE;
final boolean active = reader.nextInt() != 0;
// always include snapshot values
entry.rxBytes = getParsedLong(parsed, KEY_SNAP_RX_BYTES);
entry.rxPackets = getParsedLong(parsed, KEY_SNAP_RX_PACKETS);
entry.txBytes = getParsedLong(parsed, KEY_SNAP_TX_BYTES);
entry.txPackets = getParsedLong(parsed, KEY_SNAP_TX_PACKETS);
entry.rxBytes = reader.nextLong();
entry.rxPackets = reader.nextLong();
entry.txBytes = reader.nextLong();
entry.txPackets = reader.nextLong();
// fold in active numbers, but only when active
final boolean active = getParsedInt(parsed, KEY_ACTIVE) != 0;
if (active) {
entry.rxBytes += getParsedLong(parsed, KEY_RX_BYTES);
entry.rxPackets += getParsedLong(parsed, KEY_RX_PACKETS);
entry.txBytes += getParsedLong(parsed, KEY_TX_BYTES);
entry.txPackets += getParsedLong(parsed, KEY_TX_PACKETS);
entry.rxBytes += reader.nextLong();
entry.rxPackets += reader.nextLong();
entry.txBytes += reader.nextLong();
entry.txPackets += reader.nextLong();
}
stats.addValues(entry);
reader.finishLine();
}
} catch (NullPointerException e) {
throw new IllegalStateException("problem parsing stats: " + e);
@@ -315,18 +287,6 @@ public class NetworkStatsFactory {
return stats;
}
@Deprecated
private static int getParsedInt(HashMap<String, String> parsed, String key) {
final String value = parsed.get(key);
return value != null ? Integer.parseInt(value) : 0;
}
@Deprecated
private static long getParsedLong(HashMap<String, String> parsed, String key) {
final String value = parsed.get(key);
return value != null ? Long.parseLong(value) : 0;
}
/**
* Split given line into {@link ArrayList}.
*/
@@ -340,21 +300,6 @@ public class NetworkStatsFactory {
}
}
/**
* Zip the two given {@link ArrayList} as key and value pairs into
* {@link HashMap}.
*/
@Deprecated
private static void parseLine(
ArrayList<String> keys, ArrayList<String> values, HashMap<String, String> outParsed) {
outParsed.clear();
final int size = Math.min(keys.size(), values.size());
for (int i = 0; i < size; i++) {
outParsed.put(keys.get(i), values.get(i));
}
}
/**
* Utility method to read a single plain-text {@link Long} from the given
* {@link File}, usually from a {@code /proc/} filesystem.