95 lines
3.6 KiB
Java
95 lines
3.6 KiB
Java
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.metrics;
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import java.util.Arrays;
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import java.util.BitSet;
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/**
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* A batch of DNS events recorded by NetdEventListenerService for a specific network.
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* {@hide}
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*/
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final public class DnsEvent {
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private static final int SIZE_LIMIT = 20000;
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// Network id of the network associated with the event, or 0 if unspecified.
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public final int netId;
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// Transports of the network associated with the event, as defined in NetworkCapabilities.
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// It is the caller responsability to ensure the value of transports does not change between
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// calls to addResult.
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public final long transports;
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// The number of DNS queries recorded. Queries are stored in the structure-of-array style where
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// the eventTypes, returnCodes, and latenciesMs arrays have the same length and the i-th event
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// is spread across the three array at position i.
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public int eventCount;
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// The number of successful DNS queries recorded.
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public int successCount;
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// The types of DNS queries as defined in INetdEventListener.
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public byte[] eventTypes;
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// Current getaddrinfo codes go from 1 to EAI_MAX = 15. gethostbyname returns errno, but there
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// are fewer than 255 errno values. So we store the result code in a byte as well.
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public byte[] returnCodes;
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// Latencies in milliseconds of queries, stored as ints.
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public int[] latenciesMs;
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public DnsEvent(int netId, long transports, int initialCapacity) {
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this.netId = netId;
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this.transports = transports;
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eventTypes = new byte[initialCapacity];
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returnCodes = new byte[initialCapacity];
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latenciesMs = new int[initialCapacity];
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}
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boolean addResult(byte eventType, byte returnCode, int latencyMs) {
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boolean isSuccess = (returnCode == 0);
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if (eventCount >= SIZE_LIMIT) {
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// TODO: implement better rate limiting that does not biases metrics.
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return isSuccess;
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}
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if (eventCount == eventTypes.length) {
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resize((int) (1.4 * eventCount));
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}
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eventTypes[eventCount] = eventType;
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returnCodes[eventCount] = returnCode;
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latenciesMs[eventCount] = latencyMs;
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eventCount++;
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if (isSuccess) {
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successCount++;
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}
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return isSuccess;
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}
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public void resize(int newLength) {
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eventTypes = Arrays.copyOf(eventTypes, newLength);
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returnCodes = Arrays.copyOf(returnCodes, newLength);
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latenciesMs = Arrays.copyOf(latenciesMs, newLength);
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}
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@Override
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public String toString() {
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StringBuilder builder =
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new StringBuilder("DnsEvent(").append("netId=").append(netId)
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.append(", transports=")
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.append(BitSet.valueOf(new long[] { transports }))
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.append(", ");
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builder.append(String.format("%d events, ", eventCount));
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builder.append(String.format("%d success)", successCount));
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return builder.toString();
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}
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}
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