| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2015 EfficiOS Inc. |
| 5 | * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com> |
| 6 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
| 7 | */ |
| 8 | |
| 9 | package org.lttng.ust.agent.client; |
| 10 | |
| 11 | import java.nio.ByteBuffer; |
| 12 | import java.nio.ByteOrder; |
| 13 | |
| 14 | import org.lttng.ust.agent.session.EventRule; |
| 15 | import org.lttng.ust.agent.session.LogLevelSelector; |
| 16 | |
| 17 | /** |
| 18 | * Session daemon command indicating to the Java agent that some events were |
| 19 | * enabled in the tracing session. |
| 20 | * |
| 21 | * @author Alexandre Montplaisir |
| 22 | * @author David Goulet |
| 23 | */ |
| 24 | class SessiondEnableEventCommand extends SessiondCommand { |
| 25 | |
| 26 | /** Fixed event name length. Value defined by the lttng agent protocol. */ |
| 27 | private static final int EVENT_NAME_LENGTH = 256; |
| 28 | |
| 29 | private final boolean commandIsValid; |
| 30 | |
| 31 | /* Parameters of the event rule being enabled */ |
| 32 | private final String eventName; |
| 33 | private final LogLevelSelector logLevelFilter; |
| 34 | private final String filterString; |
| 35 | |
| 36 | public SessiondEnableEventCommand(byte[] data) { |
| 37 | if (data == null) { |
| 38 | throw new IllegalArgumentException(); |
| 39 | } |
| 40 | ByteBuffer buf = ByteBuffer.wrap(data); |
| 41 | buf.order(ByteOrder.BIG_ENDIAN); |
| 42 | int logLevel = buf.getInt(); |
| 43 | int logLevelType = buf.getInt(); |
| 44 | logLevelFilter = new LogLevelSelector(logLevel, logLevelType); |
| 45 | |
| 46 | /* Read the event name */ |
| 47 | byte[] eventNameBytes = new byte[EVENT_NAME_LENGTH]; |
| 48 | buf.get(eventNameBytes); |
| 49 | eventName = new String(eventNameBytes, SESSIOND_PROTOCOL_CHARSET).trim(); |
| 50 | |
| 51 | /* Read the filter string */ |
| 52 | filterString = readNextString(buf); |
| 53 | |
| 54 | /* The command was invalid if the string could not be read correctly */ |
| 55 | commandIsValid = (filterString != null); |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public LttngAgentResponse execute(ILttngTcpClientListener agent) { |
| 60 | if (!commandIsValid) { |
| 61 | return LttngAgentResponse.FAILURE_RESPONSE; |
| 62 | } |
| 63 | |
| 64 | EventRule rule = new EventRule(eventName, logLevelFilter, filterString); |
| 65 | boolean success = agent.eventEnabled(rule); |
| 66 | return (success ? LttngAgentResponse.SUCESS_RESPONSE : LttngAgentResponse.FAILURE_RESPONSE); |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public String toString() { |
| 71 | return "SessiondEnableEventCommand[" |
| 72 | + "eventName=" + eventName |
| 73 | + ", logLevel=" + logLevelFilter.toString() |
| 74 | + ", filterString=" + filterString |
| 75 | +"]"; |
| 76 | } |
| 77 | } |