| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2016 EfficiOS Inc. |
| 5 | * Copyright (C) 2016 Alexandre Montplaisir <alexmonthy@efficios.com> |
| 6 | */ |
| 7 | |
| 8 | package org.lttng.ust.agent.client; |
| 9 | |
| 10 | import java.nio.ByteBuffer; |
| 11 | import java.nio.ByteOrder; |
| 12 | |
| 13 | /** |
| 14 | * Session daemon command indicating to the Java agent that an |
| 15 | * application-specific context was enabled in the tracing session. |
| 16 | * |
| 17 | * @author Alexandre Montplaisir |
| 18 | */ |
| 19 | class SessiondEnableAppContextCommand extends SessiondCommand { |
| 20 | |
| 21 | private final String retrieverName; |
| 22 | private final String contextName; |
| 23 | |
| 24 | private final boolean commandIsValid; |
| 25 | |
| 26 | public SessiondEnableAppContextCommand(byte[] data) { |
| 27 | if (data == null) { |
| 28 | throw new IllegalArgumentException(); |
| 29 | } |
| 30 | ByteBuffer buf = ByteBuffer.wrap(data); |
| 31 | buf.order(ByteOrder.BIG_ENDIAN); |
| 32 | |
| 33 | /* |
| 34 | * The buffer contains the retriever name first, followed by the |
| 35 | * context's name. |
| 36 | */ |
| 37 | retrieverName = readNextString(buf); |
| 38 | contextName = readNextString(buf); |
| 39 | |
| 40 | /* If any of these strings were null then the command was invalid */ |
| 41 | commandIsValid = ((retrieverName != null) && (contextName != null)); |
| 42 | } |
| 43 | |
| 44 | @Override |
| 45 | public LttngAgentResponse execute(ILttngTcpClientListener agent) { |
| 46 | if (!commandIsValid) { |
| 47 | return LttngAgentResponse.FAILURE_RESPONSE; |
| 48 | } |
| 49 | |
| 50 | boolean success = agent.appContextEnabled(retrieverName, contextName); |
| 51 | return (success ? LttngAgentResponse.SUCESS_RESPONSE : LttngAgentResponse.FAILURE_RESPONSE); |
| 52 | } |
| 53 | } |