Examples with Instrumenter io.opencensus.contrib.agent.instrumentation.Instrumenter used on opensource projects

Example 1 with Instrumenter

use of io.opencensus.contrib.agent.instrumentation.Instrumenter in project instrumentation-java by census-instrumentation.

the class AgentMain method premain.

/**
 * Initializes the OpenCensus Agent for Java.
 *
 * @param agentArgs agent options, passed as a single string by the JVM
 * @param instrumentation the {@link Instrumentation} object provided by the JVM for instrumenting
 *     Java programming language code
 * @throws Exception if initialization of the agent fails
 * @see java.lang.instrument
 * @since 0.6
 */
public static void premain(String agentArgs, Instrumentation instrumentation) throws Exception {
    checkNotNull(instrumentation, "instrumentation");
    logger.fine("Initializing.");
    // The classes in bootstrap.jar, such as ContextManger and ContextStrategy, will be referenced
    // from classes loaded by the bootstrap classloader. Thus, these classes have to be loaded by
    // the bootstrap classloader, too.
    instrumentation.appendToBootstrapClassLoaderSearch(new JarFile(Resources.getResourceAsTempFile("bootstrap.jar")));
    checkLoadedByBootstrapClassloader(ContextTrampoline.class);
    checkLoadedByBootstrapClassloader(ContextStrategy.class);
    Settings settings = Settings.load();
    AgentBuilder agentBuilder = new AgentBuilder.Default().disableClassFormatChanges().with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION).with(new AgentBuilderListener()).ignore(none());
    for (Instrumenter instrumenter : ServiceLoader.load(Instrumenter.class)) {
        agentBuilder = instrumenter.instrument(agentBuilder, settings);
    }
    agentBuilder.installOn(instrumentation);
    logger.fine("Initialized.");
}