co.elastic.apm.attach.JvmAttachUtils Maven / Gradle / Ivy
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/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package co.elastic.apm.attach;
import co.elastic.apm.attach.bytebuddy.agent.ByteBuddyAgent;
import java.util.Properties;
/**
* Allows convenient access to current JVM utilities provided by bytebuddy which is relocated on packaging.
*/
public class JvmAttachUtils {
public static final String CURRENT_PID = ByteBuddyAgent.ProcessProvider.ForCurrentVm.INSTANCE.resolve();
public static Properties getAgentAndSystemProperties(String pid) {
ByteBuddyAgent.AttachmentProvider.Accessor accessor = ElasticAttachmentProvider.get().attempt();
if (!accessor.isAvailable()) {
throw new IllegalStateException("No compatible attachment provider is available");
}
try {
Class vm = accessor.getVirtualMachineType();
Object virtualMachineInstance = vm
.getMethod("attach", String.class)
.invoke(null, pid);
try {
Properties agentProperties = (Properties) vm.getMethod("getAgentProperties").invoke(virtualMachineInstance);
Properties systemProperties = (Properties) vm.getMethod("getSystemProperties").invoke(virtualMachineInstance);
systemProperties.putAll(agentProperties);
return systemProperties;
} finally {
vm.getMethod("detach").invoke(virtualMachineInstance);
}
} catch (Exception e) {
throw new IllegalStateException("Error during attachment using: " + accessor, e);
}
}
}