Moved agent to instrument

2008-10-27 13:41:19 +00:00
parent 4ea298a7b0
commit 577da8f891
11 changed files with 15 additions and 31 deletions
--- a/org.springframework.instrument/src/main/java/org/springframework/instrument/InstrumentationSavingAgent.java
+++ b/org.springframework.instrument/src/main/java/org/springframework/instrument/InstrumentationSavingAgent.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2002-2008 the original author or authors.
+ *
+ * Licensed 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 org.springframework.instrument;
+
+import java.lang.instrument.Instrumentation;
+
+/**
+ * Java agent that saves the {@link Instrumentation} interface from the JVM
+ * for later use.
+ *
+ * @author Rod Johnson
+ * @author Juergen Hoeller
+ * @since 2.0
+ * @see org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver
+ */
+public class InstrumentationSavingAgent {
+
+	private static volatile Instrumentation instrumentation;
+
+
+	/**
+	 * Save the {@link Instrumentation} interface exposed by the JVM.
+	 */
+	public static void premain(String agentArgs, Instrumentation inst) {
+		instrumentation = inst;
+	}
+
+
+	/**
+	 * Return the {@link Instrumentation} interface exposed by the JVM.
+	 * <p>Note that this agent class will typically not be available in the classpath
+	 * unless the agent is actually specified on JVM startup. If you intend to do
+	 * conditional checking with respect to agent availability, consider using
+	 * {@link org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver#getInstrumentation()}
+	 * instead - which will work without the agent class in the classpath as well.
+   * @return the <code>Instrumentation</code> instance previously saved when
+   * the {@link #premain} method was called by the JVM; will be <code>null</code>
+	 * if this class was not used as Java agent when this JVM was started.
+	 * @see org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver#getInstrumentation()
+	 */
+	public static Instrumentation getInstrumentation() {
+		return instrumentation;
+	}
+
+}
--- a/org.springframework.instrument/src/main/java/overview.html
+++ b/org.springframework.instrument/src/main/java/overview.html
@@ -0,0 +1,7 @@
+<html>
+<body>
+<p>
+The Spring Data Binding framework, an internal library used by Spring Web Flow.
+</p>
+</body>
+</html>