/*
* Copyright 2015-2017 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.glowroot.agent.init;
import java.lang.instrument.Instrumentation;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.annotation.Nullable;
import com.google.common.base.Stopwatch;
import io.netty.util.internal.PlatformDependent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.glowroot.agent.util.AppServerDetection;
import org.glowroot.agent.util.ThreadFactories;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.concurrent.TimeUnit.SECONDS;
public class NettyWorkaround {
private static final Logger startupLogger = LoggerFactory.getLogger("org.glowroot");
private NettyWorkaround() {}
public static void run(final @Nullable Instrumentation instrumentation,
final NettyInit doNettyInit) throws Exception {
if (AppServerDetection.isIbmJvm()) {
// WebSphere crashes on startup without this workaround (at least when pointing to
// glowroot central and using WebSphere 8.5.5.11)
String prior = System.getProperty("io.netty.noUnsafe");
System.setProperty("io.netty.noUnsafe", "true");
try {
if (PlatformDependent.hasUnsafe()) {
throw new IllegalStateException("Netty property to disable usage of UNSAFE was"
+ " not set early enough, please report to the Glowroot project");
}
} finally {
if (prior == null) {
System.clearProperty("io.netty.noUnsafe");
} else {
System.setProperty("io.netty.noUnsafe", prior);
}
}
}
if (instrumentation == null) {
doNettyInit.execute(false);
} else {
// cannot start netty in premain otherwise can crash JVM, at least using Java 1.8.0_25
// on Windows (though fixed now in Java 1.8.0_91)
//
// see https://github.com/netty/netty/issues/3233
// and https://bugs.openjdk.java.net/browse/JDK-8041920
// also see repro for the issue in MethodHandleRelatedCrashIT.java
ExecutorService singleUseExecutor =
Executors.newSingleThreadExecutor(ThreadFactories.create("Glowroot-Init-UI"));
singleUseExecutor.execute(new Runnable() {
@Override
public void run() {
try {
checkNotNull(instrumentation);
waitForMain(instrumentation);
doNettyInit.execute(true);
} catch (Throwable t) {
startupLogger.error(t.getMessage(), t);
}
}
});
}
}
private static void waitForMain(Instrumentation instrumentation) throws InterruptedException {
Stopwatch stopwatch = Stopwatch.createStarted();
while (stopwatch.elapsed(SECONDS) < 60) {
Thread.sleep(100);
for (Class<?> clazz : instrumentation.getInitiatedClasses(null)) {
if (clazz.getName().equals("sun.misc.Launcher")) {
return;
}
}
}
// something has gone wrong
startupLogger.error("sun.misc.Launcher was never loaded");
}
public interface NettyInit {
void execute(boolean alreadyInsideNewThread) throws Exception;
}
}