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Effort to shrink parent process’ resource footprint as much as possible #52

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Effort to shrink parent process’ resource footprint as much as possible #52

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15 changes: 15 additions & 0 deletions mainWrapper/src/main/java/com/cleanroommc/relauncher/wrapper/RelaunchMainWrapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@
import java.lang.invoke.MethodType;

public class RelaunchMainWrapper {

private static final int PARENT_READY_SIGNAL = 1;

public static void main(String[] args) throws Throwable {
String mainClassName = System.getProperty("cleanroom.relauncher.mainClass");
long parentId = Long.parseLong(System.getProperty("cleanroom.relauncher.parent"));
Expand All @@ -12,6 +15,8 @@ public static void main(String[] args) throws Throwable {
.or(thisProcess::parent)
.orElseThrow(() -> new RuntimeException("Unable to grab parent process!"));

awaitParentReady(parentProcess);

// Parent watcher (Java 9+)
parentProcess.onExit().thenRun(() -> System.exit(0));

Expand All @@ -20,4 +25,14 @@ public static void main(String[] args) throws Throwable {
.invoke((Object) args);
}

private static void awaitParentReady(ProcessHandle parentProcess) throws Exception {
int signal = System.in.read();
if (signal == -1 || !parentProcess.isAlive()) {
System.exit(0);
}
if (signal != PARENT_READY_SIGNAL) {
throw new IllegalStateException("Received an invalid parent cleanup handshake");
}
}

}
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