jdk/test/lib/testlibrary/jdk/testlibrary/Utils.java
Print this page
rev 8840 : 6461635: [TESTBUG] BasicTests.sh test fails intermittently
Summary: Added -Xshare:off and ported from script to java
Contributed-by: mattias.tobiasson@oracle.com
@@ -31,10 +31,12 @@
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
import java.util.Collections;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
/**
* Common library for various test helper functions.
*/
public final class Utils {
@@ -168,6 +170,63 @@
"Cannot get hostname");
return hostName;
}
+ /**
+ * Uses "jcmd -l" to search for a jvm pid. This function will wait
+ * forever (until jtreg timeout) for the pid to be found.
+ * @param key Regular expression to search for
+ * @return The found pid.
+ */
+ public static int waitForJvmPid(String key) throws Throwable {
+ final long iterationSleepMillis = 200;
+ System.out.println("waitForJvmPid: Waiting for key '" + key + "'");
+ while (true) {
+ int pid = tryFindJvmPid(key);
+ if (pid >= 0) {
+ return pid;
+ }
+ Thread.sleep(iterationSleepMillis);
+ }
+ }
+
+ /**
+ * Searches for a jvm pid in the output from "jcmd -l".
+ *
+ * Example output from jcmd is:
+ * 12498 sun.tools.jcmd.JCmd -l
+ * 12254 /tmp/jdk8/tl/jdk/JTwork/classes/com/sun/tools/attach/Application.jar
+ *
+ * @param key A regular expression to search for.
+ * @return The found pid, or -1 if Enot found.
+ * @throws Exception If multiple matching jvms are found.
+ */
+ public static int tryFindJvmPid(String key) throws Throwable {
+ ProcessBuilder pb = null;
+ OutputAnalyzer output = null;
+ try {
+ JDKToolLauncher jcmdLauncher = JDKToolLauncher.create("jcmd");
+ jcmdLauncher.addToolArg("-l");
+ output = ProcessTools.executeProcess(jcmdLauncher.getCommand());
+ output.shouldHaveExitValue(0);
+
+ // Search for a line starting with numbers (pid), follwed by the key.
+ Pattern pattern = Pattern.compile("([0-9]+)\\s.*(" + key + ").*\\r?\\n");
+ Matcher matcher = pattern.matcher(output.getStdout());
+
+ int pid = -1;
+ if (matcher.find()) {
+ pid = Integer.parseInt(matcher.group(1));
+ System.out.println("findJvmPid.pid: " + pid);
+ if (matcher.find()) {
+ throw new Exception("Found multiple JVM pids for key: " + key);
+ }
+ }
+ return pid;
+ } catch (Throwable t) {
+ System.out.println(String.format("Utils.findJvmPid(%s) failed: %s", key, t));
+ throw t;
+ }
+ }
+
}