106 lines
3.6 KiB
Java
106 lines
3.6 KiB
Java
/*
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* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package nsk.share.jvmti;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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import java.util.concurrent.locks.Condition;
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import java.util.concurrent.TimeUnit;
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import nsk.share.Failure;
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/**
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* Functions to set and wait for states in threads.
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* Used to sync main thread and debuggee thread.
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*/
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public class ThreadState {
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private final Lock lock = new ReentrantLock();
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private final Condition cond = lock.newCondition();
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private volatile String currentState;
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private long timeoutMs;
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public ThreadState(String startState, long timeoutMs) {
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currentState = startState;
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this.timeoutMs = timeoutMs;
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}
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/**
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* Set new state.
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*/
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public void setState(String newState) {
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lock.lock();
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try {
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log(MSG_SET_STATE, newState);
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currentState = newState;
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cond.signalAll();
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} finally {
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lock.unlock();
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}
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}
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/**
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* Wait for the specified state.
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* Throws Failure if timeout.
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*/
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public void waitForState(String waitState) {
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lock.lock();
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try {
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log(MSG_WAIT_STATE, waitState);
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while (!currentState.equals(waitState)) {
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if (!cond.await(timeoutMs, TimeUnit.MILLISECONDS)) {
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throw new Failure(format(MSG_TIMEOUT, waitState));
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}
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}
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log(MSG_GOT_STATE, waitState);
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} catch (InterruptedException e) {
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e.printStackTrace();
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throw new Failure(e);
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} finally {
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lock.unlock();
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}
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}
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/**
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* Simple helper that sets a new state and then wait for another state.
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*/
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public void setAndWait(String newState, String waitState) {
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setState(newState);
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waitForState(waitState);
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}
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private static final String MSG_TIMEOUT = "ThreadState(thread='%s', state='%s') timeout waiting for %s";
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private static final String MSG_SET_STATE = "ThreadState(thread='%s', state='%s') set state to %s";
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private static final String MSG_WAIT_STATE = "ThreadState(thread='%s', state='%s') waiting for state %s";
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private static final String MSG_GOT_STATE = "ThreadState(thread='%s', state='%s') got state %s";
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private String format(String pattern, String state) {
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final String threadName = Thread.currentThread().getName();
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return String.format(pattern, threadName, currentState, state);
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}
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private void log(String pattern, String state) {
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System.out.println(format(pattern, state));
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}
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}
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