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/*
* Copyright (c) 2016, LinkedKeeper
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of LinkedKeeper nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.gateway.notify;
import java.util.concurrent.TimeUnit;
public class NotifyFuture implements java.util.concurrent.Future {
private final int timeout;
private volatile Object result;
private short waiters;
/**
* Future
*/
private final long genTime = System.currentTimeMillis();
/**
* Future
*/
private volatile long sentTime;
public NotifyFuture(int timeout) {
this.timeout = timeout;
}
public boolean cancel(boolean mayInterruptIfRunning) {
Object result = this.result;
if (isDone0(result)) {
return false;
}
synchronized (this) {
// Allow only once
result = this.result;
if (isDone0(result)) {
return false;
}
if (hasWaiters()) {
notifyAll();
}
}
return true;
}
public boolean isCancelled() {
return false;
}
public boolean isDone() {
return isDone0(result);
}
public boolean isDone0(Object result) {
return result != null && (Boolean) result;
}
public V get() throws InterruptedException {
return get(timeout, TimeUnit.MILLISECONDS);
}
public V get(long timeout, TimeUnit unit) throws InterruptedException {
timeout = unit.toMillis(timeout); // Turn to milliseconds
long remainTime = timeout - (sentTime - genTime); // Residual time
if (remainTime <= 0) { // There is no time to wait
if (isDone()) { // Directly to see if it has been returned
return getNow();
}
} else { // Waiting for the rest of time
if (await(remainTime, TimeUnit.MILLISECONDS)) {
return getNow();
}
}
throw new InterruptedException("wait reply timeout.");
}
public V getNow() {
Object result = this.result;
return (V) result;
}
public boolean isSuccess() {
Object result = this.result;
if (result == null) {
return false;
}
return (Boolean) result;
}
public boolean await(long timeout, TimeUnit unit) throws InterruptedException {
return await0(unit.toNanos(timeout), true);
}
private boolean await0(long timeoutNanos, boolean interruptAble) throws InterruptedException {
if (isDone()) {
return true;
}
if (timeoutNanos <= 0) {
return isDone();
}
if (interruptAble && Thread.interrupted()) {
throw new InterruptedException(toString());
}
long startTime = System.nanoTime();
long waitTime = timeoutNanos;
boolean interrupted = false;
try {
synchronized (this) {
if (isDone()) {
return true;
}
if (waitTime <= 0) {
return isDone();
}
incWaiters();
try {
for (; ; ) {
try {
wait(waitTime / 1000000, (int) (waitTime % 1000000));
} catch (InterruptedException e) {
if (interruptAble) {
throw e;
} else {
interrupted = true;
}
}
if (isDone()) {
return true;
} else {
waitTime = timeoutNanos - (System.nanoTime() - startTime);
if (waitTime <= 0) {
return isDone();
}
}
}
} finally {
decWaiters();
}
}
} finally {
if (interrupted) {
Thread.currentThread().interrupt();
}
}
}
public NotifyFuture setSuccess(V result) {
if (setSuccess0(result)) {
return this;
}
throw new IllegalStateException("complete already: " + this);
}
private boolean setSuccess0(V result) {
if (isDone()) {
return false;
}
synchronized (this) {
// Allow only once
if (isDone()) {
return false;
}
if (this.result == null) {
this.result = result;
}
if (hasWaiters()) {
notifyAll();
}
}
return true;
}
public NotifyFuture setFailure(Throwable cause) {
if (setFailure0(cause)) {
return this;
}
throw new IllegalStateException("complete already: " + this, cause);
}
private boolean setFailure0(Throwable cause) {
if (isDone()) {
return false;
}
synchronized (this) {
// Allow only once
if (isDone()) {
return false;
}
result = false;
if (hasWaiters()) {
notifyAll();
}
}
return true;
}
private boolean hasWaiters() {
return waiters > 0;
}
private void incWaiters() {
if (waiters == Short.MAX_VALUE) {
throw new IllegalStateException("too many waiters:" + this);
}
waiters++;
}
private void decWaiters() {
waiters--;
}
public int getTimeout() {
return timeout;
}
/**
*
*
* @param sentTime
*/
public void setSentTime(long sentTime) {
this.sentTime = sentTime;
}
}
