org.gradle.test.fixtures.server.http.CyclicBarrierAnyOfRequestHandler Maven / Gradle / Ivy
/*
* Copyright 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.gradle.test.fixtures.server.http;
import com.sun.net.httpserver.HttpExchange;
import org.gradle.internal.time.Clock;
import org.gradle.internal.time.Time;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import static org.gradle.test.fixtures.server.http.CyclicBarrierRequestHandler.format;
import static org.gradle.test.fixtures.server.http.CyclicBarrierRequestHandler.selectPending;
class CyclicBarrierAnyOfRequestHandler implements TrackingHttpHandler, WaitPrecondition, BlockingHttpServer.BlockingHandler {
private final Lock lock;
private final Condition condition;
private final List received = new ArrayList();
private final List released = new ArrayList();
private final List notReleased = new ArrayList();
private final List notReceived = new ArrayList();
private final int testId;
private final int timeoutMs;
private final Clock clock = Time.clock();
private int waitingFor;
private final WaitPrecondition previous;
private long mostRecentEvent;
private boolean cancelled;
private AssertionError failure;
CyclicBarrierAnyOfRequestHandler(Lock lock, int testId, int timeoutMs, int maxConcurrent, WaitPrecondition previous, Collection expectedRequests) {
if (expectedRequests.size() < maxConcurrent) {
throw new IllegalArgumentException("Too few requests specified.");
}
this.lock = lock;
this.condition = lock.newCondition();
this.testId = testId;
this.timeoutMs = timeoutMs;
this.waitingFor = maxConcurrent;
this.previous = previous;
for (ResourceExpectation expectation : expectedRequests) {
ResourceHandlerWrapper handler = new ResourceHandlerWrapper(lock, expectation);
notReceived.add(handler);
}
}
@Override
public WaitPrecondition getWaitPrecondition() {
return this;
}
@Override
public void assertCanWait() throws IllegalStateException {
lock.lock();
try {
if (notReceived.isEmpty() || !released.isEmpty()) {
// Have received all requests, or have released something, so downstream can wait. This isn't quite right
return;
}
previous.assertCanWait();
throw new IllegalStateException(String.format("Cannot wait as no requests have been released. Waiting for %s, received %s.", format(notReceived), received));
} finally {
lock.unlock();
}
}
@Override
public ResponseProducer selectResponseProducer(int id, HttpExchange exchange) throws Exception {
ResourceHandlerWrapper handler;
lock.lock();
try {
if (notReceived.isEmpty()) {
// barrier open, let it travel on
return null;
}
long now = clock.getCurrentTime();
if (mostRecentEvent < now) {
mostRecentEvent = now;
}
String path = exchange.getRequestURI().getPath().substring(1);
handler = selectPending(notReceived, path);
if (handler == null || !handler.getMethod().equals(exchange.getRequestMethod()) || waitingFor == 0) {
failure = new UnexpectedRequestException(String.format("Unexpected request %s /%s received. Waiting for %s further requests, already received %s, released %s, still expecting %s.", exchange.getRequestMethod(), path, waitingFor, received, released, format(notReceived)));
condition.signalAll();
throw failure;
}
notReceived.remove(handler);
notReleased.add(handler);
received.add(exchange.getRequestMethod() + " /" + path);
handler.received();
waitingFor--;
if (waitingFor == 0) {
condition.signalAll();
}
while (!handler.isReleased() && failure == null && !cancelled) {
long waitMs = mostRecentEvent + timeoutMs - clock.getCurrentTime();
if (waitMs < 0) {
if (waitingFor > 0) {
System.out.println(String.format("[%d] timeout waiting for other requests", id));
throw timeoutWaitingForRequests();
}
System.out.println(String.format("[%d] timeout waiting to be released", id));
failure = new AssertionError(String.format("Timeout waiting to be released. Waiting for %s further requests, received %s, released %s, not yet received %s.", waitingFor, received, released, format(notReceived)));
condition.signalAll();
throw failure;
}
System.out.println(String.format("[%d] waiting to be released. Still waiting for %s further requests, already received %s", id, waitingFor, received));
condition.await(waitMs, TimeUnit.MILLISECONDS);
}
if (failure != null) {
// Broken in another thread
System.out.println(String.format("[%d] failure in another thread", id));
throw failure;
}
if (cancelled) {
return new ResponseProducer() {
@Override
public void writeTo(int requestId, HttpExchange exchange) {
try {
exchange.sendResponseHeaders(200, -1);
} catch (IOException e) {
// Ignore
}
}
};
}
} finally {
lock.unlock();
}
return handler;
}
@Override
public void cancelBlockedRequests() {
lock.lock();
try {
cancelled = true;
condition.signalAll();
} finally {
lock.unlock();
}
}
@Override
public void assertComplete(Collection failures) throws AssertionError {
lock.lock();
try {
if (failure != null) {
// Already reported
return;
}
if (!notReceived.isEmpty()) {
failures.add(new AssertionError(String.format("Did not handle all expected requests. Waiting for %d further requests, received %s, released %s, not yet received %s.", waitingFor, received, released, format(notReceived))));
}
} finally {
lock.unlock();
}
}
@Override
public void release(String path) {
path = BlockingHttpServer.normalizePath(path);
lock.lock();
try {
ResourceHandlerWrapper handler = selectPending(notReleased, path);
if (handler == null) {
throw new IllegalStateException("Expected request already released.");
}
if (!handler.isReceived()) {
throw new IllegalStateException("Expected request not received, should wait for pending calls first.");
}
System.out.println(String.format("[%d] releasing %s", testId, path));
released.add(handler.getMethod() + " " + path);
handler.released();
notReleased.remove(handler);
doRelease(1);
} finally {
lock.unlock();
}
}
@Override
public void releaseAll() {
lock.lock();
try {
if (!notReceived.isEmpty()) {
throw new IllegalStateException("Expected requests not received, should wait for pending calls first.");
}
doReleaseAll();
} finally {
lock.unlock();
}
}
protected void doReleaseAll() {
lock.lock();
try {
int count = 0;
for (ResourceHandlerWrapper resourceHandler : notReleased) {
System.out.println(String.format("[%d] releasing %s", testId, resourceHandler.getPath()));
released.add(resourceHandler.getMethod() + " " + resourceHandler.getPath());
resourceHandler.released();
count++;
}
notReleased.clear();
doRelease(count);
} finally {
lock.unlock();
}
}
@Override
public void release(int count) {
lock.lock();
try {
if (notReleased.size() < count) {
throw new IllegalStateException("Too few requests released, should wait for pending calls first.");
}
for (int i = 0; i < count; i++) {
ResourceHandlerWrapper resourceHandler = notReleased.remove(0);
System.out.println(String.format("[%d] releasing %s", testId, resourceHandler.getPath()));
released.add(resourceHandler.getMethod() + " " + resourceHandler.getPath());
resourceHandler.released();
}
doRelease(count);
} finally {
lock.unlock();
}
}
private void doRelease(int count) {
waitingFor = Math.min(notReceived.size(), waitingFor + count);
System.out.println(String.format("[%d] now expecting %d further requests, received %s, released %s, not yet received %s", testId, waitingFor, received, released, format(notReceived)));
condition.signalAll();
}
@Override
public void waitForAllPendingCalls() {
lock.lock();
try {
previous.assertCanWait();
long now = clock.getCurrentTime();
if (mostRecentEvent < now) {
mostRecentEvent = now;
}
while (waitingFor > 0 && failure == null) {
long waitMs = mostRecentEvent + timeoutMs - clock.getCurrentTime();
if (waitMs < 0) {
System.out.println(String.format("[%d] timeout waiting for expected requests.", testId));
throw timeoutWaitingForRequests();
}
System.out.println(String.format("[%d] waiting for %d further requests, received %s, released %s, not yet received %s", testId, waitingFor, received, released, format(notReceived)));
try {
condition.await(waitMs, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
if (failure != null) {
throw failure;
}
System.out.println(String.format("[%d] expected requests received, received %s, released %s, not yet received %s", testId, received, released, format(notReceived)));
} finally {
lock.unlock();
}
}
private AssertionError timeoutWaitingForRequests() {
failure = new AssertionError(String.format("Timeout waiting for expected requests. Waiting for %d further requests, received %s, released %s, not yet received %s.", waitingFor, received, released, format(notReceived)));
condition.signalAll();
throw failure;
}
}
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