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Gradle 6.9.1 API redistribution.
/*
* 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.UncheckedException;
import org.gradle.internal.time.Clock;
import org.gradle.internal.time.Time;
import javax.annotation.Nullable;
import java.io.IOException;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
class ExpectMaxNConcurrentRequests 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 LinkedList notReleased = new LinkedList<>();
private final List notReceived = new ArrayList<>();
private final int testId;
private final long timeoutMs;
private final Clock clock = Time.clock();
private int waitingFor;
private final WaitPrecondition previous;
private long mostRecentEvent;
private boolean cancelled;
private final ExpectationState state = new ExpectationState();
ExpectMaxNConcurrentRequests(Lock lock, int testId, Duration timeout, 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 = timeout.toMillis();
this.waitingFor = maxConcurrent;
this.previous = previous;
for (ResourceExpectation expectation : expectedRequests) {
ResourceHandlerWrapper handler = new ResourceHandlerWrapper(lock, expectation, getWaitPrecondition(), isAutoRelease());
notReceived.add(handler);
}
}
protected boolean isAutoRelease() {
return false;
}
@Override
public WaitPrecondition getWaitPrecondition() {
return this;
}
@Override
public void assertCanWait() throws IllegalStateException {
lock.lock();
try {
previous.assertCanWait();
if (notReceived.isEmpty()) {
// Have received all requests so downstream can wait.
return;
}
if (!isAutoRelease()) {
throw new IllegalStateException(String.format("Cannot wait as no requests have been released. Waiting for %s, received %s.", format(notReceived), format(received)));
}
} finally {
lock.unlock();
}
}
@Override
public boolean expecting(HttpExchange exchange) {
if (notReceived.isEmpty()) {
return false;
}
String path = exchange.getRequestURI().getPath().substring(1);
ResourceHandlerWrapper handler = selectPending(notReceived, path);
return handler != null;
}
@Override
public ResponseProducer selectResponseProducer(int id, HttpExchange exchange) {
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) {
ResponseProducer failure = state.unexpectedRequest(exchange.getRequestMethod(), path, describeCurrentState());
condition.signalAll();
return failure;
}
notReceived.remove(handler);
notReleased.add(handler);
received.add(handler);
handler.received();
waitingFor--;
if (waitingFor == 0) {
condition.signalAll();
}
if (state.isFailed()) {
// Broken in another thread
System.out.println(String.format("[%d] failure in another thread", id));
return state.alreadyFailed(exchange.getRequestMethod(), path, describeCurrentState());
}
if (waitingFor == 0) {
System.out.println(String.format("[%d] signalling all requests ready", id));
onExpectedRequestsReceived(this, notReceived.size());
}
while (!handler.isReleased() && !state.isFailed() && !cancelled) {
long waitMs = mostRecentEvent + timeoutMs - clock.getCurrentTime();
if (waitMs < 0) {
ResponseProducer failure;
if (waitingFor > 0) {
System.out.println(String.format("[%d] timeout waiting for other requests", id));
failure = state.timeout(exchange.getRequestMethod(), path, "waiting for other requests", describeCurrentState());
} else {
System.out.println(String.format("[%d] timeout waiting to be released", id));
failure = state.timeout(exchange.getRequestMethod(), path, "waiting to be released", describeCurrentState());
}
condition.signalAll();
return failure;
}
System.out.println(String.format("[%d] waiting to be released. Still waiting for %s further requests, already received %s", id, waitingFor, format(received)));
try {
condition.await(waitMs, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}
if (state.isFailed()) {
// Broken in another thread
System.out.println(String.format("[%d] failure in another thread", id));
if (waitingFor > 0) {
return state.failureWhileWaiting(exchange.getRequestMethod(), path, "waiting for other requests", describeCurrentState());
} else {
return state.failureWhileWaiting(exchange.getRequestMethod(), path, "waiting to be released", describeCurrentState());
}
}
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;
}
/**
* Called when the expected requests have been received and are now blocked waiting to be released.
* Subclasses may choose to release some or all of the requests.
*/
protected void onExpectedRequestsReceived(BlockingHttpServer.BlockingHandler handler, int yetToBeReceived) {
}
private String describeCurrentState() {
return String.format("Waiting for %s further requests, received %s, released %s, not yet received %s", waitingFor, format(received), format(released), format(notReceived));
}
@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 (state.isFailed()) {
// Already reported
return;
}
if (!notReceived.isEmpty()) {
failures.add(new AssertionError(String.format("Did not receive all expected requests. %s", describeCurrentState())));
}
} 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, handler));
released.add(handler);
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.getDisplayName()));
released.add(resourceHandler);
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.removeFirst();
System.out.println(String.format("[%d] releasing %s", testId, resourceHandler.getDisplayName()));
released.add(resourceHandler);
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, format(received), format(released), format(notReceived)));
condition.signalAll();
}
@Override
public void waitForAllPendingCalls() {
waitForAllPendingCalls(BlockingHttpServer.FailureTracker.NO_FAILURE_TRACKER);
}
@Override
public void waitForAllPendingCalls(BlockingHttpServer.FailureTracker failureTracker) {
lock.lock();
try {
previous.assertCanWait();
long now = clock.getCurrentTime();
if (mostRecentEvent < now) {
mostRecentEvent = now;
}
while (waitingFor > 0 && !state.isFailed() && failureTracker.getFailure() == null) {
long waitMs = mostRecentEvent + timeoutMs - clock.getCurrentTime();
if (waitMs < 0) {
System.out.println(String.format("[%d] timeout waiting for expected requests.", testId));
timeoutWaitingForRequests();
break;
}
System.out.println(String.format("[%d] waiting for %d further requests, received %s, released %s, not yet received %s", testId, waitingFor, format(received), format(released), format(notReceived)));
try {
condition.await(waitMs, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
if (failureTracker.getFailure() != null) {
throw failureTracker.getFailure();
}
if (state.isFailed()) {
throw state.getWaitFailure(describeCurrentState());
}
System.out.println(String.format("[%d] expected requests received, received %s, released %s, not yet received %s", testId, format(received), format(released), format(notReceived)));
} finally {
lock.unlock();
}
}
private void timeoutWaitingForRequests() {
state.timeout("waiting for expected requests", describeCurrentState());
condition.signalAll();
}
private static String format(List handlers) {
StringBuilder builder = new StringBuilder();
builder.append("[");
for (ResourceHandlerWrapper handler : handlers) {
if (builder.length() > 1) {
builder.append(", ");
}
builder.append(handler.getDisplayName());
}
builder.append("]");
return builder.toString();
}
@Nullable
private static T selectPending(List handlers, String path) {
for (T handler : handlers) {
if (handler.getPath().equals(path)) {
return handler;
}
}
return null;
}
}
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