com.google.gerrit.server.RequestCleanup Maven / Gradle / Ivy
// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.server;
import com.google.common.flogger.FluentLogger;
import com.google.inject.servlet.RequestScoped;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/** Registers cleanup activities to be completed when a scope ends. */
@RequestScoped
public class RequestCleanup implements Runnable {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final List cleanup = new ArrayList<>();
private boolean ran;
/** Register a task to be completed after the request ends. */
public void add(Runnable task) {
synchronized (cleanup) {
assertNotRan();
cleanup.add(task);
}
}
@Override
public void run() {
synchronized (cleanup) {
assertNotRan();
ran = true;
for (Iterator i = cleanup.iterator(); i.hasNext(); ) {
try {
i.next().run();
} catch (Exception err) {
logger.atSevere().withCause(err).log("Failed to execute per-request cleanup");
}
i.remove();
}
}
}
private void assertNotRan() {
if (ran) {
throw new IllegalStateException("Request has already been cleaned up");
}
}
}