88 lines
2.7 KiB
88 lines
2.7 KiB
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
* Copyright (C) 2016 Mopria Alliance, Inc.
|
|
*
|
|
* 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.android.bips;
|
|
|
|
import android.print.PrintJobId;
|
|
import android.print.PrinterId;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.List;
|
|
import java.util.UUID;
|
|
import java.util.concurrent.CopyOnWriteArrayList;
|
|
|
|
/** Manages a job queue, ensuring only one job is printed at a time */
|
|
class JobQueue {
|
|
private final List<LocalPrintJob> mJobs = new CopyOnWriteArrayList<>();
|
|
private LocalPrintJob mCurrent;
|
|
|
|
/** Queue a print job for printing at the next available opportunity */
|
|
void print(LocalPrintJob job) {
|
|
mJobs.add(job);
|
|
startNextJob();
|
|
}
|
|
|
|
/** Cancel any previously queued job for a printer with the supplied ID. */
|
|
void cancel(PrinterId printerId) {
|
|
for (LocalPrintJob job : mJobs) {
|
|
if (printerId.equals(job.getPrintJob().getInfo().getPrinterId())) {
|
|
cancel(job.getPrintJobId());
|
|
}
|
|
}
|
|
|
|
if (mCurrent != null && printerId.equals(mCurrent.getPrintJob().getInfo().getPrinterId())) {
|
|
cancel(mCurrent.getPrintJobId());
|
|
}
|
|
}
|
|
|
|
/** Restart any blocked job for a printer with this ID. */
|
|
void restart(PrinterId printerId) {
|
|
if (mCurrent != null && printerId.equals(mCurrent.getPrintJob().getInfo().getPrinterId())) {
|
|
mCurrent.restart();
|
|
}
|
|
}
|
|
|
|
/** Cancel a previously queued job */
|
|
void cancel(PrintJobId id) {
|
|
// If a job hasn't started, kill it instantly.
|
|
for (LocalPrintJob job : mJobs) {
|
|
if (job.getPrintJobId().equals(id)) {
|
|
mJobs.remove(job);
|
|
job.getPrintJob().cancel();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (mCurrent != null && mCurrent.getPrintJobId().equals(id)) {
|
|
mCurrent.cancel();
|
|
}
|
|
}
|
|
|
|
/** Launch the next job if possible */
|
|
private void startNextJob() {
|
|
if (mJobs.isEmpty() || mCurrent != null) {
|
|
return;
|
|
}
|
|
|
|
mCurrent = mJobs.remove(0);
|
|
mCurrent.start(job -> {
|
|
mCurrent = null;
|
|
startNextJob();
|
|
});
|
|
}
|
|
}
|