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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.store.kahadb.scheduler;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.jms.MessageFormatException;
import org.apache.activemq.broker.scheduler.CronParser;
import org.apache.activemq.broker.scheduler.Job;
import org.apache.activemq.broker.scheduler.JobListener;
import org.apache.activemq.broker.scheduler.JobScheduler;
import org.apache.activemq.protobuf.Buffer;
import org.apache.activemq.store.kahadb.data.KahaAddScheduledJobCommand;
import org.apache.activemq.store.kahadb.data.KahaRemoveScheduledJobCommand;
import org.apache.activemq.store.kahadb.data.KahaRemoveScheduledJobsCommand;
import org.apache.activemq.store.kahadb.data.KahaRescheduleJobCommand;
import org.apache.activemq.store.kahadb.disk.index.BTreeIndex;
import org.apache.activemq.store.kahadb.disk.journal.Location;
import org.apache.activemq.store.kahadb.disk.page.Transaction;
import org.apache.activemq.store.kahadb.disk.util.LongMarshaller;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.ServiceStopper;
import org.apache.activemq.util.ServiceSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JobSchedulerImpl extends ServiceSupport implements Runnable, JobScheduler {
private static final Logger LOG = LoggerFactory.getLogger(JobSchedulerImpl.class);
private final JobSchedulerStoreImpl store;
private final AtomicBoolean running = new AtomicBoolean();
private String name;
private BTreeIndex> index;
private Thread thread;
private final AtomicBoolean started = new AtomicBoolean(false);
private final List jobListeners = new CopyOnWriteArrayList();
private static final IdGenerator ID_GENERATOR = new IdGenerator();
private final ScheduleTime scheduleTime = new ScheduleTime();
JobSchedulerImpl(JobSchedulerStoreImpl store) {
this.store = store;
}
public void setName(String name) {
this.name = name;
}
@Override
public String getName() {
return this.name;
}
@Override
public void addListener(JobListener l) {
this.jobListeners.add(l);
}
@Override
public void removeListener(JobListener l) {
this.jobListeners.remove(l);
}
@Override
public void schedule(final String jobId, final ByteSequence payload, final long delay) throws IOException {
doSchedule(jobId, payload, "", 0, delay, 0);
}
@Override
public void schedule(final String jobId, final ByteSequence payload, final String cronEntry) throws Exception {
doSchedule(jobId, payload, cronEntry, 0, 0, 0);
}
@Override
public void schedule(final String jobId, final ByteSequence payload, final String cronEntry, final long delay, final long period, final int repeat) throws IOException {
doSchedule(jobId, payload, cronEntry, delay, period, repeat);
}
@Override
public void remove(final long time) throws IOException {
doRemoveRange(time, time);
}
@Override
public void remove(final String jobId) throws IOException {
doRemove(-1, jobId);
}
@Override
public void removeAllJobs() throws IOException {
doRemoveRange(0, Long.MAX_VALUE);
}
@Override
public void removeAllJobs(final long start, final long finish) throws IOException {
doRemoveRange(start, finish);
}
@Override
public long getNextScheduleTime() throws IOException {
this.store.readLockIndex();
try {
Map.Entry> first = this.index.getFirst(this.store.getPageFile().tx());
return first != null ? first.getKey() : -1l;
} finally {
this.store.readUnlockIndex();
}
}
@Override
public List getNextScheduleJobs() throws IOException {
final List result = new ArrayList();
this.store.readLockIndex();
try {
this.store.getPageFile().tx().execute(new Transaction.Closure() {
@Override
public void execute(Transaction tx) throws IOException {
Map.Entry> first = index.getFirst(tx);
if (first != null) {
for (JobLocation jl : first.getValue()) {
ByteSequence bs = getPayload(jl.getLocation());
Job job = new JobImpl(jl, bs);
result.add(job);
}
}
}
});
} finally {
this.store.readUnlockIndex();
}
return result;
}
private Map.Entry> getNextToSchedule() throws IOException {
this.store.readLockIndex();
try {
if (!this.store.isStopped() && !this.store.isStopping()) {
Map.Entry> first = this.index.getFirst(this.store.getPageFile().tx());
return first;
}
} finally {
this.store.readUnlockIndex();
}
return null;
}
@Override
public List getAllJobs() throws IOException {
final List result = new ArrayList();
this.store.readLockIndex();
try {
this.store.getPageFile().tx().execute(new Transaction.Closure() {
@Override
public void execute(Transaction tx) throws IOException {
Iterator>> iter = index.iterator(store.getPageFile().tx());
while (iter.hasNext()) {
Map.Entry> next = iter.next();
if (next != null) {
for (JobLocation jl : next.getValue()) {
ByteSequence bs = getPayload(jl.getLocation());
Job job = new JobImpl(jl, bs);
result.add(job);
}
} else {
break;
}
}
}
});
} finally {
this.store.readUnlockIndex();
}
return result;
}
@Override
public List getAllJobs(final long start, final long finish) throws IOException {
final List result = new ArrayList();
this.store.readLockIndex();
try {
this.store.getPageFile().tx().execute(new Transaction.Closure() {
@Override
public void execute(Transaction tx) throws IOException {
Iterator>> iter = index.iterator(tx, start);
while (iter.hasNext()) {
Map.Entry> next = iter.next();
if (next != null && next.getKey().longValue() <= finish) {
for (JobLocation jl : next.getValue()) {
ByteSequence bs = getPayload(jl.getLocation());
Job job = new JobImpl(jl, bs);
result.add(job);
}
} else {
break;
}
}
}
});
} finally {
this.store.readUnlockIndex();
}
return result;
}
private void doSchedule(final String jobId, final ByteSequence payload, final String cronEntry, long delay, long period, int repeat) throws IOException {
long startTime = System.currentTimeMillis();
// round startTime - so we can schedule more jobs
// at the same time
startTime = (startTime / 1000) * 1000;
long time = 0;
if (cronEntry != null && cronEntry.length() > 0) {
try {
time = CronParser.getNextScheduledTime(cronEntry, startTime);
} catch (MessageFormatException e) {
throw new IOException(e.getMessage());
}
}
if (time == 0) {
// start time not set by CRON - so it it to the current time
time = startTime;
}
if (delay > 0) {
time += delay;
} else {
time += period;
}
KahaAddScheduledJobCommand newJob = new KahaAddScheduledJobCommand();
newJob.setScheduler(name);
newJob.setJobId(jobId);
newJob.setStartTime(startTime);
newJob.setCronEntry(cronEntry);
newJob.setDelay(delay);
newJob.setPeriod(period);
newJob.setRepeat(repeat);
newJob.setNextExecutionTime(time);
newJob.setPayload(new Buffer(payload.getData(), payload.getOffset(), payload.getLength()));
this.store.store(newJob);
}
private void doReschedule(final String jobId, long executionTime, long nextExecutionTime, int rescheduledCount) throws IOException {
KahaRescheduleJobCommand update = new KahaRescheduleJobCommand();
update.setScheduler(name);
update.setJobId(jobId);
update.setExecutionTime(executionTime);
update.setNextExecutionTime(nextExecutionTime);
update.setRescheduledCount(rescheduledCount);
this.store.store(update);
}
private void doRemove(final long executionTime, final List jobs) throws IOException {
for (JobLocation job : jobs) {
doRemove(executionTime, job.getJobId());
}
}
private void doRemove(long executionTime, final String jobId) throws IOException {
KahaRemoveScheduledJobCommand remove = new KahaRemoveScheduledJobCommand();
remove.setScheduler(name);
remove.setJobId(jobId);
remove.setNextExecutionTime(executionTime);
this.store.store(remove);
}
private void doRemoveRange(long start, long end) throws IOException {
KahaRemoveScheduledJobsCommand destroy = new KahaRemoveScheduledJobsCommand();
destroy.setScheduler(name);
destroy.setStartTime(start);
destroy.setEndTime(end);
this.store.store(destroy);
}
/**
* Adds a new Scheduled job to the index. Must be called under index lock.
*
* This method must ensure that a duplicate add is not processed into the scheduler. On index
* recover some adds may be replayed and we don't allow more than one instance of a JobId to
* exist at any given scheduled time, so filter these out to ensure idempotence.
*
* @param tx
* Transaction in which the update is performed.
* @param command
* The new scheduled job command to process.
* @param location
* The location where the add command is stored in the journal.
*
* @throws IOException if an error occurs updating the index.
*/
protected void process(final Transaction tx, final KahaAddScheduledJobCommand command, Location location) throws IOException {
JobLocation jobLocation = new JobLocation(location);
jobLocation.setJobId(command.getJobId());
jobLocation.setStartTime(command.getStartTime());
jobLocation.setCronEntry(command.getCronEntry());
jobLocation.setDelay(command.getDelay());
jobLocation.setPeriod(command.getPeriod());
jobLocation.setRepeat(command.getRepeat());
long nextExecutionTime = command.getNextExecutionTime();
List values = null;
jobLocation.setNextTime(nextExecutionTime);
if (this.index.containsKey(tx, nextExecutionTime)) {
values = this.index.remove(tx, nextExecutionTime);
}
if (values == null) {
values = new ArrayList();
}
// There can never be more than one instance of the same JobId scheduled at any
// given time, when it happens its probably the result of index recovery and this
// method must be idempotent so check for it first.
if (!values.contains(jobLocation)) {
values.add(jobLocation);
// Reference the log file where the add command is stored to prevent GC.
this.store.incrementJournalCount(tx, location);
this.index.put(tx, nextExecutionTime, values);
this.scheduleTime.newJob();
} else {
this.index.put(tx, nextExecutionTime, values);
LOG.trace("Job {} already in scheduler at this time {}",
jobLocation.getJobId(), jobLocation.getNextTime());
}
}
/**
* Reschedules a Job after it has be fired.
*
* For jobs that are repeating this method updates the job in the index by adding it to the
* jobs list for the new execution time. If the job is not a cron type job then this method
* will reduce the repeat counter if the job has a fixed number of repeats set. The Job will
* be removed from the jobs list it just executed on.
*
* This method must also update the value of the last update location in the JobLocation
* instance so that the checkpoint worker doesn't drop the log file in which that command lives.
*
* This method must ensure that an reschedule command that references a job that doesn't exist
* does not cause an error since it's possible that on recover the original add might be gone
* and so the job should not reappear in the scheduler.
*
* @param tx
* The TX under which the index is updated.
* @param command
* The reschedule command to process.
* @param location
* The location in the index where the reschedule command was stored.
*
* @throws IOException if an error occurs during the reschedule.
*/
protected void process(final Transaction tx, final KahaRescheduleJobCommand command, Location location) throws IOException {
JobLocation result = null;
final List current = this.index.remove(tx, command.getExecutionTime());
if (current != null) {
for (int i = 0; i < current.size(); i++) {
JobLocation jl = current.get(i);
if (jl.getJobId().equals(command.getJobId())) {
current.remove(i);
if (!current.isEmpty()) {
this.index.put(tx, command.getExecutionTime(), current);
}
result = jl;
break;
}
}
} else {
LOG.debug("Process reschedule command for job {} non-existent executime time {}.",
command.getJobId(), command.getExecutionTime());
}
if (result != null) {
Location previousUpdate = result.getLastUpdate();
List target = null;
result.setNextTime(command.getNextExecutionTime());
result.setLastUpdate(location);
result.setRescheduledCount(command.getRescheduledCount());
if (!result.isCron() && result.getRepeat() > 0) {
result.setRepeat(result.getRepeat() - 1);
}
if (this.index.containsKey(tx, command.getNextExecutionTime())) {
target = this.index.remove(tx, command.getNextExecutionTime());
}
if (target == null) {
target = new ArrayList();
}
target.add(result);
// Track the location of the last reschedule command and release the log file
// reference for the previous one if there was one.
this.store.incrementJournalCount(tx, location);
if (previousUpdate != null) {
this.store.decrementJournalCount(tx, previousUpdate);
}
this.index.put(tx, command.getNextExecutionTime(), target);
this.scheduleTime.newJob();
} else {
LOG.debug("Process reschedule command for non-scheduled job {} at executime time {}.",
command.getJobId(), command.getExecutionTime());
}
}
/**
* Removes a scheduled job from the scheduler.
*
* The remove operation can be of two forms. The first is that there is a job Id but no set time
* (-1) in which case the jobs index is searched until the target job Id is located. The alternate
* form is that a job Id and execution time are both set in which case the given time is checked
* for a job matching that Id. In either case once an execution time is identified the job is
* removed and the index updated.
*
* This method should ensure that if the matching job is not found that no error results as it
* is possible that on a recover the initial add command could be lost so the job may not be
* rescheduled.
*
* @param tx
* The transaction under which the index is updated.
* @param command
* The remove command to process.
* @param location
* The location of the remove command in the Journal.
*
* @throws IOException if an error occurs while updating the scheduler index.
*/
void process(final Transaction tx, final KahaRemoveScheduledJobCommand command, Location location) throws IOException {
// Case 1: JobId and no time value means find the job and remove it.
// Case 2: JobId and a time value means find exactly this scheduled job.
Long executionTime = command.getNextExecutionTime();
List values = null;
if (executionTime == -1) {
for (Iterator>> i = this.index.iterator(tx); i.hasNext();) {
Map.Entry> entry = i.next();
List candidates = entry.getValue();
if (candidates != null) {
for (JobLocation jl : candidates) {
if (jl.getJobId().equals(command.getJobId())) {
LOG.trace("Entry {} contains the remove target: {}", entry.getKey(), command.getJobId());
executionTime = entry.getKey();
values = this.index.remove(tx, executionTime);
break;
}
}
}
}
} else {
values = this.index.remove(tx, executionTime);
}
JobLocation removed = null;
// Remove the job and update the index if there are any other jobs scheduled at this time.
if (values != null) {
for (JobLocation job : values) {
if (job.getJobId().equals(command.getJobId())) {
removed = job;
values.remove(removed);
break;
}
}
if (!values.isEmpty()) {
this.index.put(tx, executionTime, values);
}
}
if (removed != null) {
LOG.trace("{} removed from scheduler {}", removed, this);
// Remove the references for add and reschedule commands for this job
// so that those logs can be GC'd when free.
this.store.decrementJournalCount(tx, removed.getLocation());
if (removed.getLastUpdate() != null) {
this.store.decrementJournalCount(tx, removed.getLastUpdate());
}
// now that the job is removed from the index we can store the remove info and
// then dereference the log files that hold the initial add command and the most
// recent update command.
this.store.referenceRemovedLocation(tx, location, removed);
}
}
/**
* Removes all scheduled jobs within a given time range.
*
* The method can be used to clear the entire scheduler index by specifying a range that
* encompasses all time [0...Long.MAX_VALUE] or a single execution time can be removed by
* setting start and end time to the same value.
*
* @param tx
* The transaction under which the index is updated.
* @param command
* The remove command to process.
* @param location
* The location of the remove command in the Journal.
*
* @throws IOException if an error occurs while updating the scheduler index.
*/
protected void process(final Transaction tx, final KahaRemoveScheduledJobsCommand command, Location location) throws IOException {
removeInRange(tx, command.getStartTime(), command.getEndTime(), location);
}
/**
* Removes all jobs from the schedulers index. Must be called with the index locked.
*
* @param tx
* The transaction under which the index entries for this scheduler are removed.
*
* @throws IOException if an error occurs removing the jobs from the scheduler index.
*/
protected void removeAll(Transaction tx) throws IOException {
this.removeInRange(tx, 0, Long.MAX_VALUE, null);
}
/**
* Removes all scheduled jobs within the target range.
*
* This method can be used to remove all the stored jobs by passing a range of [0...Long.MAX_VALUE]
* or it can be used to remove all jobs at a given scheduled time by passing the same time value
* for both start and end. If the optional location parameter is set then this method will update
* the store's remove location tracker with the location value and the Jobs that are being removed.
*
* This method must be called with the store index locked for writes.
*
* @param tx
* The transaction under which the index is to be updated.
* @param start
* The start time for the remove operation.
* @param finish
* The end time for the remove operation.
* @param location (optional)
* The location of the remove command that triggered this remove.
*
* @throws IOException if an error occurs during the remove operation.
*/
protected void removeInRange(Transaction tx, long start, long finish, Location location) throws IOException {
List keys = new ArrayList();
for (Iterator>> i = this.index.iterator(tx, start); i.hasNext();) {
Map.Entry> entry = i.next();
if (entry.getKey().longValue() <= finish) {
keys.add(entry.getKey());
} else {
break;
}
}
for (Long executionTime : keys) {
List values = this.index.remove(tx, executionTime);
if (location != null) {
for (JobLocation job : values) {
LOG.trace("Removing {} scheduled at: {}", job, executionTime);
// Remove the references for add and reschedule commands for this job
// so that those logs can be GC'd when free.
this.store.decrementJournalCount(tx, job.getLocation());
if (job.getLastUpdate() != null) {
this.store.decrementJournalCount(tx, job.getLastUpdate());
}
// now that the job is removed from the index we can store the remove info and
// then dereference the log files that hold the initial add command and the most
// recent update command.
this.store.referenceRemovedLocation(tx, location, job);
}
}
}
}
/**
* Removes a Job from the index using it's Id value and the time it is currently set to
* be executed. This method will only remove the Job if it is found at the given execution
* time.
*
* This method must be called under index lock.
*
* @param tx
* the transaction under which this method is being executed.
* @param jobId
* the target Job Id to remove.
* @param executionTime
* the scheduled time that for the Job Id that is being removed.
*
* @returns true if the Job was removed or false if not found at the given time.
*
* @throws IOException if an error occurs while removing the Job.
*/
protected boolean removeJobAtTime(Transaction tx, String jobId, long executionTime) throws IOException {
boolean result = false;
List jobs = this.index.remove(tx, executionTime);
Iterator jobsIter = jobs.iterator();
while (jobsIter.hasNext()) {
JobLocation job = jobsIter.next();
if (job.getJobId().equals(jobId)) {
jobsIter.remove();
// Remove the references for add and reschedule commands for this job
// so that those logs can be GC'd when free.
this.store.decrementJournalCount(tx, job.getLocation());
if (job.getLastUpdate() != null) {
this.store.decrementJournalCount(tx, job.getLastUpdate());
}
result = true;
break;
}
}
// Return the list to the index modified or unmodified.
this.index.put(tx, executionTime, jobs);
return result;
}
/**
* Walks the Scheduled Job Tree and collects the add location and last update location
* for all scheduled jobs.
*
* This method must be called with the index locked.
*
* @param tx
* the transaction under which this operation was invoked.
*
* @return a list of all referenced Location values for this JobSchedulerImpl
*
* @throws IOException if an error occurs walking the scheduler tree.
*/
protected List getAllScheduledJobs(Transaction tx) throws IOException {
List references = new ArrayList();
for (Iterator>> i = this.index.iterator(tx); i.hasNext();) {
Map.Entry> entry = i.next();
List scheduled = entry.getValue();
for (JobLocation job : scheduled) {
references.add(job);
}
}
return references;
}
@Override
public void run() {
try {
mainLoop();
} catch (Throwable e) {
if (this.running.get() && isStarted()) {
LOG.error("{} Caught exception in mainloop", this, e);
}
} finally {
if (running.get()) {
try {
stop();
} catch (Exception e) {
LOG.error("Failed to stop {}", this);
}
}
}
}
@Override
public String toString() {
return "JobScheduler: " + this.name;
}
protected void mainLoop() {
while (this.running.get()) {
this.scheduleTime.clearNewJob();
try {
long currentTime = System.currentTimeMillis();
// Read the list of scheduled events and fire the jobs, reschedule repeating jobs as
// needed before firing the job event.
Map.Entry> first = getNextToSchedule();
if (first != null) {
List list = new ArrayList(first.getValue());
List toRemove = new ArrayList(list.size());
final long executionTime = first.getKey();
long nextExecutionTime = 0;
if (executionTime <= currentTime) {
for (final JobLocation job : list) {
if (!running.get()) {
break;
}
int repeat = job.getRepeat();
nextExecutionTime = calculateNextExecutionTime(job, currentTime, repeat);
long waitTime = nextExecutionTime - currentTime;
this.scheduleTime.setWaitTime(waitTime);
if (!job.isCron()) {
fireJob(job);
if (repeat != 0) {
// Reschedule for the next time, the scheduler will take care of
// updating the repeat counter on the update.
doReschedule(job.getJobId(), executionTime, nextExecutionTime, job.getRescheduledCount() + 1);
} else {
toRemove.add(job);
}
} else {
if (repeat == 0) {
// This is a non-repeating Cron entry so we can fire and forget it.
fireJob(job);
}
if (nextExecutionTime > currentTime) {
// Reschedule the cron job as a new event, if the cron entry signals
// a repeat then it will be stored separately and fired as a normal
// event with decrementing repeat.
doReschedule(job.getJobId(), executionTime, nextExecutionTime, job.getRescheduledCount() + 1);
if (repeat != 0) {
// we have a separate schedule to run at this time
// so the cron job is used to set of a separate schedule
// hence we won't fire the original cron job to the
// listeners but we do need to start a separate schedule
String jobId = ID_GENERATOR.generateId();
ByteSequence payload = getPayload(job.getLocation());
schedule(jobId, payload, "", job.getDelay(), job.getPeriod(), job.getRepeat());
waitTime = job.getDelay() != 0 ? job.getDelay() : job.getPeriod();
this.scheduleTime.setWaitTime(waitTime);
}
} else {
toRemove.add(job);
}
}
}
// now remove all jobs that have not been rescheduled from this execution
// time, if there are no more entries in that time it will be removed.
doRemove(executionTime, toRemove);
// If there is a job that should fire before the currently set wait time
// we need to reset wait time otherwise we'll miss it.
Map.Entry> nextUp = getNextToSchedule();
if (nextUp != null) {
final long timeUntilNextScheduled = nextUp.getKey() - currentTime;
if (timeUntilNextScheduled < this.scheduleTime.getWaitTime()) {
this.scheduleTime.setWaitTime(timeUntilNextScheduled);
}
}
} else {
this.scheduleTime.setWaitTime(executionTime - currentTime);
}
}
this.scheduleTime.pause();
} catch (Exception ioe) {
LOG.error("{} Failed to schedule job", this.name, ioe);
try {
this.store.stop();
} catch (Exception e) {
LOG.error("{} Failed to shutdown JobSchedulerStore", this.name, e);
}
}
}
}
void fireJob(JobLocation job) throws IllegalStateException, IOException {
LOG.debug("Firing: {}", job);
ByteSequence bs = this.store.getPayload(job.getLocation());
for (JobListener l : jobListeners) {
l.scheduledJob(job.getJobId(), bs);
}
}
@Override
public void startDispatching() throws Exception {
if (!this.running.get()) {
return;
}
if (started.compareAndSet(false, true)) {
this.thread = new Thread(this, "JobScheduler:" + this.name);
this.thread.setDaemon(true);
this.thread.start();
}
}
@Override
public void stopDispatching() throws Exception {
if (started.compareAndSet(true, false)) {
this.scheduleTime.wakeup();
Thread t = this.thread;
this.thread = null;
if (t != null) {
t.join(3000);
}
}
}
@Override
protected void doStart() throws Exception {
this.running.set(true);
}
@Override
protected void doStop(ServiceStopper stopper) throws Exception {
this.running.set(false);
stopDispatching();
}
private ByteSequence getPayload(Location location) throws IllegalStateException, IOException {
return this.store.getPayload(location);
}
long calculateNextExecutionTime(final JobLocation job, long currentTime, int repeat) throws MessageFormatException {
long result = currentTime;
String cron = job.getCronEntry();
if (cron != null && cron.length() > 0) {
result = CronParser.getNextScheduledTime(cron, result);
} else if (job.getRepeat() != 0) {
result += job.getPeriod();
}
return result;
}
void createIndexes(Transaction tx) throws IOException {
this.index = new BTreeIndex>(this.store.getPageFile(), tx.allocate().getPageId());
}
void load(Transaction tx) throws IOException {
this.index.setKeyMarshaller(LongMarshaller.INSTANCE);
this.index.setValueMarshaller(JobLocationsMarshaller.INSTANCE);
this.index.load(tx);
}
void read(DataInput in) throws IOException {
this.name = in.readUTF();
this.index = new BTreeIndex>(this.store.getPageFile(), in.readLong());
this.index.setKeyMarshaller(LongMarshaller.INSTANCE);
this.index.setValueMarshaller(JobLocationsMarshaller.INSTANCE);
}
public void write(DataOutput out) throws IOException {
out.writeUTF(name);
out.writeLong(this.index.getPageId());
}
static class ScheduleTime {
private final int DEFAULT_WAIT = 500;
private final int DEFAULT_NEW_JOB_WAIT = 100;
private boolean newJob;
private long waitTime = DEFAULT_WAIT;
private final Object mutex = new Object();
/**
* @return the waitTime
*/
long getWaitTime() {
return this.waitTime;
}
/**
* @param waitTime
* the waitTime to set
*/
void setWaitTime(long waitTime) {
if (!this.newJob) {
this.waitTime = waitTime > 0 ? waitTime : DEFAULT_WAIT;
}
}
void pause() {
synchronized (mutex) {
try {
mutex.wait(this.waitTime);
} catch (InterruptedException e) {
}
}
}
void newJob() {
this.newJob = true;
this.waitTime = DEFAULT_NEW_JOB_WAIT;
wakeup();
}
void clearNewJob() {
this.newJob = false;
}
void wakeup() {
synchronized (this.mutex) {
mutex.notifyAll();
}
}
}
}