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package org.dcache.srm.request;
import com.google.common.collect.Iterables;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import javax.annotation.Nonnull;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.dcache.srm.SRMAbortedException;
import org.dcache.srm.SRMException;
import org.dcache.srm.SRMInvalidRequestException;
import org.dcache.srm.SRMReleasedException;
import org.dcache.srm.scheduler.IllegalStateTransition;
import org.dcache.srm.scheduler.JobIdGenerator;
import org.dcache.srm.scheduler.JobIdGeneratorFactory;
import org.dcache.srm.scheduler.JobStorage;
import org.dcache.srm.scheduler.JobStorageFactory;
import org.dcache.srm.scheduler.Scheduler;
import org.dcache.srm.scheduler.State;
import org.dcache.srm.util.JDC;
import org.dcache.srm.v2_2.TStatusCode;
import org.dcache.util.TimeUtils;
import org.dcache.util.TimeUtils.TimeUnitFormat;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
/**
* The base class for all scheduled activity within SRM. An instance of this
* class represents either a complete SRM operation (Request), or an individual
* file within an operation (FileRequest).
*/
public abstract class Job {
private static final Logger logger = LoggerFactory.getLogger(Job.class);
protected static final String TIMESTAMP_FORMAT = "yyyy-MM-dd' 'HH:mm:ss.SSS";
//this is used to build the queue of jobs.
protected Long nextJobId;
protected final long id;
/**
* Status code from version 2.2
* provides a better description of
* reasons for failure, etc
* need this to comply with the spec
*/
private TStatusCode statusCode;
private volatile State state = State.UNSCHEDULED;
protected String schedulerId;
protected long schedulerTimeStamp;
protected final long creationTime;
protected long lifetime;
private long lastStateTransitionTime = System.currentTimeMillis();
private final List<JobHistory> jobHistory = new ArrayList<>();
private transient JobIdGenerator generator;
private transient boolean savedInFinalState;
protected transient JDC jdc;
private final ReentrantReadWriteLock lock =
new ReentrantReadWriteLock();
// this constructor is used for restoring the job from permanent storage
// should be called through the Job.getJob only, otherwise the expireRestoredJobOrCreateExperationTimer
// will never be called
// we can not call it from the constructor, since this may lead to recursive job restoration
// leading to the exhaust of the pool of database connections
protected Job(long id, Long nextJobId, long creationTime,
long lifetime, int stateId,
String schedulerId,
long schedulerTimestamp,
int numberOfRetries,
long lastStateTransitionTime,
JobHistory[] jobHistoryArray,
String statusCodeString) {
this.id = id;
this.nextJobId = nextJobId;
this.creationTime = creationTime;
this.lifetime = lifetime;
if(state == null) {
throw new NullPointerException(" job state is null");
}
this.state = State.getState(stateId);
this.schedulerId = schedulerId;
this.schedulerTimeStamp = schedulerTimestamp;
this.lastStateTransitionTime = lastStateTransitionTime;
this.jdc = new JDC();
if(jobHistoryArray != null) {
Collections.addAll(jobHistory, jobHistoryArray);
} else {
jobHistory.add(new JobHistory(nextLong(), state, "Request restored from database", System.currentTimeMillis()));
}
this.statusCode = statusCodeString==null
?null
:TStatusCode.fromString(statusCodeString);
}
/** Creates a new instance of Job */
public Job(long lifetime) {
id = nextId();
creationTime = System.currentTimeMillis();
this.lifetime = lifetime;
this.jdc = new JDC();
jobHistory.add(new JobHistory(nextLong(), state, "Request created", lastStateTransitionTime));
}
protected JobStorage<Job> getJobStorage() {
return JobStorageFactory.getJobStorageFactory().getJobStorage(this);
}
public void saveJob() {
saveJob(false);
}
public void saveJob(boolean force) {
wlock();
try {
// by making sure that the saving of the job in final state happens
// only once
// we hope to eliminate the dubplicate key error
if(savedInFinalState){
return;
}
boolean isFinalState = this.getState().isFinal();
getJobStorage().saveJob(this, isFinalState || force);
savedInFinalState = isFinalState;
} catch (DataAccessException e) {
// if saving fails we do not want to fail the request
logger.error("Failed to save SQL request to database: {}", e.toString());
} catch (RuntimeException e) {
// if saving fails we do not want to fail the request
logger.error("Failed to save SQL request to database. Please report to support@dcache.org.", e);
} finally {
wunlock();
}
}
/**
* Return the Job (or subclass thereof). This may involve retrieving the
* information from an external storage. If the job cannot be found then
* SRMInvalidRequestException is thrown.
* <p>
* The returned type is determined by the type parameter and must be Job
* or a subclass of Job. If the job doesn't have the right type then
* SRMInvalidRequestException is thrown.
* @param id which job to fetch.
* @param type the desired class to represent this job
* @return the requested class for the job with requested id
* @throws SRMInvalidRequestException if the job cannot be found or if
* the job has the wrong type.
*/
@Nonnull
public static final <T extends Job> T getJob(long id, Class<T> type)
throws SRMInvalidRequestException
{
for (Map.Entry<Class<? extends Job>, JobStorage<?>> entry: JobStorageFactory.getJobStorageFactory().getJobStorages().entrySet()) {
if (type.isAssignableFrom(entry.getKey())) {
try {
Job job = entry.getValue().getJob(id);
if (job != null) {
return type.cast(job);
}
} catch (DataAccessException e) {
logger.error("Failed to read job", e);
}
}
}
throw new SRMInvalidRequestException("Id " + id + " does not correspond to any known job");
}
/** Performs state transition checking the legality first.
*/
public State getState() {
rlock();
try {
return state;
} finally {
runlock();
}
}
/**
* Changes the state of this job to a new state.
*/
public final void setState(State newState, String description)
throws IllegalStateTransition
{
wlock();
try {
if (newState == this.state) {
return;
}
if (!isValidTransition(this.state, newState)) {
throw new IllegalStateTransition(
"Illegal state transition from " + this.state + " to " + newState,
this.state, newState);
}
State oldState = this.state;
this.state = newState;
lastStateTransitionTime = System.currentTimeMillis();
jobHistory.add( new JobHistory(nextLong(),newState,description,lastStateTransitionTime));
notifySchedulerOfStateChange(oldState, newState);
if (!newState.isFinal() && schedulerId == null) {
throw new IllegalStateTransition("Scheduler ID is null");
}
stateChanged(oldState);
saveJob(state == State.RQUEUED);
} finally {
wunlock();
}
}
private boolean isValidTransition(State currentState, State newState)
throws IllegalStateTransition
{
switch (currentState) {
case UNSCHEDULED:
case RESTORED:
return newState == State.DONE
|| newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.QUEUED;
case QUEUED:
return newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.INPROGRESS
|| newState == State.UNSCHEDULED;
case INPROGRESS:
return newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.QUEUED
|| newState == State.RQUEUED
|| newState == State.READY
|| newState == State.DONE;
case RQUEUED:
return newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.READY;
case READY:
return newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.TRANSFERRING
|| newState == State.DONE;
case TRANSFERRING:
return newState == State.CANCELED
|| newState == State.FAILED
|| newState == State.DONE;
case FAILED:
case DONE:
case CANCELED:
return false;
}
return true;
}
/**
* Try to change the state of the job into the READY state.
*/
public void tryToReady() {
wlock();
try {
if (state == State.RQUEUED && schedulerId != null) {
Scheduler scheduler = Scheduler.getScheduler(schedulerId);
if (scheduler != null) {
scheduler.tryToReadyJob(this);
}
}
} finally {
wunlock();
}
}
/**
* Provide the latest JobHistory description. If the job is in a
* terminal error state the string should hint as to what triggered the
* failure.
* @return the String argument last supplied to addHistoryEvent.
* <p/>
* See {@link #addHistoryEvent(java.lang.String) }
*/
public String latestHistoryEvent() {
rlock();
try {
if (jobHistory.isEmpty()) {
return "initial state";
} else {
JobHistory latest = jobHistory.get(jobHistory.size() -1);
return latest.getDescription();
}
} finally {
runlock();
}
}
public void addHistoryEvent(String description){
wlock();
try {
jobHistory.add(new JobHistory(nextLong(), state, description, System.currentTimeMillis()));
} finally {
wunlock();
}
}
public CharSequence getHistory() {
return getHistory("");
}
public CharSequence getHistory(String padding) {
StringBuilder historyStringBuillder = new StringBuilder();
long previousTransitionTime = 0;
State previousTransitionState = State.UNSCHEDULED;
rlock();
try {
SimpleDateFormat format = new SimpleDateFormat(TimeUtils.TIMESTAMP_FORMAT);
for( JobHistory nextHistoryElement: jobHistory ) {
if (historyStringBuillder.length() != 0) {
appendDuration(historyStringBuillder, nextHistoryElement.getTransitionTime() -
previousTransitionTime, "").append('\n');
}
previousTransitionTime = nextHistoryElement.getTransitionTime();
historyStringBuillder.append(padding);
historyStringBuillder.append(" ").append(format
.format(new Date(nextHistoryElement.getTransitionTime())));
historyStringBuillder.append(" ").append(nextHistoryElement.getState());
historyStringBuillder.append(": ");
historyStringBuillder.append(nextHistoryElement.getDescription());
previousTransitionState = nextHistoryElement.getState();
}
} finally {
runlock();
}
if (historyStringBuillder.length() != 0) {
if (!previousTransitionState.isFinal()) {
long duration = System.currentTimeMillis() - previousTransitionTime;
appendDuration(historyStringBuillder, duration, ", so far");
}
historyStringBuillder.append('\n');
}
return historyStringBuillder;
}
private StringBuilder appendDuration(StringBuilder sb, long duration, String extra)
{
sb.append(" (").append(TimeUtils.duration(duration, MILLISECONDS, TimeUnitFormat.SHORT));
sb.append(extra);
sb.append(")");
return sb;
}
public List<JobHistory> getJobHistory() {
rlock();
try {
return new ArrayList<>(jobHistory);
} finally {
runlock();
}
}
@Nonnull
public JobHistory getLastJobChange()
{
rlock();
try {
return Iterables.getLast(jobHistory);
} finally {
runlock();
}
}
public abstract void run() throws SRMException, IllegalStateTransition;
//implementation should not block in this method
// this method should make sure that the job is saved in the
// job's storage (instance of Jon.JobStorage (possibly in a database )
protected abstract void stateChanged(State oldState);
public TStatusCode getStatusCode() {
rlock();
try {
return statusCode;
} finally {
runlock();
}
}
public void setStatusCode(TStatusCode statusCode) {
wlock();
try {
this.statusCode = statusCode;
} finally {
wunlock();
}
}
public String getStatusCodeString() {
rlock();
try {
return statusCode==null ? null:statusCode.getValue() ;
} finally {
runlock();
}
}
public void setStateAndStatusCode(
State state,
String description,
TStatusCode statusCode) throws IllegalStateTransition {
wlock();
try {
setState(state, description);
setStatusCode(statusCode);
} finally {
wunlock();
}
}
/** Getter for property id.
* @return Value of property id.
*
*/
public long getId() {
return id;
}
/** Getter for property nextJobId.
* @return Value of property nextJobId.
*
*/
public Long getNextJobId() {
rlock();
try {
return nextJobId;
} finally {
runlock();
}
}
/** Setter for property nextJobId.
* @param nextJobId New value of property nextJobId.
*
*/
public void setNextJobId(Long nextJobId) {
wlock();
try {
this.nextJobId = nextJobId;
saveJob();
} finally {
wunlock();
}
}
/** Getter for property schedulerId.
* @return Value of property schedulerId.
*
*/
public String getSchedulerId() {
rlock();
try {
return schedulerId;
} finally {
runlock();
}
}
/** Setter for property schedulerId.
* @param schedulerId New value of property schedulerId.
*
*/
public void setScheduler(String schedulerId,long schedulerTimeStamp) {
wlock() ;
try {
// check if the values have indeed changed
// If they are the same, we do not need to do anythign.
if(this.schedulerTimeStamp != schedulerTimeStamp ||
this.schedulerId != null && schedulerId == null ||
schedulerId != null && !schedulerId.equals(this.schedulerId)) {
this.schedulerTimeStamp = schedulerTimeStamp;
this.schedulerId = schedulerId;
// we need to save job every time the scheduler is set
// even if the jbbc monitoring log is disabled,
// as we use scheduler id to identify who this job belongs to.
saveJob(true);
}
} finally {
wunlock();
}
}
/** Getter for property schedulerTimeStamp.
* @return Value of property schedulerTimeStamp.
*
*/
public long getSchedulerTimeStamp() {
rlock();
try {
return schedulerTimeStamp;
} finally {
runlock();
}
}
protected long extendLifetimeMillis(long newLifetimeInMillis) throws SRMException {
wlock();
try {
if (state.isFinal()){
/* [ SRM 2.2, 5.16.2 ]
*
* h) Lifetime cannot be extended on the released files, aborted files, expired
* files, and suspended files. For example, pin lifetime cannot be extended
* after srmPutDone is requested on SURLs for srmPrepareToPut request. In
* such case, SRM_INVALID_REQUEST at the file level must be returned, and
* SRM_PARTIAL_SUCCESS or SRM_FAILURE must be returned at the request level.
*
* [ SRM 2.2, 5.16.3 ]
*
* SRM_ABORTED
* § The requested file has been aborted.
* SRM_RELEASED
* § The requested file has been released.
* SRM_INVALID_REQUEST
* § Attempt to extend pin lifetimes on TURLs that have been already expired.
*
* ----
*
* We interpret the above to mean that attempting to extend the lifetime of
* any request that is in a final state should either result in SRM_ABORTED,
* SRM_RELEASED, or SRM_INVALID_REQUEST. Specifically a request that failed
* does not cause lifetime extension to return SRM_FAILURE - SRM_FAILURE is
* only return if the lifetime extension request itself fails.
*/
switch (state) {
case CANCELED:
throw new SRMAbortedException("can't extend lifetime, job was aborted");
case DONE:
throw new SRMReleasedException("can't extend lifetime, job has finished");
case FAILED:
throw new SRMInvalidRequestException("can't extend lifetime, job has failed");
default:
throw new SRMException("can't extend lifetime, job state is " + state);
}
}
long now = System.currentTimeMillis();
long remainingLifetime = creationTime + lifetime - now;
if (remainingLifetime >= newLifetimeInMillis) {
return remainingLifetime;
}
lifetime = now + newLifetimeInMillis - creationTime;
saveJob(true);
return newLifetimeInMillis;
} finally {
wunlock();
}
}
/**
* @return the generator
*/
private JobIdGenerator getGenerator() {
if(generator == null) {
generator = JobIdGeneratorFactory.getJobIdGeneratorFactory().getJobIdGenerator();
}
return generator;
}
/**we use long values internally
*but to remain complaint with srm v1
* we use the generator's next id method
* which returns longs limited to int range
* @return next Long id
*/
private long nextId() {
return getGenerator().getNextId();
}
/**
*
* @return next long value
*/
private long nextLong() {
return getGenerator().nextLong();
}
public void checkExpiration()
{
wlock();
try {
if (creationTime + lifetime < System.currentTimeMillis() && !state.isFinal()) {
logger.info("expiring job #{}", getId());
StringBuilder sb = new StringBuilder();
sb.append("Request lifetime (");
TimeUtils.appendDuration(sb, lifetime, MILLISECONDS, TimeUnitFormat.SHORT);
sb.append(") expired.");
setState(State.FAILED, sb.toString());
}
} catch (IllegalStateTransition e) {
logger.error("Illegal state transition while expiring job: {}", e.toString());
} finally {
wunlock();
}
}
/**
* Getter for property creationTime.
* @return Value of property creationTime.
*/
public long getCreationTime() {
return creationTime;
}
/**
* Getter for property lifetime.
* @return Value of property lifetime.
*/
public long getLifetime() {
rlock();
try {
return lifetime;
} finally {
runlock();
}
}
public long getRemainingLifetime() {
rlock();
try {
if (state.isFinal()) {
return 0;
}
long remainingLifetime = creationTime + lifetime - System.currentTimeMillis();
return remainingLifetime > 0 ? remainingLifetime : 0;
} finally {
runlock();
}
}
public long getLastStateTransitionTime(){
rlock();
try {
return lastStateTransitionTime;
} finally {
runlock();
}
}
public static class JobHistory implements Comparable<JobHistory> {
private final long id;
private final State state;
private final long transitionTime;
private final String description;
private boolean saved; //false by default
public JobHistory(long id, State state, String description, long transitionTime) {
this.id = id;
this.state = state;
this.description = description.replace('\'','`');
this.transitionTime = transitionTime;
}
/**
* Getter for property state.
* @return Value of property state.
*/
public State getState() {
return state;
}
/**
* Getter for property id.
* @return Value of property id.
*/
public long getId() {
return id;
}
/**
* Getter for property transitionTime.
* @return Value of property transitionTime.
*/
public long getTransitionTime() {
return transitionTime;
}
/**
* Getter for property description.
* @return Value of property description.
*/
public String getDescription() {
return description;
}
@Override
public int compareTo(JobHistory o) {
long oTransitionTime = o.getTransitionTime();
return transitionTime < oTransitionTime?
-1:
(transitionTime == oTransitionTime? 0: 1);
}
@Override
public boolean equals(Object o) {
if(o == null || !(o instanceof JobHistory)) {
return false;
}
JobHistory jobHistory = (JobHistory) o;
return jobHistory.id == id;
}
/**
* Returns a hash code for this <code>Long</code>. The result is
* the exclusive OR of the two halves of the primitive
* <code>long</code> id of this <code>JobHistory</code>
* object. That is, the hashcode is the value of the expression:
* <blockquote><pre>
* (int)(this.getId()^(this.getId()>>>32))
* </pre></blockquote>
*
* implementation is based on <code>Long</code> implementation of
* <code>hashCode()</code>
* @return a hash code value for this object.
*/
@Override
public int hashCode() {
return (int)(id ^ (id >>> 32));
}
@Override
public String toString() {
return "JobHistory[" + new Date(transitionTime) + ',' + state + ',' + description + ']';
}
public synchronized boolean isSaved() {
return saved;
}
public synchronized void setSaved() {
this.saved = true;
}
}
public JDC applyJdc()
{
JDC current = jdc.apply();
JDC.appendToSession(String.valueOf(id));
return current;
}
public Class<? extends Job> getSchedulerType()
{
return getClass();
}
/**
* This is the initial call to schedule the job for execution
*/
public void scheduleWith(Scheduler scheduler) throws InterruptedException,
IllegalStateTransition
{
wlock();
try{
if(state != State.UNSCHEDULED) {
throw new IllegalStateException("Job " +
getClass().getSimpleName() + " [" + this.getId() +
"] has state " + state + "(not UNSCHEDULED)");
}
setScheduler(scheduler.getId(), scheduler.getTimestamp());
scheduler.queue(this);
} finally {
wunlock();
}
}
/**
* Notifies the scheduler of the this job of a change
* of the state from old to new
* @param oldState
* @param newState
*/
private void notifySchedulerOfStateChange(State oldState, State newState) {
if (schedulerId != null) {
Scheduler scheduler = Scheduler.getScheduler(schedulerId);
if (scheduler != null) {
logger.debug("notifySchedulerOfStateChange calls scheduler.stateChanged()");
scheduler.stateChanged(this, oldState, newState);
if (state.isFinal()) {
schedulerId = null;
}
}
}
}
public final void wlock() {
lock.writeLock().lock();
}
public final void wunlock() {
lock.writeLock().unlock();
}
/* Note that a read lock cannot be upgraded to a write lock. */
public final void rlock() {
lock.readLock().lock();
}
public final void runlock() {
lock.readLock().unlock();
}
@Override
public final String toString() {
return toString(false);
}
public final String toString(boolean longformat) {
StringBuilder sb = new StringBuilder();
toString(sb,longformat);
return sb.toString();
}
public abstract void toString(StringBuilder sb, boolean longformat);
/**
* Method called when the SRM is started and a job has been restored from
* some JobStorage (such as a DatabaseJobStorage) and the job is in a
* non-final state.
*/
public void onSrmRestart(Scheduler scheduler, boolean shouldFailJobs)
{
wlock();
try {
if (state.isFinal()) {
return;
}
setScheduler(scheduler.getId(), scheduler.getTimestamp());
notifySchedulerOfStateChange(State.RESTORED, state);
if (shouldFailJobs) {
setState(State.FAILED, "Aborted due to SRM service restart.");
return;
}
if (getRemainingLifetime() == 0) {
setState(State.FAILED, "Expired during SRM service restart.");
return;
}
switch (state) {
// Unscheduled or queued jobs were never worked on before the SRM restart; we
// simply queue them now.
case UNSCHEDULED:
case QUEUED:
addHistoryEvent("Restored from database.");
scheduler.queue(this);
break;
// Jobs in RQUEUED, READY or TRANSFERRING states require no further
// processing. We can leave them for the client to discover the TURL
// or place the job into the DONE state, respectively.
case RQUEUED:
case READY:
case TRANSFERRING:
break;
// Other job states need request-specific recovery process.
default:
onSrmRestartForActiveJob(scheduler);
break;
}
} catch (IllegalStateTransition e) {
logger.error("Failed to restore job: " + e.getMessage());
} finally {
wunlock();
}
}
/**
* Provide request-specific recovery for jobs that were being processed
* when SRM was restarted. This corresponds to jobs in state INPROGRESS.
*
* In general, such jobs require some request-specific procedure.
* Subclasses are expected to override this method to provide this
* procedure.
*/
protected void onSrmRestartForActiveJob(Scheduler scheduler)
throws IllegalStateTransition
{
// By default, simply fail such requests.
setState(State.FAILED, "Aborted due to SRM service restart.");
}
}