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io.nflow.engine.internal.dao.WorkflowInstanceDao Maven / Gradle / Ivy
package io.nflow.engine.internal.dao;
import static io.nflow.engine.internal.dao.DaoUtil.firstColumnLengthExtractor;
import static io.nflow.engine.internal.dao.DaoUtil.getInt;
import static io.nflow.engine.internal.dao.DaoUtil.getLong;
import static io.nflow.engine.internal.dao.DaoUtil.toTimestamp;
import static io.nflow.engine.workflow.instance.WorkflowInstance.WorkflowInstanceStatus.created;
import static io.nflow.engine.workflow.instance.WorkflowInstance.WorkflowInstanceStatus.executing;
import static io.nflow.engine.workflow.instance.WorkflowInstance.WorkflowInstanceStatus.inProgress;
import static io.nflow.engine.workflow.instance.WorkflowInstanceAction.WorkflowActionType.recovery;
import static java.lang.Math.min;
import static java.util.Collections.emptyList;
import static java.util.Collections.emptyMap;
import static java.util.Collections.sort;
import static java.util.Optional.ofNullable;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Stream.empty;
import static org.apache.commons.lang3.StringUtils.abbreviate;
import static org.apache.commons.lang3.StringUtils.join;
import static org.apache.commons.lang3.StringUtils.length;
import static org.joda.time.DateTime.now;
import static org.slf4j.LoggerFactory.getLogger;
import static org.springframework.transaction.annotation.Propagation.MANDATORY;
import static org.springframework.util.CollectionUtils.isEmpty;
import static org.springframework.util.StringUtils.collectionToDelimitedString;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Stream;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.springframework.core.env.Environment;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCreator;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.support.AbstractInterruptibleBatchPreparedStatementSetter;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Component;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
import org.springframework.util.Assert;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import io.nflow.engine.config.NFlow;
import io.nflow.engine.internal.executor.InstanceInfo;
import io.nflow.engine.internal.executor.WorkflowInstanceExecutor;
import io.nflow.engine.internal.storage.db.SQLVariants;
import io.nflow.engine.model.ModelObject;
import io.nflow.engine.service.WorkflowInstanceInclude;
import io.nflow.engine.workflow.executor.StateVariableValueTooLongException;
import io.nflow.engine.workflow.instance.QueryWorkflowInstances;
import io.nflow.engine.workflow.instance.WorkflowInstance;
import io.nflow.engine.workflow.instance.WorkflowInstance.WorkflowInstanceStatus;
import io.nflow.engine.workflow.instance.WorkflowInstanceAction;
import io.nflow.engine.workflow.instance.WorkflowInstanceAction.WorkflowActionType;
import io.nflow.engine.workflow.instance.WorkflowInstanceFactory;
/**
* Use setter injection because constructor injection may not work when nFlow is used in some legacy systems.
*/
@Component
@SuppressFBWarnings(value = "SIC_INNER_SHOULD_BE_STATIC_ANON", justification = "common jdbctemplate practice")
@Singleton
public class WorkflowInstanceDao {
private static final Logger logger = getLogger(WorkflowInstanceDao.class);
static final Map> EMPTY_ACTION_STATE_MAP = emptyMap();
private final ConcurrentMap workflowTypeByWorkflowIdCache = new ConcurrentHashMap<>();
final JdbcTemplate jdbc;
private final NamedParameterJdbcTemplate namedJdbc;
private final TransactionTemplate transaction;
final ExecutorDao executorInfo;
final SQLVariants sqlVariants;
private final WorkflowInstanceExecutor workflowInstanceExecutor;
final WorkflowInstanceFactory workflowInstanceFactory;
private final long workflowInstanceQueryMaxResults;
private final long workflowInstanceQueryMaxResultsDefault;
private final long workflowInstanceQueryMaxActions;
private final long workflowInstanceQueryMaxActionsDefault;
private final int workflowInstanceTypeCacheSize;
private boolean disableBatchUpdates;
int instanceStateTextLength;
int actionStateTextLength;
int stateVariableValueMaxLength;
@Inject
public WorkflowInstanceDao(SQLVariants sqlVariants, @NFlow JdbcTemplate nflowJdbcTemplate,
@NFlow TransactionTemplate transactionTemplate, @NFlow NamedParameterJdbcTemplate nflowNamedParameterJdbcTemplate,
ExecutorDao executorDao, WorkflowInstanceExecutor workflowInstanceExecutor, WorkflowInstanceFactory workflowInstanceFactory,
Environment env) {
this.sqlVariants = sqlVariants;
this.jdbc = nflowJdbcTemplate;
this.transaction = transactionTemplate;
this.namedJdbc = nflowNamedParameterJdbcTemplate;
this.executorInfo = executorDao;
this.workflowInstanceExecutor = workflowInstanceExecutor;
this.workflowInstanceFactory = workflowInstanceFactory;
workflowInstanceQueryMaxResults = env.getRequiredProperty("nflow.workflow.instance.query.max.results", Long.class);
workflowInstanceQueryMaxResultsDefault = env.getRequiredProperty("nflow.workflow.instance.query.max.results.default",
Long.class);
workflowInstanceQueryMaxActions = env.getRequiredProperty("nflow.workflow.instance.query.max.actions", Long.class);
workflowInstanceQueryMaxActionsDefault = env.getRequiredProperty("nflow.workflow.instance.query.max.actions.default",
Long.class);
disableBatchUpdates = env.getRequiredProperty("nflow.db.disable_batch_updates", Boolean.class);
if (disableBatchUpdates) {
logger.info("nFlow DB batch updates are disabled (system property nflow.db.disable_batch_updates=true)");
}
workflowInstanceTypeCacheSize = env.getRequiredProperty("nflow.db.workflowInstanceType.cacheSize", Integer.class);
// In one deployment, FirstColumnLengthExtractor returned 0 column length (H2), so allow explicit length setting.
instanceStateTextLength = env.getProperty("nflow.workflow.instance.state.text.length", Integer.class, -1);
actionStateTextLength = env.getProperty("nflow.workflow.action.state.text.length", Integer.class, -1);
stateVariableValueMaxLength = env.getProperty("nflow.workflow.state.variable.value.length", Integer.class, -1);
}
private int getInstanceStateTextLength() {
if (instanceStateTextLength == -1) {
instanceStateTextLength = jdbc.query("select state_text from nflow_workflow where 1 = 0", firstColumnLengthExtractor);
}
return instanceStateTextLength;
}
int getActionStateTextLength() {
if (actionStateTextLength == -1) {
actionStateTextLength = jdbc.query("select state_text from nflow_workflow_action where 1 = 0", firstColumnLengthExtractor);
}
return actionStateTextLength;
}
int getStateVariableValueMaxLength() {
if (stateVariableValueMaxLength == -1) {
stateVariableValueMaxLength = jdbc.query("select state_value from nflow_workflow_state where 1 = 0",
firstColumnLengthExtractor);
}
return stateVariableValueMaxLength;
}
public long insertWorkflowInstance(WorkflowInstance instance) {
long id;
if (sqlVariants.hasUpdateableCTE()) {
id = insertWorkflowInstanceWithCte(instance);
} else {
id = insertWorkflowInstanceWithTransaction(instance);
}
if (instance.nextActivation != null && instance.nextActivation.isBeforeNow()) {
workflowInstanceExecutor.wakeUpDispatcherIfNeeded();
}
return id;
}
private long insertWorkflowInstanceWithCte(WorkflowInstance instance) {
try {
StringBuilder sqlb = new StringBuilder(256);
sqlb.append("with wf as (").append(insertWorkflowInstanceSql()).append(" returning id)");
Object[] instanceValues = new Object[] { instance.type, instance.priority, instance.parentWorkflowId,
instance.parentActionId, instance.businessKey, instance.externalId, executorInfo.getExecutorGroup(),
instance.status.name(), instance.state, abbreviate(instance.stateText, getInstanceStateTextLength()),
toTimestamp(instance.nextActivation), instance.signal.orElse(null) };
int pos = instanceValues.length;
Object[] args = Arrays.copyOf(instanceValues, pos + instance.stateVariables.size() * 2);
for (Entry variable : instance.stateVariables.entrySet()) {
sqlb.append(", ins").append(pos).append(" as (").append(insertWorkflowInstanceStateSql())
.append(" select wf.id,0,?,? from wf)");
args[pos++] = variable.getKey();
args[pos++] = variable.getValue();
}
sqlb.append(" select wf.id from wf");
return jdbc.queryForObject(sqlb.toString(), Long.class, args);
} catch (DuplicateKeyException e) {
logger.warn("Failed to insert workflow instance", e);
return -1;
}
}
boolean useBatchUpdate() {
return !disableBatchUpdates && sqlVariants.useBatchUpdate();
}
String insertWorkflowInstanceSql() {
return "insert into nflow_workflow(type, priority, parent_workflow_id, parent_action_id, business_key, external_id, "
+ "executor_group, status, state, state_text, next_activation, workflow_signal) values (?, ?, ?, ?, ?, ?, ?, "
+ sqlVariants.workflowStatus() + ", ?, ?, ?, ?)";
}
String insertWorkflowInstanceStateSql() {
return "insert into nflow_workflow_state(workflow_id, action_id, state_key, state_value)";
}
@SuppressFBWarnings(value = { "OBL_UNSATISFIED_OBLIGATION_EXCEPTION_EDGE",
"SQL_PREPARED_STATEMENT_GENERATED_FROM_NONCONSTANT_STRING" }, justification = "findbugs does not trust jdbctemplate, sql string is practically constant")
private long insertWorkflowInstanceWithTransaction(final WorkflowInstance instance) {
return transaction.execute(status -> {
KeyHolder keyHolder = new GeneratedKeyHolder();
try {
jdbc.update((PreparedStatementCreator) connection -> {
int p = 1;
PreparedStatement ps = connection.prepareStatement(insertWorkflowInstanceSql(), new String[] { "id" });
ps.setString(p++, instance.type);
ps.setShort(p++, instance.priority);
ps.setObject(p++, instance.parentWorkflowId);
ps.setObject(p++, instance.parentActionId);
ps.setString(p++, instance.businessKey);
ps.setString(p++, instance.externalId);
ps.setString(p++, executorInfo.getExecutorGroup());
ps.setString(p++, instance.status.name());
ps.setString(p++, instance.state);
ps.setString(p++, abbreviate(instance.stateText, getInstanceStateTextLength()));
sqlVariants.setDateTime(ps, p++, instance.nextActivation);
if (instance.signal.isPresent()) {
ps.setInt(p++, instance.signal.get());
} else {
ps.setNull(p++, Types.INTEGER);
}
return ps;
}, keyHolder);
} catch (DuplicateKeyException e) {
logger.warn("Failed to insert workflow instance", e);
return -1L;
}
long id = keyHolder.getKey().longValue();
insertVariables(id, 0, instance.stateVariables);
return id;
});
}
void insertVariables(final long id, final long actionId, Map changedStateVariables) {
if (changedStateVariables.isEmpty()) {
return;
}
if (useBatchUpdate()) {
insertVariablesWithBatchUpdate(id, actionId, changedStateVariables);
} else {
insertVariablesWithMultipleUpdates(id, actionId, changedStateVariables);
}
}
private void insertVariablesWithMultipleUpdates(final long id, final long actionId, Map changedStateVariables) {
for (Entry entry : changedStateVariables.entrySet()) {
int updated = jdbc.update(insertWorkflowInstanceStateSql() + " values (?,?,?,?)", id, actionId, entry.getKey(),
entry.getValue());
if (updated != 1) {
throw new IllegalStateException("Failed to insert state variable " + entry.getKey());
}
}
}
private void insertVariablesWithBatchUpdate(final long id, final long actionId, Map changedStateVariables) {
final Iterator> variables = changedStateVariables.entrySet().iterator();
int[] updateStatus = jdbc.batchUpdate(insertWorkflowInstanceStateSql() + " values (?,?,?,?)",
new AbstractInterruptibleBatchPreparedStatementSetter() {
@Override
protected boolean setValuesIfAvailable(PreparedStatement ps, int i) throws SQLException {
if (!variables.hasNext()) {
return false;
}
Entry variable = variables.next();
ps.setLong(1, id);
ps.setLong(2, actionId);
ps.setString(3, variable.getKey());
ps.setString(4, variable.getValue());
return true;
}
});
int updatedRows = 0;
boolean unknownResults = false;
for (int i = 0; i < updateStatus.length; ++i) {
if (updateStatus[i] == Statement.SUCCESS_NO_INFO) {
unknownResults = true;
continue;
}
if (updateStatus[i] == Statement.EXECUTE_FAILED) {
throw new IllegalStateException("Failed to insert/update state variable at index " + i + " (" + updateStatus[i] + ")");
}
updatedRows += updateStatus[i];
}
int changedVariables = changedStateVariables.size();
if (!unknownResults && updatedRows != changedVariables) {
throw new IllegalStateException(
"Failed to insert/update state variables, expected update count " + changedVariables + ", actual " + updatedRows);
}
}
@SuppressWarnings("null")
public void updateWorkflowInstanceAfterExecution(WorkflowInstance instance, WorkflowInstanceAction action,
List childWorkflows, List workflows, boolean createAction) {
Assert.isTrue(action != null, "action can not be null");
Assert.isTrue(childWorkflows != null, "childWorkflows can not be null");
Assert.isTrue(workflows != null, "workflows can not be null");
Map changedStateVariables = instance.getChangedStateVariables();
if (!createAction && (!childWorkflows.isEmpty() || !workflows.isEmpty() || !changedStateVariables.isEmpty())) {
logger.info("Forcing action creation because new workflow instances are created or state variables are changed.");
createAction = true;
}
if (createAction) {
if (sqlVariants.hasUpdateableCTE() && childWorkflows.isEmpty() && workflows.isEmpty()) {
updateWorkflowInstanceWithCTE(instance, action, changedStateVariables);
} else {
updateWorkflowInstanceWithTransaction(instance, action, childWorkflows, workflows, changedStateVariables);
}
} else {
updateWorkflowInstance(instance);
}
}
public int updateWorkflowInstance(WorkflowInstance instance) {
// using sqlVariants.nextActivationUpdate() requires that nextActivation is used 3 times
Object nextActivation = sqlVariants.toTimestampObject(instance.nextActivation);
return jdbc.update(updateWorkflowInstanceSql(), instance.status.name(), instance.state,
abbreviate(instance.stateText, getInstanceStateTextLength()), nextActivation, nextActivation, nextActivation,
instance.status == executing ? executorInfo.getExecutorId() : null, instance.retries, toTimestamp(instance.started),
instance.id);
}
private void updateWorkflowInstanceWithTransaction(final WorkflowInstance instance, final WorkflowInstanceAction action,
final List childWorkflows, final List workflows,
final Map changedStateVariables) {
transaction.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus status) {
updateWorkflowInstance(instance);
long parentActionId = insertWorkflowInstanceAction(action);
insertVariables(action.workflowInstanceId, parentActionId, changedStateVariables);
for (WorkflowInstance childTemplate : childWorkflows) {
WorkflowInstance childWorkflow = new WorkflowInstance.Builder(childTemplate).setParentWorkflowId(instance.id)
.setParentActionId(parentActionId).build();
insertWorkflowInstance(childWorkflow);
}
for (WorkflowInstance workflow : workflows) {
insertWorkflowInstance(workflow);
}
}
});
}
public void recoverWorkflowInstancesFromDeadNodes() {
WorkflowInstanceAction.Builder builder = new WorkflowInstanceAction.Builder().setExecutionStart(now()).setExecutionEnd(now())
.setType(recovery).setStateText("Recovered");
for (InstanceInfo instance : getRecoverableInstances()) {
WorkflowInstanceAction action = builder.setState(instance.state).setWorkflowInstanceId(instance.id).build();
recoverWorkflowInstance(instance.id, action);
}
}
private List getRecoverableInstances() {
String sql = "select id, state from nflow_workflow where executor_id in (select id from nflow_executor where "
+ executorInfo.getExecutorGroupCondition() + " and id <> " + executorInfo.getExecutorId() + " and "
+ sqlVariants.dateLtEqDiff("expires", "current_timestamp") + ")";
return jdbc.query(sql, new RowMapper() {
@Override
public InstanceInfo mapRow(ResultSet rs, int rowNum) throws SQLException {
InstanceInfo instance = new InstanceInfo();
instance.id = rs.getLong("id");
instance.state = rs.getString("state");
return instance;
}
});
}
private void recoverWorkflowInstance(final long instanceId, final WorkflowInstanceAction action) {
transaction.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus status) {
int executorId = executorInfo.getExecutorId();
int updated = jdbc.update("update nflow_workflow set executor_id = null, status = "
+ sqlVariants.workflowStatus(inProgress) + " where id = ? and executor_id in (select id from nflow_executor where "
+ executorInfo.getExecutorGroupCondition() + " and id <> " + executorId + " and "
+ sqlVariants.dateLtEqDiff("expires", "current_timestamp") + ")", instanceId);
if (updated > 0) {
insertWorkflowInstanceAction(action);
}
}
});
}
private void updateWorkflowInstanceWithCTE(WorkflowInstance instance, final WorkflowInstanceAction action,
Map changedStateVariables) {
int executorId = executorInfo.getExecutorId();
StringBuilder sqlb = new StringBuilder(256);
sqlb.append("with wf as (").append(updateWorkflowInstanceSql()).append(" returning id), ");
sqlb.append("act as (").append(insertWorkflowActionSql()).append(" select wf.id, ?, ").append(sqlVariants.actionType())
.append(", ?, ?, ?, ?, ? from wf returning id)");
// using sqlVariants.nextActivationUpdate() requires that nextActivation is added 3 times
Timestamp nextActivation = toTimestamp(instance.nextActivation);
Object[] fixedValues = new Object[] { instance.status.name(), instance.state,
abbreviate(instance.stateText, getInstanceStateTextLength()), nextActivation, nextActivation, nextActivation,
instance.status == executing ? executorId : null, instance.retries, toTimestamp(action.executionStart), instance.id,
executorId, action.type.name(), action.state, abbreviate(action.stateText, getActionStateTextLength()), action.retryNo,
toTimestamp(action.executionStart), toTimestamp(action.executionEnd) };
int pos = fixedValues.length;
Object[] args = Arrays.copyOf(fixedValues, pos + changedStateVariables.size() * 2);
for (Entry variable : changedStateVariables.entrySet()) {
sqlb.append(", ins").append(pos).append(" as (").append(insertWorkflowInstanceStateSql())
.append(" select wf.id,act.id,?,? from wf,act)");
args[pos++] = variable.getKey();
args[pos++] = variable.getValue();
}
sqlb.append(" select act.id from act");
jdbc.queryForObject(sqlb.toString(), Long.class, args);
}
public void checkStateVariableValueLength(String name, String value) {
if (length(value) > getStateVariableValueMaxLength()) {
throw new StateVariableValueTooLongException("Too long value (length = " + length(value) + ") for state variable " + name
+ ": maximum allowed length is " + getStateVariableValueMaxLength());
}
}
String insertWorkflowActionSql() {
return "insert into nflow_workflow_action(workflow_id, executor_id, type, state, state_text, retry_no, execution_start, execution_end)";
}
private String updateWorkflowInstanceSql() {
return "update nflow_workflow set status = " + sqlVariants.workflowStatus() + ", state = ?, state_text = ?, "
+ "next_activation = " + sqlVariants.nextActivationUpdate()
+ ", external_next_activation = null, executor_id = ?, retries = ?, "
+ "started = (case when started is null then ? else started end) where id = ? and executor_id = "
+ executorInfo.getExecutorId();
}
public boolean updateNotRunningWorkflowInstance(WorkflowInstance instance) {
List vars = new ArrayList<>();
List args = new ArrayList<>();
if (instance.state != null) {
vars.add("state = ?, retries = 0");
args.add(instance.state);
}
if (instance.stateText != null) {
vars.add("state_text = ?");
args.add(instance.stateText);
}
if (instance.nextActivation != null) {
vars.add("next_activation = ?");
args.add(sqlVariants.toTimestampObject(instance.nextActivation));
}
if (instance.status != null) {
vars.add("status = " + sqlVariants.workflowStatus());
args.add(instance.status.name());
}
String sql = "update nflow_workflow set " + join(vars, ", ") + " where id = ? and executor_id is null";
args.add(instance.id);
return jdbc.update(sql, args.toArray()) == 1;
}
public boolean wakeUpWorkflowExternally(long workflowInstanceId, List expectedStates) {
StringBuilder sql = new StringBuilder("update nflow_workflow set next_activation = (case when executor_id is null then ")
.append("case when ").append(sqlVariants.dateLtEqDiff("next_activation", "current_timestamp"))
.append(" then next_activation else current_timestamp end else next_activation end), ")
.append("external_next_activation = current_timestamp where ").append(executorInfo.getExecutorGroupCondition())
.append(" and id = ? and next_activation is not null");
return addExpectedStatesToQueryAndUpdate(sql, workflowInstanceId, expectedStates);
}
public boolean wakeupWorkflowInstanceIfNotExecuting(long workflowInstanceId, List expectedStates) {
StringBuilder sql = new StringBuilder("update nflow_workflow set next_activation = current_timestamp")
.append(" where id = ? and executor_id is null and status in (").append(sqlVariants.workflowStatus(inProgress))
.append(", ").append(sqlVariants.workflowStatus(created))
.append(") and (next_activation is null or next_activation > current_timestamp)");
return addExpectedStatesToQueryAndUpdate(sql, workflowInstanceId, expectedStates);
}
private boolean addExpectedStatesToQueryAndUpdate(StringBuilder sql, long workflowInstanceId, List expectedStates) {
Object[] args = new Object[1 + expectedStates.size()];
args[0] = workflowInstanceId;
if (!expectedStates.isEmpty()) {
sql.append(" and state in (");
for (int i = 0; i < expectedStates.size(); i++) {
sql.append("?,");
args[i + 1] = expectedStates.get(i);
}
sql.setCharAt(sql.length() - 1, ')');
}
return jdbc.update(sql.toString(), args) == 1;
}
public WorkflowInstance getWorkflowInstance(long id, Set includes, Long maxActions) {
String sql = "select * from nflow_workflow where id = ?";
WorkflowInstance instance = jdbc.queryForObject(sql, new WorkflowInstanceRowMapper(), id).build();
if (includes.contains(WorkflowInstanceInclude.CURRENT_STATE_VARIABLES)) {
fillState(instance);
}
if (includes.contains(WorkflowInstanceInclude.CHILD_WORKFLOW_IDS)) {
fillChildWorkflowIds(instance);
}
if (includes.contains(WorkflowInstanceInclude.ACTIONS)) {
fillActions(instance, includes.contains(WorkflowInstanceInclude.ACTION_STATE_VARIABLES), maxActions);
}
return instance;
}
private void fillState(final WorkflowInstance instance) {
jdbc.query("select outside.state_key, outside.state_value from nflow_workflow_state outside inner join "
+ "(select workflow_id, max(action_id) action_id, state_key from nflow_workflow_state where workflow_id = ? group by workflow_id, state_key) inside "
+ "on outside.workflow_id = inside.workflow_id and outside.action_id = inside.action_id and outside.state_key = inside.state_key",
rs -> {
instance.stateVariables.put(rs.getString(1), rs.getString(2));
}, instance.id);
instance.originalStateVariables.putAll(instance.stateVariables);
}
public List pollNextWorkflowInstanceIds(final int batchSize) {
if (sqlVariants.hasUpdateReturning()) {
return pollNextWorkflowInstanceIdsWithUpdateReturning(batchSize);
}
return pollNextWorkflowInstanceIdsWithTransaction(batchSize);
}
String updateInstanceForExecutionQuery() {
return "update nflow_workflow set executor_id = " + executorInfo.getExecutorId() + ", status = "
+ sqlVariants.workflowStatus(executing) + ", " + "external_next_activation = null";
}
String whereConditionForInstanceUpdate() {
return "where executor_id is null and status in (" + sqlVariants.workflowStatus(created) + ", "
+ sqlVariants.workflowStatus(inProgress) + ") and " + sqlVariants.dateLtEqDiff("next_activation", "current_timestamp")
+ " and " + executorInfo.getExecutorGroupCondition() + " order by priority desc, next_activation asc";
}
private List pollNextWorkflowInstanceIdsWithUpdateReturning(int batchSize) {
String sql = updateInstanceForExecutionQuery() + " where id in ("
+ sqlVariants.limit(
"select id from nflow_workflow " + sqlVariants.withUpdateSkipLocked() + whereConditionForInstanceUpdate(), batchSize)
+ sqlVariants.forUpdateSkipLocked() + ") and executor_id is null returning id";
return jdbc.queryForList(sql, Long.class);
}
private List pollNextWorkflowInstanceIdsWithTransaction(final int batchSize) {
String sql = sqlVariants.limit("select id, modified from nflow_workflow " + whereConditionForInstanceUpdate(), batchSize);
List instances = transaction.execute(
tx -> jdbc.query(sql, (rs, rowNum) -> new OptimisticLockKey(rs.getLong("id"), sqlVariants.getTimestamp(rs, "modified"))));
if (instances.isEmpty()) {
return emptyList();
}
sort(instances);
List ids = transaction.execute(transactionStatus -> {
if (useBatchUpdate()) {
return updateNextWorkflowInstancesWithBatchUpdate(instances);
}
return updateNextWorkflowInstancesWithMultipleUpdates(instances);
});
if (ids.isEmpty()) {
throw new PollingRaceConditionException(
"None of the workflow instances selected for processing were successfully reserved for this executor, trying again later.");
}
return ids;
}
private List updateNextWorkflowInstancesWithMultipleUpdates(List instances) {
String sql = updateInstanceForExecutionQuery() + " where id = ? and modified = ? and executor_id is null";
return instances.stream()
.flatMap(instance -> jdbc.update(sql, instance.id, sqlVariants.tuneTimestampForDb(instance.modified)) == 1
? Stream.of(instance.id)
: empty())
.collect(toList());
}
private List updateNextWorkflowInstancesWithBatchUpdate(List instances) {
String sql = updateInstanceForExecutionQuery() + " where id = ? and modified = ? and executor_id is null";
List batchArgs = instances.stream()
.map(instance -> new Object[] { instance.id, sqlVariants.tuneTimestampForDb(instance.modified) }).collect(toList());
int[] updateStatuses = jdbc.batchUpdate(sql, batchArgs);
List ids = new ArrayList<>(instances.size());
for (int i = 0; i < updateStatuses.length; ++i) {
int status = updateStatuses[i];
if (status == 1) {
ids.add(instances.get(i).id);
} else if (status != 0) {
disableBatchUpdates = true;
throw new PollingBatchException(
"Database was unable to provide information about affected rows in a batch update. Disabling batch updates.");
}
}
return ids;
}
private static class OptimisticLockKey extends ModelObject implements Comparable {
public final long id;
public final Object modified;
public OptimisticLockKey(long id, Object modified) {
this.id = id;
this.modified = modified;
}
@Override
@SuppressFBWarnings(value = "EQ_COMPARETO_USE_OBJECT_EQUALS", justification = "This class has a natural ordering that is inconsistent with equals")
public int compareTo(OptimisticLockKey other) {
return Long.compare(this.id, other.id);
}
}
public List queryWorkflowInstances(QueryWorkflowInstances query) {
return queryWorkflowInstancesAsStream(query).collect(toList());
}
public Stream queryWorkflowInstancesAsStream(QueryWorkflowInstances query) {
String sql = "select * from nflow_workflow ";
List conditions = new ArrayList<>();
MapSqlParameterSource params = new MapSqlParameterSource();
conditions.add(executorInfo.getExecutorGroupCondition());
if (!isEmpty(query.ids)) {
conditions.add("id in (:ids)");
params.addValue("ids", query.ids);
}
if (!isEmpty(query.types)) {
conditions.add("type in (:types)");
params.addValue("types", query.types);
}
if (query.parentWorkflowId != null) {
conditions.add("parent_workflow_id = :parent_workflow_id");
params.addValue("parent_workflow_id", query.parentWorkflowId);
}
if (query.parentActionId != null) {
conditions.add("parent_action_id = :parent_action_id");
params.addValue("parent_action_id", query.parentActionId);
}
if (!isEmpty(query.states)) {
conditions.add("state in (:states)");
params.addValue("states", query.states);
}
if (!isEmpty(query.statuses)) {
List convertedStatuses = query.statuses.stream().map(WorkflowInstanceStatus::name).collect(toList());
conditions.add("status" + sqlVariants.castToText() + " in (:statuses)");
params.addValue("statuses", convertedStatuses);
}
if (query.businessKey != null) {
conditions.add("business_key = :business_key");
params.addValue("business_key", query.businessKey);
}
if (query.externalId != null) {
conditions.add("external_id = :external_id");
params.addValue("external_id", query.externalId);
}
conditions.add("executor_group = :executor_group");
params.addValue("executor_group", executorInfo.getExecutorGroup());
sql += " where " + collectionToDelimitedString(conditions, " and ") + " order by id desc";
sql = sqlVariants.limit(sql, getMaxResults(query.maxResults));
Stream ret = namedJdbc.query(sql, params, new WorkflowInstanceRowMapper()).stream()
.map(WorkflowInstance.Builder::build);
if (query.includeCurrentStateVariables) {
ret = ret.peek(instance -> fillState(instance));
}
if (query.includeActions) {
ret = ret.peek(instance -> fillActions(instance, query.includeActionStateVariables, query.maxActions));
}
if (query.includeChildWorkflows) {
ret = ret.peek(instance -> fillChildWorkflowIds(instance));
}
return ret;
}
private void fillChildWorkflowIds(final WorkflowInstance instance) {
jdbc.query("select parent_action_id, id from nflow_workflow where parent_workflow_id = ?", rs -> {
long parentActionId = rs.getLong(1);
long childWorkflowInstanceId = rs.getLong(2);
List children = instance.childWorkflows.computeIfAbsent(parentActionId, k -> new ArrayList<>());
children.add(childWorkflowInstanceId);
}, instance.id);
}
private long getMaxResults(Long maxResults) {
if (maxResults == null) {
return workflowInstanceQueryMaxResultsDefault;
}
return min(maxResults, workflowInstanceQueryMaxResults);
}
private void fillActions(WorkflowInstance instance, boolean includeStateVariables, Long requestedMaxActions) {
long maxActions = getMaxActions(requestedMaxActions);
String sql = sqlVariants
.limit("select nflow_workflow_action.* from nflow_workflow_action where workflow_id = ? order by id desc", maxActions);
List actionBuilders = jdbc.query(sql, new WorkflowInstanceActionRowMapper(sqlVariants),
instance.id);
if (includeStateVariables) {
Map> actionStates = fetchActionStateVariables(instance, actionBuilders.size(), maxActions);
actionBuilders.forEach(builder -> {
Map actionState = actionStates.get(builder.getId());
if (actionState != null) {
builder.setUpdatedStateVariables(actionState);
}
});
}
actionBuilders.stream().map(WorkflowInstanceAction.Builder::build).forEach(instance.actions::add);
}
private long getMaxActions(Long maxActions) {
if (maxActions == null) {
return workflowInstanceQueryMaxActionsDefault;
}
return min(maxActions, workflowInstanceQueryMaxActions);
}
private Map> fetchActionStateVariables(WorkflowInstance instance, long actions, long maxActions) {
String sql;
if (actions < maxActions) {
sql = "select * from nflow_workflow_state where workflow_id = ? order by action_id, state_key asc";
} else {
sql = "select nflow_workflow_state.* from ("
+ sqlVariants.limit("select id from nflow_workflow_action where workflow_id = ? order by id desc", maxActions)
+ ") action_id inner join nflow_workflow_state on action_id.id = nflow_workflow_state.action_id "
+ "order by nflow_workflow_state.action_id, nflow_workflow_state.state_key asc";
}
return jdbc.query(sql, new WorkflowActionStateRowMapper(), instance.id);
}
@Transactional(propagation = MANDATORY)
public long insertWorkflowInstanceAction(final WorkflowInstance instance, final WorkflowInstanceAction action) {
long actionId = insertWorkflowInstanceAction(action);
insertVariables(action.workflowInstanceId, actionId, instance.getChangedStateVariables());
return actionId;
}
public long insertWorkflowInstanceAction(final WorkflowInstanceAction action) {
KeyHolder keyHolder = new GeneratedKeyHolder();
jdbc.update(new PreparedStatementCreator() {
@Override
@SuppressFBWarnings(value = { "OBL_UNSATISFIED_OBLIGATION_EXCEPTION_EDGE",
"SQL_PREPARED_STATEMENT_GENERATED_FROM_NONCONSTANT_STRING" }, justification = "findbugs does not trust jdbctemplate, sql string is practically constant")
public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
PreparedStatement p = con.prepareStatement(
insertWorkflowActionSql() + " values (?, ?, " + sqlVariants.actionType() + ", ?, ?, ?, ?, ?)", new String[] { "id" });
int field = 1;
p.setLong(field++, action.workflowInstanceId);
p.setInt(field++, executorInfo.getExecutorId());
p.setString(field++, action.type.name());
p.setString(field++, action.state);
p.setString(field++, abbreviate(action.stateText, getActionStateTextLength()));
p.setInt(field++, action.retryNo);
sqlVariants.setDateTime(p, field++, action.executionStart);
sqlVariants.setDateTime(p, field++, action.executionEnd);
return p;
}
}, keyHolder);
return keyHolder.getKey().longValue();
}
public String getWorkflowInstanceState(long workflowInstanceId) {
return jdbc.queryForObject("select state from nflow_workflow where id = ?", String.class, workflowInstanceId);
}
class WorkflowInstanceRowMapper implements RowMapper {
@Override
public WorkflowInstance.Builder mapRow(ResultSet rs, int rowNum) throws SQLException {
return workflowInstanceFactory.newWorkflowInstanceBuilder() //
.setId(rs.getLong("id")) //
.setExecutorId(getInt(rs, "executor_id")) //
.setParentWorkflowId(getLong(rs, "parent_workflow_id")) //
.setParentActionId(getLong(rs, "parent_action_id")) //
.setStatus(WorkflowInstanceStatus.valueOf(rs.getString("status"))) //
.setType(rs.getString("type")) //
.setPriority(rs.getShort("priority")) //
.setBusinessKey(rs.getString("business_key")) //
.setExternalId(rs.getString("external_id")) //
.setState(rs.getString("state")) //
.setStateText(rs.getString("state_text")) //
.setActions(new ArrayList()) //
.setNextActivation(sqlVariants.getDateTime(rs, "next_activation")) //
.setRetries(rs.getInt("retries")) //
.setCreated(sqlVariants.getDateTime(rs, "created")) //
.setModified(sqlVariants.getDateTime(rs, "modified")) //
.setStartedIfNotSet(sqlVariants.getDateTime(rs, "started")) //
.setExecutorGroup(rs.getString("executor_group")) //
.setSignal(ofNullable(getInt(rs, "workflow_signal")));
}
}
static class WorkflowInstanceActionRowMapper implements RowMapper {
private final SQLVariants sqlVariants;
public WorkflowInstanceActionRowMapper(SQLVariants sqlVariants) {
this.sqlVariants = sqlVariants;
}
@Override
public WorkflowInstanceAction.Builder mapRow(ResultSet rs, int rowNum) throws SQLException {
return new WorkflowInstanceAction.Builder() //
.setId(rs.getLong("id")) //
.setWorkflowInstanceId(rs.getLong("workflow_id")) //
.setExecutorId(rs.getInt("executor_id")) //
.setType(WorkflowActionType.valueOf(rs.getString("type"))) //
.setState(rs.getString("state")) //
.setStateText(rs.getString("state_text")) //
.setRetryNo(rs.getInt("retry_no")) //
.setExecutionStart(sqlVariants.getDateTime(rs, "execution_start")) //
.setExecutionEnd(sqlVariants.getDateTime(rs, "execution_end"));
}
}
static class WorkflowActionStateRowMapper implements ResultSetExtractor>> {
private final Map> actionStates = new LinkedHashMap<>();
@Override
public Map> extractData(ResultSet rs) throws SQLException {
while (rs.next()) {
long actionId = rs.getLong("action_id");
String stateKey = rs.getString("state_key");
String stateValue = rs.getString("state_value");
actionStates.computeIfAbsent(actionId, k -> new LinkedHashMap<>()).put(stateKey, stateValue);
}
return actionStates;
}
}
public Optional getSignal(long workflowInstanceId) {
return ofNullable(
jdbc.queryForObject("select workflow_signal from nflow_workflow where id = ?", Integer.class, workflowInstanceId));
}
@Transactional
public boolean setSignal(long workflowInstanceId, Optional signal, String reason, WorkflowActionType actionType) {
boolean updated = jdbc.update("update nflow_workflow set workflow_signal = ? where id = ?", signal.orElse(null),
workflowInstanceId) > 0;
if (updated) {
DateTime now = DateTime.now();
WorkflowInstanceAction action = new WorkflowInstanceAction.Builder() //
.setWorkflowInstanceId(workflowInstanceId) //
.setExecutionStart(now) //
.setExecutionEnd(now) //
.setState(getWorkflowInstanceState(workflowInstanceId)) //
.setStateText(reason) //
.setType(actionType).build();
insertWorkflowInstanceAction(action);
}
return updated;
}
public String getWorkflowInstanceType(long workflowInstanceId) {
String type = workflowTypeByWorkflowIdCache.computeIfAbsent(workflowInstanceId,
id -> jdbc.queryForObject("select type from nflow_workflow where id = ?", String.class, id).intern());
if (workflowTypeByWorkflowIdCache.size() > workflowInstanceTypeCacheSize) {
workflowTypeByWorkflowIdCache.clear();
}
return type;
}
}
