Prevent race condition when flow transition is not initialized
Resolves #4092
This commit is contained in:
Taeik Lim
committed by
Mahmoud Ben Hassine
Mahmoud Ben Hassine
parent
f42f1ddd5e
commit
b736cd4e28
@@ -1,328 +1,332 @@
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/*
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* Copyright 2006-2014 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.batch.core.job.flow.support;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeSet;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.batch.core.Step;
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import org.springframework.batch.core.StepExecution;
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import org.springframework.batch.core.job.flow.Flow;
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import org.springframework.batch.core.job.flow.FlowExecution;
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import org.springframework.batch.core.job.flow.FlowExecutionException;
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import org.springframework.batch.core.job.flow.FlowExecutionStatus;
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import org.springframework.batch.core.job.flow.FlowExecutor;
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import org.springframework.batch.core.job.flow.State;
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import org.springframework.beans.factory.InitializingBean;
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/**
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* A {@link Flow} that branches conditionally depending on the exit status of
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* the last {@link State}. The input parameters are the state transitions (in no
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* particular order). The start state name can be specified explicitly (and must
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* exist in the set of transitions), or computed from the existing transitions,
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* if unambiguous.
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*
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* @author Dave Syer
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* @author Michael Minella
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* @since 2.0
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*/
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public class SimpleFlow implements Flow, InitializingBean {
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private static final Log logger = LogFactory.getLog(SimpleFlow.class);
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private State startState;
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private Map<String, Set<StateTransition>> transitionMap = new HashMap<>();
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private Map<String, State> stateMap = new HashMap<>();
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private List<StateTransition> stateTransitions = new ArrayList<>();
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private final String name;
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private Comparator<StateTransition> stateTransitionComparator;
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public void setStateTransitionComparator(Comparator<StateTransition> stateTransitionComparator) {
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this.stateTransitionComparator = stateTransitionComparator;
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}
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/**
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* Create a flow with the given name.
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*
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* @param name the name of the flow
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*/
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public SimpleFlow(String name) {
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this.name = name;
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}
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public State getStartState() {
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return this.startState;
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}
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/**
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* Get the name for this flow.
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*
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* @see Flow#getName()
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*/
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@Override
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public String getName() {
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return name;
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}
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/**
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* Public setter for the stateTransitions.
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*
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* @param stateTransitions the stateTransitions to set
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*/
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public void setStateTransitions(List<StateTransition> stateTransitions) {
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this.stateTransitions = stateTransitions;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public State getState(String stateName) {
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return stateMap.get(stateName);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public Collection<State> getStates() {
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return new HashSet<>(stateMap.values());
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}
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/**
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* Locate start state and pre-populate data structures needed for execution.
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*
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* @see InitializingBean#afterPropertiesSet()
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*/
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@Override
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public void afterPropertiesSet() throws Exception {
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if (startState == null) {
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initializeTransitions();
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}
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}
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/**
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* @see Flow#start(FlowExecutor)
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*/
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@Override
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public FlowExecution start(FlowExecutor executor) throws FlowExecutionException {
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if (startState == null) {
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initializeTransitions();
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}
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State state = startState;
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String stateName = state.getName();
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return resume(stateName, executor);
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}
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/**
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* @see Flow#resume(String, FlowExecutor)
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*/
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@Override
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public FlowExecution resume(String stateName, FlowExecutor executor) throws FlowExecutionException {
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FlowExecutionStatus status = FlowExecutionStatus.UNKNOWN;
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State state = stateMap.get(stateName);
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if (logger.isDebugEnabled()) {
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logger.debug("Resuming state="+stateName+" with status="+status);
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}
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StepExecution stepExecution = null;
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// Terminate if there are no more states
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while (isFlowContinued(state, status, stepExecution)) {
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stateName = state.getName();
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try {
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if (logger.isDebugEnabled()) {
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logger.debug("Handling state="+stateName);
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}
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status = state.handle(executor);
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stepExecution = executor.getStepExecution();
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}
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catch (FlowExecutionException e) {
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executor.close(new FlowExecution(stateName, status));
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throw e;
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}
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catch (Exception e) {
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executor.close(new FlowExecution(stateName, status));
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throw new FlowExecutionException(String.format("Ended flow=%s at state=%s with exception", name,
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stateName), e);
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}
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if (logger.isDebugEnabled()) {
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logger.debug("Completed state="+stateName+" with status="+status);
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}
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state = nextState(stateName, status, stepExecution);
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}
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FlowExecution result = new FlowExecution(stateName, status);
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executor.close(result);
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return result;
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}
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protected Map<String, Set<StateTransition>> getTransitionMap() {
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return transitionMap;
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}
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protected Map<String, State> getStateMap() {
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return stateMap;
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}
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/**
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* @param stateName the name of the next state.
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* @param status {@link FlowExecutionStatus} instance.
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* @param stepExecution {@link StepExecution} instance.
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* @return the next {@link Step} (or null if this is the end)
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* @throws FlowExecutionException thrown if error occurs during nextState processing.
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*/
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protected State nextState(String stateName, FlowExecutionStatus status, StepExecution stepExecution) throws FlowExecutionException {
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Set<StateTransition> set = transitionMap.get(stateName);
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if (set == null) {
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throw new FlowExecutionException(String.format("No transitions found in flow=%s for state=%s", getName(),
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stateName));
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}
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String next = null;
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String exitCode = status.getName();
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for (StateTransition stateTransition : set) {
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if (stateTransition.matches(exitCode) || (exitCode.equals("PENDING") && stateTransition.matches("STOPPED"))) {
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if (stateTransition.isEnd()) {
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// End of job
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return null;
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}
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next = stateTransition.getNext();
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break;
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}
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}
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if (next == null) {
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throw new FlowExecutionException(String.format("Next state not found in flow=%s for state=%s with exit status=%s", getName(), stateName, status.getName()));
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}
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if (!stateMap.containsKey(next)) {
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throw new FlowExecutionException(String.format("Next state not specified in flow=%s for next=%s",
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getName(), next));
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}
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return stateMap.get(next);
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}
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protected boolean isFlowContinued(State state, FlowExecutionStatus status, StepExecution stepExecution) {
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boolean continued = true;
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continued = state != null && status!=FlowExecutionStatus.STOPPED;
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if(stepExecution != null) {
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Boolean reRun = (Boolean) stepExecution.getExecutionContext().get("batch.restart");
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Boolean executed = (Boolean) stepExecution.getExecutionContext().get("batch.executed");
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if((executed == null || !executed) && reRun != null && reRun && status == FlowExecutionStatus.STOPPED && !state.getName().endsWith(stepExecution.getStepName()) ) {
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continued = true;
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}
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}
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return continued;
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}
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private boolean stateNameEndsWithStepName(State state, StepExecution stepExecution) {
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return !(stepExecution == null || state == null) && !state.getName().endsWith(stepExecution.getStepName());
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}
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/**
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* Analyse the transitions provided and generate all the information needed
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* to execute the flow.
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*/
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private void initializeTransitions() {
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startState = null;
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transitionMap.clear();
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stateMap.clear();
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boolean hasEndStep = false;
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if (stateTransitions.isEmpty()) {
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throw new IllegalArgumentException("No start state was found. You must specify at least one step in a job.");
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}
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for (StateTransition stateTransition : stateTransitions) {
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State state = stateTransition.getState();
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String stateName = state.getName();
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stateMap.put(stateName, state);
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}
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for (StateTransition stateTransition : stateTransitions) {
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State state = stateTransition.getState();
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if (!stateTransition.isEnd()) {
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String next = stateTransition.getNext();
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if (!stateMap.containsKey(next)) {
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throw new IllegalArgumentException("Missing state for [" + stateTransition + "]");
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}
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}
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else {
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hasEndStep = true;
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}
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String name = state.getName();
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Set<StateTransition> set = transitionMap.get(name);
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if (set == null) {
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// If no comparator is provided, we will maintain the order of insertion
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if(stateTransitionComparator == null) {
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set = new LinkedHashSet<>();
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} else {
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set = new TreeSet<>(stateTransitionComparator);
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}
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transitionMap.put(name, set);
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}
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set.add(stateTransition);
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}
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if (!hasEndStep) {
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throw new IllegalArgumentException(
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"No end state was found. You must specify at least one transition with no next state.");
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}
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startState = stateTransitions.get(0).getState();
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}
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}
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/*
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* Copyright 2006-2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.batch.core.job.flow.support;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeSet;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.batch.core.Step;
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import org.springframework.batch.core.StepExecution;
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import org.springframework.batch.core.job.flow.Flow;
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import org.springframework.batch.core.job.flow.FlowExecution;
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import org.springframework.batch.core.job.flow.FlowExecutionException;
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import org.springframework.batch.core.job.flow.FlowExecutionStatus;
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import org.springframework.batch.core.job.flow.FlowExecutor;
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import org.springframework.batch.core.job.flow.State;
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import org.springframework.beans.factory.InitializingBean;
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/**
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* A {@link Flow} that branches conditionally depending on the exit status of
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* the last {@link State}. The input parameters are the state transitions (in no
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* particular order). The start state name can be specified explicitly (and must
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* exist in the set of transitions), or computed from the existing transitions,
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* if unambiguous.
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*
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* @author Dave Syer
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* @author Michael Minella
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* @author Taeik Lim
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* @since 2.0
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*/
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public class SimpleFlow implements Flow, InitializingBean {
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private static final Log logger = LogFactory.getLog(SimpleFlow.class);
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private State startState;
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private Map<String, Set<StateTransition>> transitionMap = new HashMap<>();
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private Map<String, State> stateMap = new HashMap<>();
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private List<StateTransition> stateTransitions = new ArrayList<>();
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private final String name;
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private Comparator<StateTransition> stateTransitionComparator;
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public void setStateTransitionComparator(Comparator<StateTransition> stateTransitionComparator) {
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this.stateTransitionComparator = stateTransitionComparator;
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}
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/**
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* Create a flow with the given name.
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*
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* @param name the name of the flow
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*/
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public SimpleFlow(String name) {
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this.name = name;
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}
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public State getStartState() {
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return this.startState;
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}
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/**
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* Get the name for this flow.
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*
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* @see Flow#getName()
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*/
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@Override
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public String getName() {
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return name;
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}
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/**
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* Public setter for the stateTransitions.
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*
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* @param stateTransitions the stateTransitions to set
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*/
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public void setStateTransitions(List<StateTransition> stateTransitions) {
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this.stateTransitions = stateTransitions;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public State getState(String stateName) {
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return stateMap.get(stateName);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public Collection<State> getStates() {
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return new HashSet<>(stateMap.values());
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}
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/**
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* Locate start state and pre-populate data structures needed for execution.
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*
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* @see InitializingBean#afterPropertiesSet()
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*/
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@Override
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public void afterPropertiesSet() throws Exception {
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initializeTransitionsIfNotInitialized();
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}
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/**
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* @see Flow#start(FlowExecutor)
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*/
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@Override
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public FlowExecution start(FlowExecutor executor) throws FlowExecutionException {
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initializeTransitionsIfNotInitialized();
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State state = startState;
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String stateName = state.getName();
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return resume(stateName, executor);
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}
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/**
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* @see Flow#resume(String, FlowExecutor)
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*/
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@Override
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public FlowExecution resume(String stateName, FlowExecutor executor) throws FlowExecutionException {
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FlowExecutionStatus status = FlowExecutionStatus.UNKNOWN;
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State state = stateMap.get(stateName);
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if (logger.isDebugEnabled()) {
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logger.debug("Resuming state="+stateName+" with status="+status);
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}
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StepExecution stepExecution = null;
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// Terminate if there are no more states
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while (isFlowContinued(state, status, stepExecution)) {
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stateName = state.getName();
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try {
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if (logger.isDebugEnabled()) {
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logger.debug("Handling state="+stateName);
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}
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status = state.handle(executor);
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stepExecution = executor.getStepExecution();
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}
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catch (FlowExecutionException e) {
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executor.close(new FlowExecution(stateName, status));
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throw e;
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}
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catch (Exception e) {
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executor.close(new FlowExecution(stateName, status));
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throw new FlowExecutionException(String.format("Ended flow=%s at state=%s with exception", name,
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stateName), e);
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}
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if (logger.isDebugEnabled()) {
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logger.debug("Completed state="+stateName+" with status="+status);
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}
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state = nextState(stateName, status, stepExecution);
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}
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FlowExecution result = new FlowExecution(stateName, status);
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executor.close(result);
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return result;
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}
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protected Map<String, Set<StateTransition>> getTransitionMap() {
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return transitionMap;
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}
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protected Map<String, State> getStateMap() {
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return stateMap;
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}
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/**
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* @param stateName the name of the next state.
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* @param status {@link FlowExecutionStatus} instance.
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* @param stepExecution {@link StepExecution} instance.
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* @return the next {@link Step} (or null if this is the end)
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* @throws FlowExecutionException thrown if error occurs during nextState processing.
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*/
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protected State nextState(String stateName, FlowExecutionStatus status, StepExecution stepExecution) throws FlowExecutionException {
|
||||
Set<StateTransition> set = transitionMap.get(stateName);
|
||||
|
||||
if (set == null) {
|
||||
throw new FlowExecutionException(String.format("No transitions found in flow=%s for state=%s", getName(),
|
||||
stateName));
|
||||
}
|
||||
|
||||
String next = null;
|
||||
String exitCode = status.getName();
|
||||
|
||||
for (StateTransition stateTransition : set) {
|
||||
if (stateTransition.matches(exitCode) || (exitCode.equals("PENDING") && stateTransition.matches("STOPPED"))) {
|
||||
if (stateTransition.isEnd()) {
|
||||
// End of job
|
||||
return null;
|
||||
}
|
||||
next = stateTransition.getNext();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (next == null) {
|
||||
throw new FlowExecutionException(String.format("Next state not found in flow=%s for state=%s with exit status=%s", getName(), stateName, status.getName()));
|
||||
}
|
||||
|
||||
if (!stateMap.containsKey(next)) {
|
||||
throw new FlowExecutionException(String.format("Next state not specified in flow=%s for next=%s",
|
||||
getName(), next));
|
||||
}
|
||||
|
||||
return stateMap.get(next);
|
||||
|
||||
}
|
||||
|
||||
protected boolean isFlowContinued(State state, FlowExecutionStatus status, StepExecution stepExecution) {
|
||||
boolean continued = true;
|
||||
|
||||
continued = state != null && status!=FlowExecutionStatus.STOPPED;
|
||||
|
||||
if(stepExecution != null) {
|
||||
Boolean reRun = (Boolean) stepExecution.getExecutionContext().get("batch.restart");
|
||||
Boolean executed = (Boolean) stepExecution.getExecutionContext().get("batch.executed");
|
||||
|
||||
if((executed == null || !executed) && reRun != null && reRun && status == FlowExecutionStatus.STOPPED && !state.getName().endsWith(stepExecution.getStepName()) ) {
|
||||
continued = true;
|
||||
}
|
||||
}
|
||||
|
||||
return continued;
|
||||
}
|
||||
|
||||
private boolean stateNameEndsWithStepName(State state, StepExecution stepExecution) {
|
||||
return !(stepExecution == null || state == null) && !state.getName().endsWith(stepExecution.getStepName());
|
||||
}
|
||||
|
||||
private synchronized void initializeTransitionsIfNotInitialized() {
|
||||
if (startState == null) {
|
||||
initializeTransitions();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Analyse the transitions provided and generate all the information needed
|
||||
* to execute the flow.
|
||||
*/
|
||||
private void initializeTransitions() {
|
||||
startState = null;
|
||||
transitionMap.clear();
|
||||
stateMap.clear();
|
||||
boolean hasEndStep = false;
|
||||
|
||||
if (stateTransitions.isEmpty()) {
|
||||
throw new IllegalArgumentException("No start state was found. You must specify at least one step in a job.");
|
||||
}
|
||||
|
||||
for (StateTransition stateTransition : stateTransitions) {
|
||||
State state = stateTransition.getState();
|
||||
String stateName = state.getName();
|
||||
stateMap.put(stateName, state);
|
||||
}
|
||||
|
||||
for (StateTransition stateTransition : stateTransitions) {
|
||||
|
||||
State state = stateTransition.getState();
|
||||
|
||||
if (!stateTransition.isEnd()) {
|
||||
|
||||
String next = stateTransition.getNext();
|
||||
|
||||
if (!stateMap.containsKey(next)) {
|
||||
throw new IllegalArgumentException("Missing state for [" + stateTransition + "]");
|
||||
}
|
||||
|
||||
}
|
||||
else {
|
||||
hasEndStep = true;
|
||||
}
|
||||
|
||||
String name = state.getName();
|
||||
|
||||
Set<StateTransition> set = transitionMap.get(name);
|
||||
if (set == null) {
|
||||
// If no comparator is provided, we will maintain the order of insertion
|
||||
if(stateTransitionComparator == null) {
|
||||
set = new LinkedHashSet<>();
|
||||
} else {
|
||||
set = new TreeSet<>(stateTransitionComparator);
|
||||
}
|
||||
|
||||
transitionMap.put(name, set);
|
||||
}
|
||||
set.add(stateTransition);
|
||||
|
||||
}
|
||||
|
||||
if (!hasEndStep) {
|
||||
throw new IllegalArgumentException(
|
||||
"No end state was found. You must specify at least one transition with no next state.");
|
||||
}
|
||||
|
||||
startState = stateTransitions.get(0).getState();
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user