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Add support for the Saga pattern by enabling multiple actions in a transaction #11

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Add support for the Saga pattern by enabling multiple actions in a transaction #11

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19 changes: 14 additions & 5 deletions src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ const applyCommit = (state, commitId, reducer) => {
// If the action to commit is the first in the queue (most common scenario)
if (history.first().meta.optimistic.id === commitId) {
const historyWithoutCommit = history.shift();
const nextOptimisticIndex = historyWithoutCommit.findIndex(action => action.meta && action.meta.optimistic && action.meta.optimistic.id);
const nextOptimisticIndex = historyWithoutCommit.findIndex(action => action.meta && action.meta.optimistic && action.meta.optimistic.type === BEGIN);
// If this is the only optimistic item in the queue, we're done!
if (nextOptimisticIndex === -1) {
return state.withMutations(mutState => {
Expand Down Expand Up @@ -60,13 +60,16 @@ const applyRevert = (state, revertId, reducer) => {
// If the action to revert is the first in the queue (most common scenario)
if (history.first().meta.optimistic.id === revertId) {
const historyWithoutRevert = history.shift();
const nextOptimisticIndex = historyWithoutRevert.findIndex(action => action.meta && action.meta.optimistic && action.meta.optimistic.id);
const nextOptimisticIndex = historyWithoutRevert.findIndex(action => action.meta && action.meta.optimistic && action.meta.optimistic.type === BEGIN);
// If this is the only optimistic action in the queue, we're done!
if (nextOptimisticIndex === -1) {
return state.withMutations(mutState => {
mutState
.set('history', List())
.set('current', historyWithoutRevert.reduce((mutState, action) => reducer(mutState, action), beforeState))
.set('current', historyWithoutRevert
.filter(action => (action.meta && action.meta.optimistic && action.meta.optimistic.id != revertId) ||
(!action.meta || !action.meta.optimistic || !action.meta.optimistic.id))
.reduce((mutState, action) => reducer(mutState, action), beforeState))
.set('beforeState', undefined)
});
}
Expand All @@ -76,16 +79,22 @@ const applyRevert = (state, revertId, reducer) => {
if (indexToRevert === -1) {
console.error(`@@optimist: Failed revert. Transaction #${revertId} does not exist!`);
}
newHistory = history.delete(indexToRevert);
newHistory = history.filter(action => (action.meta && action.meta.optimistic && action.meta.optimistic.id != revertId) ||
(!action.meta || !action.meta.optimistic || !action.meta.optimistic.id))
}
const newCurrent = newHistory.reduce((mutState, action) => {
return reducer(mutState, action)
}, beforeState);
const firstBegin = newHistory.findIndex(action => action.meta && action.meta.optimistic && action.meta.optimistic.type === BEGIN)
const newBeforeState = newHistory.slice(0, firstBegin).reduce((mutState, action) => {
return reducer(mutState, action)
}, beforeState)
newHistory = newHistory.slice(firstBegin)
return state.withMutations(mutState => {
mutState
.set('history', newHistory)
.set('current', newCurrent)
.set('beforeState', beforeState)
.set('beforeState', newBeforeState)
});
};

Expand Down