/// <reference path="google-apps-script.types.d.ts" />

declare namespace GoogleAppsScript {
    namespace Lock {
        /**
         * A representation of a mutual-exclusion lock.
         *
         * This class allows scripts to make sure that only one instance of the script is executing a
         * given section of code at a time. This is particularly useful for callbacks and triggers, where a
         * user action may cause changes to a shared resource and you want to ensure that aren't collisions.
         *
         * The following examples shows how to use a lock in a form submit handler.
         *
         *     // Generates a unique ticket number for every form submission.
         *     function onFormSubmit(e) {
         *       var targetCell = e.range.offset(0, e.range.getNumColumns(), 1, 1);
         *
         *       // Get a script lock, because we're about to modify a shared resource.
         *       var lock = LockService.getScriptLock();
         *       // Wait for up to 30 seconds for other processes to finish.
         *       lock.waitLock(30000);
         *
         *       var ticketNumber = Number(ScriptProperties.getProperty('lastTicketNumber')) + 1;
         *       ScriptProperties.setProperty('lastTicketNumber', ticketNumber);
         *
         *       // Release the lock so that other processes can continue.
         *       lock.releaseLock();
         *
         *       targetCell.setValue(ticketNumber);
         *     }
         *
         * lastTicketNumber
         * ScriptProperties
         */
        interface Lock {
            hasLock(): boolean;
            releaseLock(): void;
            tryLock(timeoutInMillis: Integer): boolean;
            waitLock(timeoutInMillis: Integer): void;
        }
        /**
         * Prevents concurrent access to sections of code. This can be useful when you have multiple users
         * or processes modifying a shared resource and want to prevent collisions.
         */
        interface LockService {
            getDocumentLock(): Lock;
            getScriptLock(): Lock;
            getUserLock(): Lock;
        }
    }
}

declare var LockService: GoogleAppsScript.Lock.LockService;