SplitEachLine(',') { line -> int identification = line[0]. toInteger() double stability = line[1]. toDouble() accounts[id] = new Account(id:id,balance:balance) } nextId = accounts?. keySet(). max() ? : zero nextId++ soiled = fake } every one account is saved as undeniable textual content, with a comma keeping apart the identity from the stability. analyzing debts makes use of the splitEachLine procedure that takes arguments: the delimiter (a comma for that reason) and a closure that defines what to do with the ensuing record. The closure says to parse the identity and stability into the right kind facts varieties, instantiate an account with the ensuing values, and reserve it within the map. Then i must set the nextId variable to 1 greater than the max of the IDs used up to now, which supplies me a chance to exploit the cool Elvis operator. 10 ultimately, simply because this technique refreshes the cache, i will be able to set the soiled flag to fake. The corresponding way to write out the debts is proven subsequent: void writeAccountsToFile() { accountsFile. withWriter { w -> bills. every one { identification, account -> w. println("$id,$account. balance") } } soiled = actual } The withWriter technique is from the Groovy JDK and is further to the java. io. dossier category. It presents an output author wrapped round the dossier that closes immediately whilst the closure argument completes. The closure writes the identity and stability of every account to a unmarried line within the dossier, separated via a comma. simply because this technique adjustments the dossier, it units the soiled flag to actual in order that the category is familiar with the cache has to be refreshed. nine 10 That’s one other refined seize. The syntax for Java generics compiles in Groovy, yet simply because you declared a List doesn’t suggest you can’t upload circumstances of String, Date, or worker that allows you to. In Groovy, reflect on the widely used announcement as not anything greater than documentation. I don’t fairly exit of my method to locate excuses to exploit the cool Elvis operator, yet I don’t cross them up after they current themselves both. 148 bankruptcy 6 checking out Groovy and Java initiatives With these equipment in position, the following directory indicates the total DAO implementation. directory 6. 20 the full FileAccountDAO implementation, in Groovy type FileAccountDAO implements AccountDAO { def accountsFile Map bills = [:] deepest static int nextId boolean soiled inner most void readAccountsFromFile() { accountsFile. splitEachLine(',') { line -> int identification = line[0]. toInteger() double stability = line[1]. toDouble() accounts[id] = new Account(id:id,balance:balance) } nextId = accounts?. keySet(). max() ? : zero nextId++ soiled = fake } inner most void writeAccountsToFile() { accountsFile. withWriter { w -> money owed. each one { identification, account -> w. println("$id,$account. balance") } } soiled = real } @Override Account findAccountById(int identification) { if (dirty) readAccountsFromFile() go back accounts[id] } @Override Collection findAllAccounts() { if (dirty) readAccountsFromFile() go back money owed. values() } Refresh the cache if valuable @Override int createNewAccount(double stability) { int newId = nextId++ accounts[newId] = new Account(id:newId,balance:balance) writeAccountsToFile() go back newId; } @Override void deleteAccount(int identification) { money owed.