Below is a solution for the exercise.
static void exercise(AccumuloClient client) throws Exception { // create a table called "GothamPD". client.tableOperations().create("GothamPD"); // Create a "secretId" authorization & visibility final String secretId = "secretId"; Authorizations auths = new Authorizations(secretId); ColumnVisibility colVis = new ColumnVisibility(secretId); // Create a user with the "secretId" authorization and grant him read permissions on our table client.securityOperations().createLocalUser("commissioner", new PasswordToken("gordonrocks")); client.securityOperations().changeUserAuthorizations("commissioner", auths); client.securityOperations().grantTablePermission("commissioner", "GothamPD", TablePermission.READ); // Create 3 Mutation objects, securing the proper columns. Mutation mutation1 = new Mutation("id0001"); mutation1.put("hero", "alias", "Batman"); mutation1.put("hero", "name", colVis, "Bruce Wayne"); mutation1.put("hero", "wearsCape?", "true"); Mutation mutation2 = new Mutation("id0002"); mutation2.put("hero", "alias", "Robin"); mutation2.put("hero", "name", colVis, "Dick Grayson"); mutation2.put("hero", "wearsCape?", "true"); Mutation mutation3 = new Mutation("id0003"); mutation3.put("villain", "alias", "Joker"); mutation3.put("villain", "name", "Unknown"); mutation3.put("villain", "wearsCape?", "false"); // Create a BatchWriter to the GothamPD table and add your mutations to it. // Once the BatchWriter is closed by the try w/ resources, data will be available to scans. try (BatchWriter writer = client.createBatchWriter("GothamPD")) { writer.addMutation(mutation1); writer.addMutation(mutation2); writer.addMutation(mutation3); } // Create a second client for the commissioner. Then print all the rows visibile to the // commissioner. Make sure to pass the proper authorizations to the Scanner try (AccumuloClient commishClient = Accumulo.newClient().from(client.properties()) .as("commissioner", "gordonrocks").build(); Scanner scan = commishClient.createScanner("GothamPD", auths)) { System.out.println("Gotham Police Department Persons of Interest:"); for (Map.Entry<Key, Value> entry : scan) { System.out.printf("Key : %-60s Value : %s\n", entry.getKey(), entry.getValue()); } } }
The solution above will print (timestamp will differ):
Gotham Police Department Persons of Interest: Key : id0001 hero:alias [] 1511900180231 false Value : Batman Key : id0001 hero:name [secretId] 1511900180231 false Value : Bruce Wayne Key : id0001 hero:wearsCape? [] 1511900180231 false Value : true Key : id0002 hero:alias [] 1511900180231 false Value : Robin Key : id0002 hero:name [secretId] 1511900180231 false Value : Dick Grayson Key : id0002 hero:wearsCape? [] 1511900180231 false Value : true Key : id0003 villain:alias [] 1511900180231 false Value : Joker Key : id0003 villain:name [] 1511900180231 false Value : Unknown Key : id0003 villain:wearsCape? [] 1511900180231 false Value : false