| 1 | package net.spy.memcached.ops; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.Collection; |
| 5 | |
| 6 | import net.spy.memcached.OperationFactory; |
| 7 | |
| 8 | /** |
| 9 | * Base class for operation factories. |
| 10 | * |
| 11 | * <p> |
| 12 | * There is little common code between OperationFactory implementations, but |
| 13 | * some exists, and is complicated and likely to cause problems. |
| 14 | * </p> |
| 15 | */ |
| 16 | public abstract class BaseOperationFactory implements OperationFactory { |
| 17 | |
| 18 | private String first(Collection<String> keys) { |
| 19 | return keys.iterator().next(); |
| 20 | } |
| 21 | |
| 22 | public Collection<Operation> clone(KeyedOperation op) { |
| 23 | assert op.getState() == OperationState.WRITING |
| 24 | : "Who passed me an operation in the " + op.getState() + "state?"; |
| 25 | assert !op.isCancelled() : "Attempted to clone a canceled op"; |
| 26 | assert !op.hasErrored() : "Attempted to clone an errored op"; |
| 27 | |
| 28 | Collection<Operation> rv = new ArrayList<Operation>( |
| 29 | op.getKeys().size()); |
| 30 | if(op instanceof GetOperation) { |
| 31 | rv.addAll(cloneGet(op)); |
| 32 | } else if(op instanceof GetsOperation) { |
| 33 | GetsOperation.Callback callback = |
| 34 | (GetsOperation.Callback)op.getCallback(); |
| 35 | for(String k : op.getKeys()) { |
| 36 | rv.add(gets(k, callback)); |
| 37 | } |
| 38 | } else if(op instanceof CASOperation) { |
| 39 | CASOperation cop = (CASOperation)op; |
| 40 | rv.add(cas(cop.getStoreType(), first(op.getKeys()), |
| 41 | cop.getCasValue(), cop.getFlags(), cop.getExpiration(), |
| 42 | cop.getBytes(), cop.getCallback())); |
| 43 | } else if(op instanceof DeleteOperation) { |
| 44 | rv.add(delete(first(op.getKeys()), op.getCallback())); |
| 45 | } else if(op instanceof MutatorOperation) { |
| 46 | MutatorOperation mo = (MutatorOperation)op; |
| 47 | rv.add(mutate(mo.getType(), first(op.getKeys()), |
| 48 | mo.getBy(), mo.getDefault(), mo.getExpiration(), |
| 49 | op.getCallback())); |
| 50 | } else if(op instanceof StoreOperation) { |
| 51 | StoreOperation so = (StoreOperation)op; |
| 52 | rv.add(store(so.getStoreType(), first(op.getKeys()), so.getFlags(), |
| 53 | so.getExpiration(), so.getData(), op.getCallback())); |
| 54 | } else if(op instanceof ConcatenationOperation) { |
| 55 | ConcatenationOperation c = (ConcatenationOperation)op; |
| 56 | rv.add(cat(c.getStoreType(), c.getCasValue(), first(op.getKeys()), |
| 57 | c.getData(), c.getCallback())); |
| 58 | } else { |
| 59 | assert false : "Unhandled operation type: " + op.getClass(); |
| 60 | } |
| 61 | |
| 62 | return rv; |
| 63 | } |
| 64 | |
| 65 | protected abstract Collection<? extends Operation> cloneGet( |
| 66 | KeyedOperation op); |
| 67 | |
| 68 | } |