Soft automatic schema reload

Now client keeps actual schema metadata and sends schemaId header to be
checked against current Tarantool schema version. If client version
mismatches DB version client does schema reloading in the background.

Client operation interface was reworked in scope of support not only
number identifiers for spaces and indexes but also their string names.

Closes: #7, #137

Author: nicktorwald

Diff for: README.md

@@ -122,6 +122,18 @@ makes possible for the client to configure a socket provider.
 * `ComposableAsyncOps` - return the operation result as a `CompletionStage`
 * `FireAndForgetOps` - returns the query ID
 
+Each operation that requires space or index to be executed, can work with 
+number ID as well as string name of a space or an index.
+Assume, we have `my_space` space with space ID `512` and its primary index
+`primary` with index ID `0`. Then, for instance, `select` operations can be
+performed as the following:
+
+```java
+client.syncOps().select(512, 0, Collections.singletonList(1), 0, 1, Iterator.EQ);
+// or using more convenient way
+client.syncOps().select("my_space", "primary", Collections.singletonList(1), 0, 1, Iterator.EQ);
+``` 
+
 Feel free to override any method of `TarantoolClientImpl`. For example, to hook
 all the results, you could override this:
 

Diff for: src/main/java/org/tarantool/AbstractTarantoolOps.java

@@ -1,62 +1,213 @@
 package org.tarantool;
 
+import static org.tarantool.AbstractTarantoolOps.ResolvableArgument.ofResolved;
+import static org.tarantool.AbstractTarantoolOps.ResolvableArgument.ofUnresolved;
 
-public abstract class AbstractTarantoolOps<Space, Tuple, Operation, Result>
-    implements TarantoolClientOps<Space, Tuple, Operation, Result> {
+import java.util.Objects;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+public abstract class AbstractTarantoolOps<Tuple, Operation, Result>
+    implements TarantoolClientOps<Tuple, Operation, Result> {
+
+    private final Function<Object, Object> defaultSpaceResolver = space -> resolveSpace((String) space);
 
     private Code callCode = Code.OLD_CALL;
 
-    protected abstract Result exec(Code code, Object... args);
+    protected Result exec(Code code, Object... args) {
+        return exec(code, ResolvableArgument.ofAllResolved(args));
+    }
+
+    protected abstract Result exec(Code code, ResolvableArgument... args);
+
+    protected abstract int resolveSpace(String space);
+
+    protected abstract int resolveSpaceIndex(String space, String index);
+
+    protected static class ResolvableArgument {
+
+        private final Object value;
+        private final Function<Object, Object> resolver;
+
+        private ResolvableArgument(Object value, Function<Object, Object> resolver) {
+            Objects.requireNonNull(value);
+            this.value = value;
+            this.resolver = resolver;
+        }
+
+        public static ResolvableArgument ofResolved(Object resolvedValue) {
+            return new ResolvableArgument(resolvedValue, null);
+        }
+
+        public static ResolvableArgument[] ofAllResolved(Object[] resolvedValue) {
+            return Stream.of(resolvedValue).map(ResolvableArgument::ofResolved).toArray(ResolvableArgument[]::new);
+        }
+
+        public static ResolvableArgument ofUnresolved(Object unresolvedValue, Function<Object, Object> resolver) {
+            return new ResolvableArgument(unresolvedValue, resolver);
+        }
+
+        public boolean isUnresolved() {
+            try {
+                return resolver != null && resolver.apply(value) == null;
+            } catch (Exception ignored) {
+                return true;
+            }
+        }
+
+        public Object getValue() {
+            return resolver != null ? resolver.apply(value) : value;
+        }
 
-    public Result select(Space space, Space index, Tuple key, int offset, int limit, Iterator iterator) {
+        @Override
+        public String toString() {
+            if (isUnresolved()) {
+                return "{unresolved: " + value + "}";
+            }
+            return value.toString();
+        }
+
+    }
+
+    @Override
+    public Result select(Integer space, Integer index, Tuple key, int offset, int limit, Iterator iterator) {
         return select(space, index, key, offset, limit, iterator.getValue());
     }
 
-    public Result select(Space space, Space index, Tuple key, int offset, int limit, int iterator) {
-        return exec(
-            Code.SELECT,
-            Key.SPACE, space,
-            Key.INDEX, index,
-            Key.KEY, key,
-            Key.ITERATOR, iterator,
-            Key.LIMIT, limit,
-            Key.OFFSET, offset
+    @Override
+    public Result select(String space, String index, Tuple key, int offset, int limit, Iterator iterator) {
+        return select(space, index, key, offset, limit, iterator.getValue());
+    }
+
+    @Override
+    public Result select(Integer space, Integer index, Tuple key, int offset, int limit, int iterator) {
+        return doSelect(ofResolved(space), ofResolved(index), key, offset, limit, iterator);
+    }
+
+    @Override
+    public Result select(String space, String index, Tuple key, int offset, int limit, int iterator) {
+        return doSelect(
+            ofUnresolved(space, defaultSpaceResolver),
+            ofUnresolved(index, indexName -> resolveSpaceIndex(space, (String) indexName)),
+            key, offset, limit, iterator
         );
     }
 
-    public Result insert(Space space, Tuple tuple) {
-        return exec(Code.INSERT, Key.SPACE, space, Key.TUPLE, tuple);
+    @Override
+    public Result insert(Integer space, Tuple tuple) {
+        return doInsert(ofResolved(space), tuple);
+    }
+
+    @Override
+    public Result insert(String space, Tuple tuple) {
+        return doInsert(ofUnresolved(space, defaultSpaceResolver), tuple);
+    }
+
+    @Override
+    public Result replace(Integer space, Tuple tuple) {
+        return doReplace(ofResolved(space), tuple);
+    }
+
+    @Override
+    public Result replace(String space, Tuple tuple) {
+        return doReplace(ofUnresolved(space, defaultSpaceResolver), tuple);
+    }
+
+    @Override
+    public Result update(Integer space, Tuple key, Operation... args) {
+        return doUpdate(ofResolved(space), key, args);
+    }
+
+    @Override
+    public Result update(String space, Tuple key, Operation... tuple) {
+        return doUpdate(ofUnresolved(space, defaultSpaceResolver), key, tuple);
     }
 
-    public Result replace(Space space, Tuple tuple) {
-        return exec(Code.REPLACE, Key.SPACE, space, Key.TUPLE, tuple);
+    @Override
+    public Result upsert(Integer space, Tuple key, Tuple defTuple, Operation... ops) {
+        return doUpsert(ofResolved(space), key, defTuple, ops);
     }
 
-    public Result update(Space space, Tuple key, Operation... args) {
-        return exec(Code.UPDATE, Key.SPACE, space, Key.KEY, key, Key.TUPLE, args);
+    @Override
+    public Result upsert(String space, Tuple key, Tuple defTuple, Operation... ops) {
+        return doUpsert(ofUnresolved(space, defaultSpaceResolver), key, defTuple, ops);
     }
 
-    public Result upsert(Space space, Tuple key, Tuple def, Operation... args) {
-        return exec(Code.UPSERT, Key.SPACE, space, Key.KEY, key, Key.TUPLE, def, Key.UPSERT_OPS, args);
+    @Override
+    public Result delete(Integer space, Tuple key) {
+        return doDelete(ofResolved(space), key);
     }
 
-    public Result delete(Space space, Tuple key) {
-        return exec(Code.DELETE, Key.SPACE, space, Key.KEY, key);
+    @Override
+    public Result delete(String space, Tuple key) {
+        return doDelete(ofUnresolved(space, defaultSpaceResolver), key);
     }
 
+    @Override
     public Result call(String function, Object... args) {
         return exec(callCode, Key.FUNCTION, function, Key.TUPLE, args);
     }
 
+    @Override
     public Result eval(String expression, Object... args) {
         return exec(Code.EVAL, Key.EXPRESSION, expression, Key.TUPLE, args);
     }
 
+    @Override
     public void ping() {
         exec(Code.PING);
     }
 
     public void setCallCode(Code callCode) {
         this.callCode = callCode;
     }
+
+    private Result doDelete(ResolvableArgument space, Tuple key) {
+        return exec(Code.DELETE, ofResolved(Key.SPACE), space, ofResolved(Key.KEY), ofResolved(key));
+    }
+
+    private Result doUpsert(ResolvableArgument space, Tuple key, Tuple defTuple, Operation... ops) {
+        return exec(
+            Code.UPSERT,
+            ofResolved(Key.SPACE), space,
+            ofResolved(Key.KEY), ofResolved(key),
+            ofResolved(Key.TUPLE), ofResolved(defTuple),
+            ofResolved(Key.UPSERT_OPS), ofResolved(ops)
+        );
+    }
+
+    private Result doUpdate(ResolvableArgument space, Tuple key, Operation... ops) {
+        return exec(
+            Code.UPDATE,
+            ofResolved(Key.SPACE), space,
+            ofResolved(Key.KEY), ofResolved(key),
+            ofResolved(Key.TUPLE), ofResolved(ops)
+        );
+    }
+
+    private Result doReplace(ResolvableArgument space, Tuple tuple) {
+        return exec(Code.REPLACE, ofResolved(Key.SPACE), space, ofResolved(Key.TUPLE), ofResolved(tuple));
+    }
+
+    private Result doInsert(ResolvableArgument space, Tuple tuple) {
+        return exec(Code.INSERT, ofResolved(Key.SPACE), space, ofResolved(Key.TUPLE), ofResolved(tuple));
+    }
+
+    private Result doSelect(ResolvableArgument space,
+                            ResolvableArgument index,
+                            Tuple key,
+                            int offset,
+                            int limit,
+                            int iterator) {
+        return exec(
+            Code.SELECT,
+            ofResolved(Key.SPACE), space,
+            ofResolved(Key.INDEX), index,
+            ofResolved(Key.KEY), ofResolved(key),
+            ofResolved(Key.ITERATOR), ofResolved(iterator),
+            ofResolved(Key.LIMIT), ofResolved(limit),
+            ofResolved(Key.OFFSET), ofResolved(offset)
+        );
+    }
+
 }

Diff for: src/main/java/org/tarantool/TarantoolBase.java

@@ -9,7 +9,7 @@
 import java.util.List;
 import java.util.concurrent.atomic.AtomicLong;
 
-public abstract class TarantoolBase<Result> extends AbstractTarantoolOps<Integer, List<?>, Object, Result> {
+public abstract class TarantoolBase<Result> extends AbstractTarantoolOps<List<?>, Object, Result> {
     protected String serverVersion;
     protected MsgPackLite msgPackLite = MsgPackLite.INSTANCE;
     protected AtomicLong syncId = new AtomicLong();
@@ -42,16 +42,6 @@ protected void closeChannel(SocketChannel channel) {
         }
     }
 
-    protected void validateArgs(Object[] args) {
-        if (args != null) {
-            for (int i = 0; i < args.length; i += 2) {
-                if (args[i + 1] == null) {
-                    throw new NullPointerException(((Key) args[i]).name() + " should not be null");
-                }
-            }
-        }
-    }
-
     public void setInitialRequestSize(int initialRequestSize) {
         this.initialRequestSize = initialRequestSize;
     }

Diff for: src/main/java/org/tarantool/TarantoolClient.java

@@ -7,13 +7,13 @@
 import java.util.concurrent.TimeUnit;
 
 public interface TarantoolClient {
-    TarantoolClientOps<Integer, List<?>, Object, List<?>> syncOps();
+    TarantoolClientOps<List<?>, Object, List<?>> syncOps();
 
-    TarantoolClientOps<Integer, List<?>, Object, Future<List<?>>> asyncOps();
+    TarantoolClientOps<List<?>, Object, Future<List<?>>> asyncOps();
 
-    TarantoolClientOps<Integer, List<?>, Object, CompletionStage<List<?>>> composableAsyncOps();
+    TarantoolClientOps<List<?>, Object, CompletionStage<List<?>>> composableAsyncOps();
 
-    TarantoolClientOps<Integer, List<?>, Object, Long> fireAndForgetOps();
+    TarantoolClientOps<List<?>, Object, Long> fireAndForgetOps();
 
     TarantoolSQLOps<Object, Long, List<Map<String, Object>>> sqlSyncOps();