New Chronicle-Map

src/test/java/net/openhft/chronicle/map/AcquireGetUsingMain.java

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+/*
+ * Copyright 2014 Higher Frequency Trading http://www.higherfrequencytrading.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.openhft.chronicle.map;
+
+import net.openhft.lang.model.Byteable;
+import net.openhft.lang.model.DataValueClasses;
+import net.openhft.lang.model.constraints.MaxSize;
+
+import java.io.File;
+
+import static org.junit.Assert.fail;
+
+public class AcquireGetUsingMain {
+    public static void main(String[] args) throws Exception {
+        File file = new File(System.getProperty("java.io.tmpdir") + "/test1");
+        ChronicleMap<String, Data> theSharedMap = ChronicleMapBuilder.of(String.class, Data.class)
+                .create(file);
+        Data data = DataValueClasses.newDirectReference(Data.class);
+        String processType = "testkey";
+        if (theSharedMap.getUsing(processType, data) == null) {
+            System.out.println("Key " + processType + " does not exist, " + data);
+        } else {
+            System.out.println("Key " + processType + "  exists " + data);
+        }
+
+        // you can't have off heap objects, but you can an on heap object which proxy references off heap data.
+        // this reference is not usable until it references something concrete.
+        Data data2 = DataValueClasses.newDirectReference(Data.class);
+        String processType2 = "testkey2";
+        if (theSharedMap.getUsing(processType2, data2) == null) {
+            // should be unset given we don't set it.
+            System.out.println("Key " + processType2 + " does not exist, " + data2);
+            try {
+                data2.setMaxNumberOfProcessesAllowed(4);
+                fail("Expected a NPE because this data2 value hasn't set to anything because there was no key in the map.");
+            } catch (NullPointerException npe) {
+                // expected as there was not value to set the data2 to.
+            }
+        } else {
+            System.out.println("Key " + processType2 + "  exists " + data2);
+        }
+
+        String processType3 = "testkey3";
+        if (theSharedMap.getUsing(processType3, data) == null) {
+            // should be unset as this key is not present.
+            System.out.println("Key " + processType3 + " does not exist, " + data);
+        } else {
+            System.out.println("Key " + processType3 + "  exists " + data);
+        }
+
+        // populate with an entry, creating as required.
+        Data data3 = theSharedMap.acquireUsing(processType, data);
+        assert data3 == data;
+
+        System.out.println("getting " + ((Byteable) data).bytes());
+        data.setMaxNumberOfProcessesAllowed(3);
+        data.setTimeAt(0, 100);
+        data.setTimeAt(1, 111);
+        data.setTimeAt(2, 222);
+
+        // an on heap object exists when created as it doesn't use indirection to where the data is actually held.
+        Data data4 = DataValueClasses.newInstance(Data.class);
+
+        // put is not needed as we created something already.
+        // theSharedMap.put(processType, data);
+        System.out.println("1 " + data.getMaxNumberOfProcessesAllowed());
+        System.out.println("2 " + data.getTimeAt(1));
+    }
+
+    public static interface Data {
+        void setTimeAt(@MaxSize(8) int index, long time);
+
+        long getTimeAt(int index);
+
+        int getMaxNumberOfProcessesAllowed();
+
+        void setMaxNumberOfProcessesAllowed(int num);
+    }
+
+}