fix: getScheduledExecutions(...) should be able to return executions with unresolved tasks

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/ScheduledExecution.java

@@ -14,6 +14,7 @@
 package com.github.kagkarlsson.scheduler;
 
 import com.github.kagkarlsson.scheduler.exceptions.DataClassMismatchException;
+import com.github.kagkarlsson.scheduler.exceptions.MissingRawDataException;
 import com.github.kagkarlsson.scheduler.task.Execution;
 import com.github.kagkarlsson.scheduler.task.TaskInstanceId;
 import java.time.Instant;
@@ -47,6 +48,19 @@ public DATA_TYPE getData() {
     throw new DataClassMismatchException(dataClass, data.getClass());
   }
 
+  public boolean hasRawData() {
+    Object data = this.execution.taskInstance.getData();
+    return data == null || data.getClass().equals(byte[].class);
+  }
+
+  public byte[] getRawData() {
+    if (!hasRawData()) {
+      throw new MissingRawDataException(dataClass);
+    }
+
+    return (byte[]) this.execution.taskInstance.getData();
+  }
+
   public Instant getLastSuccess() {
     return execution.lastSuccess;
   }

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/ScheduledExecutionsFilter.java

@@ -18,19 +18,33 @@
 public class ScheduledExecutionsFilter {
 
   private Boolean pickedValue;
+  private boolean includeUnresolved = false;
 
   private ScheduledExecutionsFilter() {}
 
   public static ScheduledExecutionsFilter all() {
-    return new ScheduledExecutionsFilter();
+    return new ScheduledExecutionsFilter().withIncludeUnresolved(true);
+  }
+
+  public static ScheduledExecutionsFilter onlyResolved() {
+    return new ScheduledExecutionsFilter().withIncludeUnresolved(false);
   }
 
   public ScheduledExecutionsFilter withPicked(boolean pickedValue) {
     this.pickedValue = pickedValue;
     return this;
   }
 
+  public ScheduledExecutionsFilter withIncludeUnresolved(boolean includeUnresolved) {
+    this.includeUnresolved = includeUnresolved;
+    return this;
+  }
+
   public Optional<Boolean> getPickedValue() {
     return Optional.ofNullable(pickedValue);
   }
+
+  public boolean getIncludeUnresolved() {
+    return includeUnresolved;
+  }
 }

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/SchedulerClient.java

@@ -139,6 +139,15 @@ <T> void fetchScheduledExecutionsForTask(
       ScheduledExecutionsFilter filter,
       Consumer<ScheduledExecution<T>> consumer);
 
+  /**
+   * @see #fetchScheduledExecutionsForTask(String, Class, Consumer)
+   */
+  default <T> List<ScheduledExecution<Object>> getScheduledExecutionsForTask(String taskName) {
+    List<ScheduledExecution<Object>> executions = new ArrayList<>();
+    fetchScheduledExecutionsForTask(taskName, Object.class, executions::add);
+    return executions;
+  }
+
   /**
    * @see #fetchScheduledExecutionsForTask(String, Class, Consumer)
    */

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/TaskResolver.java

@@ -52,8 +52,12 @@ public TaskResolver(StatsRegistry statsRegistry, Clock clock, List<Task<?>> know
   }
 
   public Optional<Task> resolve(String taskName) {
+    return resolve(taskName, true);
+  }
+
+  public Optional<Task> resolve(String taskName, boolean addUnresolvedToExclusionFilter) {
     Task task = taskMap.get(taskName);
-    if (task == null) {
+    if (task == null && addUnresolvedToExclusionFilter) {
       addUnresolved(taskName);
       statsRegistry.register(StatsRegistry.SchedulerStatsEvent.UNRESOLVED_TASK);
       LOG.info(

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/exceptions/DataClassMismatchException.java

@@ -19,6 +19,10 @@ public class DataClassMismatchException extends DbSchedulerException {
   public DataClassMismatchException(Class expectedClass, Class actualClass) {
     super(
         String.format(
-            "Task data mismatch. Expected class : %s, actual : %s", expectedClass, actualClass));
+            "Task data mismatch. If actual data-class is byte[], it might have been fetched without"
+                + " knowledge of task-data types, and is thus not deserialized."
+                + " Use getRawData() to get non-deserialized data in that case."
+                + " Expected class : %s, actual : %s",
+            expectedClass, actualClass));
   }
 }

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/exceptions/MissingRawDataException.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) Gustav Karlsson
+ *
+ * <p>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
+ *
+ * <p>http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * <p>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 com.github.kagkarlsson.scheduler.exceptions;
+
+public class MissingRawDataException extends DbSchedulerException {
+  private static final long serialVersionUID = 1L;
+
+  public MissingRawDataException(Class<?> dataClass) {
+    super(
+        String.format(
+            "Scheduled execution has typed data, use getData() to read the deserialized object. Data-class : %s",
+            dataClass));
+  }
+}

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/jdbc/JdbcTaskRepository.java

@@ -21,11 +21,7 @@
 import com.github.kagkarlsson.jdbc.JdbcRunner;
 import com.github.kagkarlsson.jdbc.ResultSetMapper;
 import com.github.kagkarlsson.jdbc.SQLRuntimeException;
-import com.github.kagkarlsson.scheduler.Clock;
-import com.github.kagkarlsson.scheduler.ScheduledExecutionsFilter;
-import com.github.kagkarlsson.scheduler.SchedulerName;
-import com.github.kagkarlsson.scheduler.TaskRepository;
-import com.github.kagkarlsson.scheduler.TaskResolver;
+import com.github.kagkarlsson.scheduler.*;
 import com.github.kagkarlsson.scheduler.TaskResolver.UnresolvedTask;
 import com.github.kagkarlsson.scheduler.exceptions.ExecutionException;
 import com.github.kagkarlsson.scheduler.exceptions.TaskInstanceException;
@@ -244,22 +240,31 @@ public void getScheduledExecutions(
     UnresolvedFilter unresolvedFilter = new UnresolvedFilter(taskResolver.getUnresolved());
 
     QueryBuilder q = queryForFilter(filter);
-    if (unresolvedFilter.isActive()) {
+    if (unresolvedFilter.isActive() && !filter.getIncludeUnresolved()) {
       q.andCondition(unresolvedFilter);
     }
 
     jdbcRunner.query(
-        q.getQuery(), q.getPreparedStatementSetter(), new ExecutionResultSetConsumer(consumer));
+        q.getQuery(),
+        q.getPreparedStatementSetter(),
+        new ExecutionResultSetConsumer(consumer, filter.getIncludeUnresolved(), false));
   }
 
   @Override
   public void getScheduledExecutions(
       ScheduledExecutionsFilter filter, String taskName, Consumer<Execution> consumer) {
+    UnresolvedFilter unresolvedFilter = new UnresolvedFilter(taskResolver.getUnresolved());
+
     QueryBuilder q = queryForFilter(filter);
+    if (unresolvedFilter.isActive() && !filter.getIncludeUnresolved()) {
+      q.andCondition(unresolvedFilter);
+    }
     q.andCondition(new TaskCondition(taskName));
 
     jdbcRunner.query(
-        q.getQuery(), q.getPreparedStatementSetter(), new ExecutionResultSetConsumer(consumer));
+        q.getQuery(),
+        q.getPreparedStatementSetter(),
+        new ExecutionResultSetConsumer(consumer, filter.getIncludeUnresolved(), false));
   }
 
   @Override
@@ -285,7 +290,7 @@ public List<Execution> getDue(Instant now, int limit) {
             p.setMaxRows(limit);
           }
         },
-        new ExecutionResultSetMapper());
+        new ExecutionResultSetMapper(false, true));
   }
 
   @Override
@@ -377,6 +382,7 @@ private boolean rescheduleInternal(
               jdbcCustomization.setInstant(ps, index++, nextExecutionTime);
               if (newData != null) {
                 // may cause datbase-specific problems, might have to use setNull instead
+                // FIXLATER: optionally support bypassing serializer if byte[] already
                 ps.setObject(index++, serializer.serialize(newData.data));
               }
               ps.setString(index++, execution.taskInstance.getTaskName());
@@ -449,7 +455,7 @@ public List<Execution> getDeadExecutions(Instant olderThan) {
           jdbcCustomization.setInstant(p, index++, olderThan);
           unresolvedFilter.setParameters(p, index);
         },
-        new ExecutionResultSetMapper());
+        new ExecutionResultSetMapper(false, true));
   }
 
   @Override
@@ -497,7 +503,7 @@ public List<Execution> getExecutionsFailingLongerThan(Duration interval) {
           jdbcCustomization.setInstant(p, index++, Instant.now().minus(interval));
           unresolvedFilter.setParameters(p, index);
         },
-        new ExecutionResultSetMapper());
+        new ExecutionResultSetMapper(false, false));
   }
 
   public Optional<Execution> getExecution(TaskInstance taskInstance) {
@@ -512,7 +518,7 @@ public Optional<Execution> getExecution(String taskName, String taskInstanceId)
               p.setString(1, taskName);
               p.setString(2, taskInstanceId);
             },
-            new ExecutionResultSetMapper());
+            new ExecutionResultSetMapper(true, false));
     if (executions.size() > 1) {
       throw new TaskInstanceException(
           "Found more than one matching execution for task name/id combination.",
@@ -544,7 +550,11 @@ public void checkSupportsLockAndFetch() {
 
   private JdbcTaskRepositoryContext getTaskRespositoryContext() {
     return new JdbcTaskRepositoryContext(
-        taskResolver, tableName, schedulerSchedulerName, jdbcRunner, ExecutionResultSetMapper::new);
+        taskResolver,
+        tableName,
+        schedulerSchedulerName,
+        jdbcRunner,
+        () -> new ExecutionResultSetMapper(false, true));
   }
 
   private QueryBuilder queryForFilter(ScheduledExecutionsFilter filter) {
@@ -567,9 +577,12 @@ private class ExecutionResultSetMapper implements ResultSetMapper<List<Execution
 
     private final ExecutionResultSetConsumer delegate;
 
-    private ExecutionResultSetMapper() {
+    private ExecutionResultSetMapper(
+        boolean includeUnresolved, boolean addUnresolvedToExclusionFilter) {
       this.executions = new ArrayList<>();
-      this.delegate = new ExecutionResultSetConsumer(executions::add);
+      this.delegate =
+          new ExecutionResultSetConsumer(
+              executions::add, includeUnresolved, addUnresolvedToExclusionFilter);
     }
 
     @Override
@@ -583,22 +596,37 @@ public List<Execution> map(ResultSet resultSet) throws SQLException {
   private class ExecutionResultSetConsumer implements ResultSetMapper<Void> {
 
     private final Consumer<Execution> consumer;
+    private final boolean includeUnresolved;
+    private boolean addUnresolvedToExclusionFilter;
 
     private ExecutionResultSetConsumer(Consumer<Execution> consumer) {
+      this(consumer, false, true);
+    }
+
+    private ExecutionResultSetConsumer(
+        Consumer<Execution> consumer,
+        boolean includeUnresolved,
+        boolean addUnresolvedToExclusionFilter) {
       this.consumer = consumer;
+      this.includeUnresolved = includeUnresolved;
+      this.addUnresolvedToExclusionFilter = addUnresolvedToExclusionFilter;
     }
 
     @Override
     public Void map(ResultSet rs) throws SQLException {
 
       while (rs.next()) {
         String taskName = rs.getString("task_name");
-        Optional<Task> task = taskResolver.resolve(taskName);
-
-        if (!task.isPresent()) {
-          LOG.warn(
-              "Failed to find implementation for task with name '{}'. Execution will be excluded from due. Either delete the execution from the database, or add an implementation for it. The scheduler may be configured to automatically delete unresolved tasks after a certain period of time.",
-              taskName);
+        Optional<Task> task = taskResolver.resolve(taskName, addUnresolvedToExclusionFilter);
+
+        if (!task.isPresent() && !includeUnresolved) {
+          if (addUnresolvedToExclusionFilter) {
+            LOG.warn(
+                "Failed to find implementation for task with name '{}'. Execution will be excluded from due. "
+                    + "The scheduler normally delete unresolved tasks after 14d. To handle manually, "
+                    + "either delete the execution from the database, or add an implementation for it. ",
+                taskName);
+          }
           continue;
         }
 
@@ -618,7 +646,15 @@ public Void map(ResultSet rs) throws SQLException {
         long version = rs.getLong("version");
 
         Supplier dataSupplier =
-            memoize(() -> serializer.deserialize(task.get().getDataClass(), data));
+            memoize(
+                () -> {
+                  if (!task.isPresent()) {
+                    // return the data raw if the type is not known
+                    //  a case for standalone clients, with no "known tasks"
+                    return data;
+                  }
+                  return serializer.deserialize(task.get().getDataClass(), data);
+                });
         this.consumer.accept(
             new Execution(
                 executionTime,
@@ -638,7 +674,6 @@ public Void map(ResultSet rs) throws SQLException {
 
   private static <T> Supplier<T> memoize(Supplier<T> original) {
     return new Supplier<T>() {
-      Supplier<T> delegate = this::firstTime;
       boolean initialized;
 
       public T get() {
@@ -653,6 +688,8 @@ private synchronized T firstTime() {
         }
         return delegate.get();
       }
+
+      Supplier<T> delegate = this::firstTime;
     };
   }
 

db-scheduler/src/test/java/com/github/kagkarlsson/scheduler/JdbcTaskRepositoryTest.java

@@ -1,6 +1,7 @@
 package com.github.kagkarlsson.scheduler;
 
 import static com.github.kagkarlsson.scheduler.ScheduledExecutionsFilter.all;
+import static com.github.kagkarlsson.scheduler.ScheduledExecutionsFilter.onlyResolved;
 import static com.github.kagkarlsson.scheduler.jdbc.JdbcTaskRepository.DEFAULT_TABLE_NAME;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.empty;
@@ -402,15 +403,19 @@ public void get_dead_executions_should_not_include_previously_unresolved() {
   @Test
   public void get_scheduled_executions_should_work_with_unresolved() {
     Instant now = TimeHelper.truncatedInstantNow();
+    String taskName = "unresolved1";
     final OneTimeTask<Void> unresolved1 =
-        TestTasks.oneTime("unresolved1", Void.class, TestTasks.DO_NOTHING);
+        TestTasks.oneTime(taskName, Void.class, TestTasks.DO_NOTHING);
     taskRepository.createIfNotExists(
         new SchedulableTaskInstance<>(unresolved1.instance("id"), now));
     assertThat(taskRepository.getDue(now, POLLING_LIMIT), hasSize(0));
     assertThat(taskResolver.getUnresolved(), hasSize(1));
 
-    taskRepository.getScheduledExecutions(ScheduledExecutionsFilter.all(), e -> {});
-    taskRepository.getScheduledExecutions(ScheduledExecutionsFilter.all(), "sometask", e -> {});
+    assertThat(getScheduledExecutions(ScheduledExecutionsFilter.onlyResolved()), hasSize(0));
+    assertThat(
+        getScheduledExecutions(ScheduledExecutionsFilter.onlyResolved(), taskName), hasSize(0));
+    assertThat(getScheduledExecutions(all()), hasSize(1));
+    assertThat(getScheduledExecutions(all(), taskName), hasSize(1));
   }
 
   @Test
@@ -459,7 +464,7 @@ private Execution getSingleDueExecution() {
 
   private Execution getSingleExecution() {
     List<Execution> executions = new ArrayList<>();
-    taskRepository.getScheduledExecutions(all().withPicked(false), executions::add);
+    taskRepository.getScheduledExecutions(onlyResolved().withPicked(false), executions::add);
     return executions.get(0);
   }
 }

db-scheduler/src/test/java/com/github/kagkarlsson/scheduler/ScheduledExecutionTest.java

@@ -1,5 +1,6 @@
 package com.github.kagkarlsson.scheduler;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
@@ -8,6 +9,7 @@
 import com.github.kagkarlsson.scheduler.task.Execution;
 import com.github.kagkarlsson.scheduler.task.helper.OneTimeTask;
 import java.time.Instant;
+import org.hamcrest.CoreMatchers;
 import org.junit.jupiter.api.Test;
 
 public class ScheduledExecutionTest {
@@ -59,8 +61,7 @@ public void test_data_class_type_not_equals() {
                   .getData(); // Instantiate with incorrect type
             });
 
-    assertEquals(
-        "Task data mismatch. Expected class : class java.lang.String, actual : class java.lang.Integer",
-        dataClassMismatchException.getMessage());
+    assertThat(
+        dataClassMismatchException.getMessage(), CoreMatchers.containsString("Task data mismatch"));
   }
 }