diff --git a/src/putility/src/features/PropertiesFeature.js b/src/putility/src/features/PropertiesFeature.js
index 56e27db6..53a8a207 100644
--- a/src/putility/src/features/PropertiesFeature.js
+++ b/src/putility/src/features/PropertiesFeature.js
@@ -19,7 +19,7 @@
 module.exports = {
     name: 'Properties',
     depends: ['Listeners'],
-    install_in_instance: (instance) => {
+    install_in_instance: (instance, { parameters }) => {
         const properties = instance._get_merged_static_object('PROPERTIES');
 
         instance.onchange = (name, callback) => {
@@ -39,6 +39,9 @@ module.exports = {
             let spec = null;
             if ( typeof properties[k] === 'object' ) {
                 spec = properties[k];
+                if ( spec.factory ) {
+                    spec.value = spec.factory({ parameters });
+                }
             } else if ( typeof properties[k] === 'function' ) {
                 spec = {};
                 spec.value = properties[k]();
@@ -59,9 +62,14 @@ module.exports = {
                         });
                     }
                     const old_value = instance[k];
+                    const intermediate_value = value;
+                    if ( spec.adapt ) {
+                        value = spec.adapt(value);
+                    }
                     state.value = value;
                     if ( spec.post_set ) {
                         spec.post_set.call(instance, value, {
+                            intermediate_value,
                             old_value,
                         });
                     }
@@ -69,6 +77,13 @@ module.exports = {
             });
 
             state.value = spec.value;
+
+            if ( properties[k].construct ) {
+                const k_cons = typeof properties[k].construct === 'string'
+                    ? properties[k].construct
+                    : k;
+                instance[k] = parameters[k_cons];
+            }
         }
     }
 }
diff --git a/src/putility/src/libs/log.js b/src/putility/src/libs/log.js
new file mode 100644
index 00000000..8406f54b
--- /dev/null
+++ b/src/putility/src/libs/log.js
@@ -0,0 +1,142 @@
+const { AdvancedBase } = require("../..");
+const { TLogger } = require("../traits/traits");
+
+class ArrayLogger extends AdvancedBase {
+    static PROPERTIES = {
+        buffer: {
+            factory: () => []
+        }
+    }
+    static IMPLEMENTS = {
+        [TLogger]: {
+            log (level, message, fields, values) {
+                this.buffer.push({ level, message, fields, values });
+            }
+        }
+    }
+}
+
+class ConsoleLogger extends AdvancedBase {
+    static MODULES = {
+        util: require('util'),
+    }
+    static PROPERTIES = {
+        console: {
+            construct: true,
+            factory: () => console
+        },
+        format: () => ({
+            info: {
+                ansii: '\x1b[32;1m',
+            },
+            warn: {
+                ansii: '\x1b[33;1m',
+            },
+            error: {
+                ansii: '\x1b[31;1m',
+                err: true,
+            },
+            debug: {
+                ansii: '\x1b[34;1m',
+            },
+        }),
+    }
+    static IMPLEMENTS = {
+        [TLogger]: {
+            log (level, message, fields, values) {
+                const require = this.require;
+                const util = require('util');
+                const l = this.format[level];
+                let str = '';
+                str += `${l.ansii}[${level.toUpperCase()}]\x1b[0m `;
+                str += message;
+
+                // values
+                if (values.length) {
+                    str += ' ';
+                    str += values
+                        .map(v => util.inspect(v))
+                        .join(' ');
+                }
+
+                // fields
+                if (Object.keys(fields).length) {
+                    str += ' ';
+                    str += Object.entries(fields)
+                        .map(([k, v]) => `\n  ${k}=${util.inspect(v)}`)
+                        .join(' ');
+                }
+
+                this.console[l.err ? 'error' : 'log'](str);
+            }
+        }
+    }
+}
+
+class FieldsLogger extends AdvancedBase {
+    static PROPERTIES = {
+        fields: {
+            construct: true,
+            factory: () => ({})
+        },
+        delegate: {
+            construct: true,
+            value: null
+        }
+    }
+
+    static IMPLEMENTS = {
+        [TLogger]: {
+            log (level, message, fields, values) {
+                return this.delegate.log(
+                    level, message,
+                    Object.assign({}, this.fields, fields),
+                    values,
+                );
+            }
+        }
+    }
+}
+
+class LoggerFacade extends AdvancedBase {
+    static PROPERTIES = {
+        impl: {
+            value: () => {
+                return new ConsoleLogger();
+            },
+            adapt: v => {
+                return v.as(TLogger);
+            },
+            construct: true,
+        },
+    }
+
+    static IMPLEMENTS = {
+        [TLogger]: {
+            log (level, message, fields, values) {
+                console.log()
+            }
+        }
+    }
+
+    fields (fields) {
+        const new_delegate = new FieldsLogger({
+            fields,
+            delegate: this.impl,
+        });
+        return new LoggerFacade({
+            impl: new_delegate,
+        });
+    }
+
+    info (message, ...values) {
+        this.impl.log('info', message, {}, values);
+    }
+}
+
+module.exports = {
+    ArrayLogger,
+    ConsoleLogger,
+    FieldsLogger,
+    LoggerFacade,
+};
diff --git a/src/putility/src/traits/traits.js b/src/putility/src/traits/traits.js
index 2416e6d3..03654fb7 100644
--- a/src/putility/src/traits/traits.js
+++ b/src/putility/src/traits/traits.js
@@ -1,4 +1,5 @@
 module.exports = {
     TTopics: Symbol('TTopics'),
     TDetachable: Symbol('TDetachable'),
+    TLogger: Symbol('TLogger'),
 };
diff --git a/src/putility/test/log.test.js b/src/putility/test/log.test.js
new file mode 100644
index 00000000..18a04546
--- /dev/null
+++ b/src/putility/test/log.test.js
@@ -0,0 +1,48 @@
+const { LoggerFacade, ArrayLogger, ConsoleLogger } = require("../src/libs/log");
+const { expect } = require('chai');
+
+describe('log', () => {
+    it('facade logger', () => {
+        const array_logger = new ArrayLogger();
+
+        let logger = new LoggerFacade({
+            impl: array_logger,
+        });
+
+        logger.info('test message only');
+        logger.info('test message and values', 1, 2);
+        logger = logger.fields({ a: 1 });
+        logger.info('test fields', 3, 4);
+
+        const logs = array_logger.buffer;
+        expect(logs).to.have.length(3);
+
+        expect(logs[0].level).to.equal('info');
+        expect(logs[0].message).to.equal('test message only');
+        expect(logs[0].fields).to.eql({});
+        expect(logs[0].values).to.eql([]);
+
+        expect(logs[1].level).to.equal('info');
+        expect(logs[1].message).to.equal('test message and values');
+        expect(logs[1].fields).to.eql({});
+        expect(logs[1].values).to.eql([1, 2]);
+
+        expect(logs[2].level).to.equal('info');
+        expect(logs[2].message).to.equal('test fields');
+        expect(logs[2].fields).to.eql({ a: 1 });
+        expect(logs[2].values).to.eql([3, 4]);
+    });
+    it('console logger', () => {
+        let logger = new ConsoleLogger({
+            console: console,
+        });
+        logger = new LoggerFacade({
+            impl: logger,
+        });
+
+        logger.fields({
+            token: 'asdf',
+            user: 'joe',
+        }).info('Hello, world!', 'v1', 'v2', { a: 1 });
+    });
+});